texlive[55363] Master: semantex (31may20)

[commits+karl at tug.org]

Revision: 55363
          http://tug.org/svn/texlive?view=revision&revision=55363
Author:   karl
Date:     2020-05-31 23:11:43 +0200 (Sun, 31 May 2020)
Log Message:
-----------
semantex (31may20)

Modified Paths:
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    trunk/Master/tlpkg/bin/tlpkg-ctan-check
    trunk/Master/tlpkg/tlpsrc/collection-latexextra.tlpsrc

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    trunk/Master/texmf-dist/doc/latex/semantex/
    trunk/Master/texmf-dist/doc/latex/semantex/README.md
    trunk/Master/texmf-dist/doc/latex/semantex/semantex.pdf
    trunk/Master/texmf-dist/doc/latex/semantex/semantex.tex
    trunk/Master/texmf-dist/tex/latex/semantex/
    trunk/Master/texmf-dist/tex/latex/semantex/semantex.sty
    trunk/Master/tlpkg/tlpsrc/semantex.tlpsrc

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+SemanTeX - object-oriented mathematics
+--------------------------------------
+
+The SemanTeX package for LaTeX delivers a more semantic, systematized way of writing mathematics compared to the ordinary math syntax. The system is
+object-oriented and uses keyval syntax, and everything is highly
+customizable. At the same time, care has been taken to make it
+intuitive, natural, practical, and with an easy-to-use and lightweight
+syntax.
+
+----------------------------------------------------------------
+SemanTeX --- object-oriented mathematics
+Maintained by Sebastian Ørsted
+E-mail: sorsted at gmail.com
+Released under the LaTeX Project Public License v1.3c or later
+See http://www.latex-project.org/lppl.txt
+----------------------------------------------------------------
+
+Copyright (C) 2020 by Sebastian Ørsted <sorsted at gmail.com>
+
+The package is loaded via \usepackage{semantex}
+
+This work may be distributed and/or modified under the
+conditions of the LaTeX Project Public License (LPPL), either
+version 1.3c of this license or (at your option) any later
+version.  The latest version of this license is in the file:
+
+http://www.latex-project.org/lppl.txt
+
+This work is "maintained" (as per LPPL maintenance status) by
+Sebastian Ørsted.
\ No newline at end of file


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+\documentclass[a4paper,article,oneside,english,10pt]{memoir}
+
+\makeatletter
+
+\usepackage[utf8]{inputenc}
+\usepackage[T1]{fontenc}
+\usepackage{babel}
+\usepackage[noDcommand,slantedGreeks]{kpfonts}
+
+\frenchspacing
+
+\usepackage{mathtools,etoolbox,	microtype,xspace}
+
+
+
+\usepackage[shortlabels]{enumitem}%control lists
+
+\usepackage[draft]{fixme}
+
+%Setup of memoir:
+\pagestyle{plain} %change to heading for running headings
+\nouppercaseheads %running heads should not be capitalized
+\captionnamefont{\small} %captions with small font
+\captiontitlefont{\small}
+\makeevenhead{headings}{\thepage}{}{\itshape\leftmark} %make headings italic instead of slanted (though we do not use headings right now)
+\makeoddhead{headings}{\itshape\rightmark}{}{\thepage}
+
+\raggedbottomsectiontrue%less harse than \raggedbottom
+%\allowdisplaybreaks %long equations may break
+
+\g at addto@macro\bfseries{\boldmath} %make math in bold text automatically bold
+
+\usepackage[english=american]{csquotes}
+
+\usepackage[hidelinks]{hyperref}
+	
+\usepackage[nameinlink]{cleveref}
+
+\title{Seman\!\TeX: Object-oriented mathematics (v$0.1\alpha$)}
+\date{\today}
+\author{Sebastian Ørsted (\href{mailto:sorsted at gmail.com}{sorsted at gmail.com})}
+
+\hypersetup{
+	pdfauthor={Sebastian Ørsted},
+	pdftitle={SemanTeX: Object-oriented mathematics},
+	%pdfsubject={},
+	%pdfkeywords={},
+	%pdfproducer={Latex with hyperref, or other system},
+	%pdfcreator={pdflatex, or other tool},
+}
+
+
+
+
+% Settup up SemanTeX:
+
+\usepackage{semantex}
+
+\newvariableclass{var}[
+	output=var,
+]
+
+\newvar\va{a}
+\newvar\vb{b}
+\newvar\vc{c}
+\newvar\vd{d}
+\newvar\ve{e}
+\newvar\vf{f}
+\newvar\vg{g}
+\newvar\vh{h}
+\newvar\vi{i}
+\newvar\vj{j}
+\newvar\vk{k}
+\newvar\vl{l}
+\newvar\vm{m}
+\newvar\vn{n}
+\newvar\vo{o}
+\newvar\vp{p}
+\newvar\vq{q}
+\newvar\vr{r}
+\newvar\vs{s}
+\newvar\vt{t}
+\newvar\vu{u}
+\newvar\vv{v}
+\newvar\vw{w}
+\newvar\vx{x}
+\newvar\vy{y}
+\newvar\vz{z}
+
+\newvar\vA{A}
+\newvar\vB{B}
+\newvar\vC{C}
+\newvar\vD{D}
+\newvar\vE{E}
+\newvar\vF{F}
+\newvar\vG{G}
+\newvar\vH{H}
+\newvar\vI{I}
+\newvar\vJ{J}
+\newvar\vK{K}
+\newvar\vL{L}
+\newvar\vM{M}
+\newvar\vN{N}
+\newvar\vO{O}
+\newvar\vP{P}
+\newvar\vQ{Q}
+\newvar\vR{R}
+\newvar\vS{S}
+\newvar\vT{T}
+\newvar\vU{U}
+\newvar\vV{V}
+\newvar\vW{W}
+\newvar\vX{X}
+\newvar\vY{Y}
+\newvar\vZ{Z}
+
+\newvar\valpha{\alpha}
+\newvar\vvaralpha{\varalpha}
+\newvar\vbeta{\beta}
+\newvar\vgamma{\gamma}
+\newvar\vdelta{\delta}
+\newvar\vepsilon{\epsilon}
+\newvar\vvarepsilon{\varepsilon}
+\newvar\vzeta{\zeta}
+\newvar\veta{\eta}
+\newvar\vtheta{\theta}
+\newvar\viota{\iota}
+\newvar\vkappa{\kappa}
+\newvar\vlambda{\lambda}
+\newvar\vmu{\mu}
+\newvar\vnu{\nu}
+\newvar\vxi{\xi}
+\newvar\vpi{\pi}
+\newvar\vvarpi{\varpi}
+\newvar\vrho{\rho}
+\newvar\vsigma{\sigma}
+\newvar\vtau{\tau}
+\newvar\vupsilon{\upsilon}
+\newvar\vphi{\phi}
+\newvar\vvarphi{\varphi}
+\newvar\vchi{\chi}
+\newvar\vpsi{\psi}
+\newvar\vomega{\omega}
+
+\newvar\vGamma{\Gamma}
+\newvar\vDelta{\Delta}
+\newvar\vTheta{\Theta}
+\newvar\vLambda{\Lambda}
+\newvar\vXi{\Xi}
+\newvar\vPi{\Pi}
+\newvar\vSigma{\Sigma}
+\newvar\vUpsilon{\Upsilon}
+\newvar\vPhi{\Phi}
+\newvar\vPsi{\Psi}
+\newvar\vOmega{\Omega}
+
+\newvar\sheafF{\mathcal{F}}
+\newvar\sheafG{\mathcal{G}}
+\newvar\sheafO{\mathcal{O}}
+\newvar\sheafHom{\mathcal{H}\!\!om}
+
+\newvar\Hom{\operatorname{Hom}}
+
+\usepackage{showexpl,newunicodechar}
+
+\newunicodechar{⟨}{\textlangle}
+\newunicodechar{⟩}{\textrangle}
+
+
+\setupclass{var}{
+	novaluekeys={
+		{inverseimage}{upper={-1},nopar},
+	},
+}
+
+\newcohomologyclass{cohomology}[
+	parent=var,
+	valuekeys={
+		{arg}{argwithkeyval={#1}},
+	},
+	gradingpos=upper,
+]
+
+\newcohomologyclass{homology}[
+	parent=cohomology,
+	gradingpos=lower,
+]
+
+\newcohomology\co{H}
+
+\newhomology\ho{H}
+
+\makeatother
+
+\begin{document}
+
+\maketitle
+
+\lstset{%
+	language=[LaTeX]TeX,
+	basicstyle=\ttfamily\small,
+	commentstyle=\itshape\ttfamily\small,
+	extendedchars=true,
+	breaklines=true,
+	breakindent={0pt},
+	captionpos=t,
+	pos=r,
+	tabsize=2,
+	inputencoding=utf8,
+	extendedchars=true,
+	explpreset={numbers=none,},
+	literate={⟨}{\textlangle}1 {⟩}{\textrangle}1,
+}
+
+
+
+\newcommand*\mybs{$\backslash$}
+
+\newcommand*\commandname[1]{\mybs\texttt{#1}}
+
+\let\pack=\texttt
+
+\newcommand\semantex{Seman\!\TeX\xspace}
+
+\noindent
+The \semantex package for \LaTeX\ delivers a more semantic, systematized way of writing mathematics, compared to the ordinary math syntax. The system is object-oriented and uses keyval syntax, and everything is highly customizable. At the same time, care has been taken to make it intuitive, natural, practical, and with an easy-to-use and lightweight syntax.
+\textbf{Note: \semantex is still in its alpha stage and cannot be considered stable at this point. You are more than welcome to report bugs and come with suggestions!}
+
+\begingroup
+	\setupclass{var}{
+		novaluekeys={
+			{inverseimage}{upper={-1},nopar},
+		},
+		valuekeys={
+			{stalk}{lower=#1},
+			{res}{ return,symbolputright={|}, lower={#1} },
+		},
+		argvaluekeys={
+			{coef}{sep={;}{#1}},
+		},
+	}
+	
+	Traditional math notation in \TeX\ is not particularly semantic -- you usually type the raw \emph{notation} rather than the underlying
+	\emph{meaning} of your math.
+	Take, for instance, the following equations from algebraic geometry:
+	\begin{align*}
+		\vf[inverseimage]{\sheafF}[spar,stalk=\vp]
+		&=
+		\sheafF[stalk=\vf{\vp}] ,
+	\\
+		\sheafO[\vU]
+		&=
+		\sheafO[\vX,res=\vU] ,
+	\\
+		\sheafHom{ \sheafF , \sheafG }{\vU}
+		&=
+		\Hom[\sheafO[\vU]]{ \sheafF[res=\vU] , \sheafG[res=\vU] } ,
+	\\
+		\co{0}{\vU,coef=\sheafO[\vX]} &= \sheafO[\vX]{\vU} 
+		.
+	\end{align*}
+	Here, \( \sheafF \) and~\( \sheafG \)
+	are sheaves on some scheme~\( \vX \),
+	\( \sheafO[\vX] \)~is the structure sheaf,
+	and~\( \vU \subset \vX \) an open subset.
+	In traditional \TeX, you would probably define a collection of commands \lstinline!\sheafF!, \lstinline!\sheafG!, \lstinline!\sheafO!, and~\lstinline!\sheafHom! for~\( \sheafF \),~\( \sheafG \), \( \sheafO \), and~\( \sheafHom \) and then proceed
+	something like
+	\begin{lstlisting}
+(f^{-1}\sheafF)_{p}=\sheafF_{f(p)},
+\sheafO_{U} = \sheafO_{X}|_{U},
+\sheafHom( \sheafF , \sheafG)(U)
+	= \Hom_{\sheafO_{X} ( \sheafF|_{U} , \sheafG|_{V} ),
+	H^{0}(U;\sheafF) = \sheafF(U).
+	\end{lstlisting}
+	For more than~90~\% of all mathematicians, this solution will be completely satisfactory; it prints what it is supposed to, and that's that.
+	If this is how you feel, there is absolutely no reason for you to continue reading. This package is for the remaining less than~10~\% who would prefer to write
+	something like the following instead:
+	\begin{lstlisting}
+\vf[inverseimage]{ \sheafF }[spar,stalk=\vp]
+	= \sheafF[ stalk=\vf{\vp} ] ,
+\sheafO[\vU] = \sheafO[ \vX, res=\vU ],
+\sheafHom{ \sheafF , \sheafG }{\vU}
+	= \Hom[\sheafO[\vU]]{ \sheafF[res=\vU],	\sheafG[res=\vU] },
+\co{0}{ \vU, coef=\sheafO[\vX] } = \sheafO[\vX]{\vU}.
+	\end{lstlisting}
+	
+	A lot of comments are in order.
+	The whole syntax will be explained in later chapters, but let us take a moment to look at these examples and understand the logic.
+	First of all, what is up with all the~\lstinline!v!'s in the command names \lstinline!\vf!, \lstinline!\vX!, \lstinline!\vU!? The~\lstinline!v!~stands for \textquote{variable}, and it is the prefix I recommend using for all standard variables. So for all letters in the alphabet, uppercase and lowercase, as well as the Greek ones, there will be a command: \lstinline!\va!, \lstinline!\vA!, \lstinline!\vb!, \lstinline!\vB!,~etc.
+	It is not always necessary to use them; for instance, in the above example, both \lstinline!\vX! and \lstinline!\vU! could have been replaced by simply~\lstinline!X!,~\lstinline!U! without changing anything. This is because we did not apply any arguments to these symbols. However, for the sake of consistency, I prefer to switch completely to using commands instead of writing the symbols directly.
+	How \emph{you} use the system is completely up to you.
+	
+	In \semantex, all entries are being built up from the inside and out.
+	The basic syntax layout for most \semantex commands is
+	\begin{lstlisting}
+\command[options]{argument}
+	\end{lstlisting}
+	Let us try focusing on the first example from above:
+	\begin{LTXexample}
+$\vf[inverseimage]{\sheafF}[spar,stalk=\vp]$
+	\end{LTXexample}
+	You always start with a central piece: a \emph{symbol}.
+	In the case of~\lstinline!\vf!, the symbol is~\( f \). After the symbol follows the options we apply to it, written in brackets~\lstinline![...]!. In this case, we the option~\lstinline!inverseimage!. This tells \semantex that we want the inverse image functor~\( \vf[inverseimage] \), so it adds a superscript~\lstinline!-1! to the symbol. After this, we apply the function~\lstinline!\vf[inverseimage]! to something, namely the sheaf~{$\sheafF$}. This is done by enclosing them in braces~\lstinline!{...}!.\footnote{You should be aware that this argument in braces~\texttt{\{...\}} is \emph{optional}. You can simply write~\texttt{$\backslash$vf[inverseimage]} if you want, and it will produce~\smash{\( \vf[inverseimage] \)}.}
+	
+	
+	Next, we want to take the stalk of this sheaf at the point~\( \vp \). If we simply wrote~\lstinline!\vf[inverseimage]{\sheafF}[stalk=\vp]!, we would get~\smash{\( \vf[inverseimage]{\sheafF}[stalk=\vp] \)}, which looks confusing. So we want to enclose~\smash{\( \vf[inverseimage]{\sheafF} \)} in parentheses before taking the stalk. This is done with the key~\lstinline!spar! (an abbreviation for \textquote{symbol parentheses}).
+	This key takes whatever has been typed so far, symbol and indices, and adds parentheses around it (of course, type and size is adjustable).
+	This~\lstinline!spar! is a key you fill find yourself using a lot.
+\endgroup
+
+\chapter{Getting started}
+
+To get started using \semantex, load down the package
+with
+\begin{lstlisting}
+\usepackage{semantex}
+\end{lstlisting}
+The \semantex system is object-oriented; all entities are objects of some class. When you load the package, there
+is only one class by default, which is simply called \lstinline!semantexvariable!.
+You should think of this as a low-level class, the parent of all other classes. Therefore, I highly advice against using it directly or modifying it.
+Instead, we create a new, more high-level variable class.
+To make notations brief, we call it \lstinline!var!.
+We could write \lstinline!\newvariableclass{var}!, but we choose to
+pass some options to it in~\lstinline![...]!:
+\begin{lstlisting}
+\newvariableclass{var}[output=var]
+\end{lstlisting}
+This \lstinline!output=var! option will be explained better below.
+Roughly speaking, it tells \semantex that everything
+a variable \emph{outputs} will also be a variable.
+For instance, if the function~\lstinline!\vf! (i.e.~\( \vf \)) is of class~\lstinline!var!,
+then \lstinline!\vf{\vx}!~(i.e.~\( \vf{\vx} \))~will also of class~\lstinline!var!.
+
+Now we have a class, but we do not have any objects.
+When we create the class~\lstinline!var!, the system
+automatically defines the command \lstinline!\newvar!
+that creates a new object of class~\lstinline!var!. The syntax is
+\begin{lstlisting}
+\newvar\⟨variable name⟩{⟨variable symbol⟩}[options]
+\end{lstlisting}
+For instance, we may write
+\begin{lstlisting}
+\newvar\vf{f}
+\newvar\vx{x}
+\end{lstlisting}
+to get two variables \lstinline!\vf! and~\lstinline!\vx! with symbols \( f \) resp.~\( x \).
+Let us perform a stupid test to see if the variables work:
+\begin{LTXexample}
+$\vf$, $\vx$
+\end{LTXexample}
+Th general syntax of a variable-type command is
+\begin{lstlisting}
+\command[options]{argument}
+\end{lstlisting}
+Both \lstinline!options! and \lstinline!argument! are optional
+arguments (they can be left out if you do not need them).
+The \lstinline!options! should consist of a list of options separated by commas, using keyval syntax. On the other hand, \lstinline!argument! is the actual argument of the function.
+By design, \semantex does not distinguish between variables and functions, so all variables can take arguments.
+This is a design choice to make the system easier to use; after all, it is fairly common in mathematics that something is first a variable and then a moment later takes an argument.
+So we may write:
+\begin{LTXexample}
+$\vf{1}$, $\vf{\vx}$
+\end{LTXexample}
+
+So far, we do not have very many options to write in the
+\lstinline!options! position, since we have not added any keys yet. However, we do have access
+to the most important of all options: the \emph{index}.
+There is a simple shortcut for writing an index: You simply write the index itself in the options tag:
+\begin{LTXexample}
+$\vf[1]$, $\vf[\vf]$,
+$\vf[1,2,\vf]{2}$
+\end{LTXexample}
+As long as what you write in the options tag is not recognized as a predefined key, it will be printed as the index.
+Other than that, there are two important predefined keys: \lstinline!upper! and \lstinline!lower! which simply add something to the upper and lower index:
+\begin{LTXexample}
+$\vf[upper=2]$,
+$\vf[lower=3]$
+\end{LTXexample}
+
+We are soon going to need more variables
+than just \( \vf \) and~\( \vx \).
+In fact, I advise you to create a variable for each letter in the Latin and Greek alphabets, both uppercase and lowercase.
+This is pretty time-consuming, so I did it for you already:
+\begin{lstlisting}
+\newvar\va{a}
+\newvar\vb{b}
+\newvar\vc{c}
+\newvar\vd{d}
+\newvar\ve{e}
+\newvar\vf{f}
+\newvar\vg{g}
+\newvar\vh{h}
+\newvar\vi{i}
+\newvar\vj{j}
+\newvar\vk{k}
+\newvar\vl{l}
+\newvar\vm{m}
+\newvar\vn{n}
+\newvar\vo{o}
+\newvar\vp{p}
+\newvar\vq{q}
+\newvar\vr{r}
+\newvar\vs{s}
+\newvar\vt{t}
+\newvar\vu{u}
+\newvar\vv{v}
+\newvar\vw{w}
+\newvar\vx{x}
+\newvar\vy{y}
+\newvar\vz{z}
+
+\newvar\vA{A}
+\newvar\vB{B}
+\newvar\vC{C}
+\newvar\vD{D}
+\newvar\vE{E}
+\newvar\vF{F}
+\newvar\vG{G}
+\newvar\vH{H}
+\newvar\vI{I}
+\newvar\vJ{J}
+\newvar\vK{K}
+\newvar\vL{L}
+\newvar\vM{M}
+\newvar\vN{N}
+\newvar\vO{O}
+\newvar\vP{P}
+\newvar\vQ{Q}
+\newvar\vR{R}
+\newvar\vS{S}
+\newvar\vT{T}
+\newvar\vU{U}
+\newvar\vV{V}
+\newvar\vW{W}
+\newvar\vX{X}
+\newvar\vY{Y}
+\newvar\vZ{Z}
+
+\newvar\valpha{\alpha}
+\newvar\vvaralpha{\varalpha}
+\newvar\vbeta{\beta}
+\newvar\vgamma{\gamma}
+\newvar\vdelta{\delta}
+\newvar\vepsilon{\epsilon}
+\newvar\vvarepsilon{\varepsilon}
+\newvar\vzeta{\zeta}
+\newvar\veta{\eta}
+\newvar\vtheta{\theta}
+\newvar\viota{\iota}
+\newvar\vkappa{\kappa}
+\newvar\vlambda{\lambda}
+\newvar\vmu{\mu}
+\newvar\vnu{\nu}
+\newvar\vxi{\xi}
+\newvar\vpi{\pi}
+\newvar\vvarpi{\varpi}
+\newvar\vrho{\rho}
+\newvar\vsigma{\sigma}
+\newvar\vtau{\tau}
+\newvar\vupsilon{\upsilon}
+\newvar\vphi{\phi}
+\newvar\vvarphi{\varphi}
+\newvar\vchi{\chi}
+\newvar\vpsi{\psi}
+\newvar\vomega{\omega}
+
+\newvar\vGamma{\Gamma}
+\newvar\vDelta{\Delta}
+\newvar\vTheta{\Theta}
+\newvar\vLambda{\Lambda}
+\newvar\vXi{\Xi}
+\newvar\vPi{\Pi}
+\newvar\vSigma{\Sigma}
+\newvar\vUpsilon{\Upsilon}
+\newvar\vPhi{\Phi}
+\newvar\vPsi{\Psi}
+\newvar\vOmega{\Omega}
+\end{lstlisting}
+
+Just like~\lstinline!\vf!, these can all be regarded as functions, so~\lstinline!\va{\vb}!~produces~\( \va{\vb} \).
+Importantly,
+\textbf{parentheses can be scaled}.
+To make parentheses bigger, use the following keys:
+\begin{LTXexample}
+$\vf{\vx}$,
+$\vf[par=\big]{\vx}$,
+$\vf[par=\Big]{\vx}$,
+$\vf[par=\bigg]{\vx}$,
+$\vf[par=\Bigg]{\vx}$,
+$\vf[par=auto]{\frac{1}{2}}$
+\end{LTXexample}
+Using \lstinline!par=auto! corresponds to using \lstinline!\left...\right!. Just as for ordinary math, I advice you to use manual scaling rather than automatic scaling, as \TeX\ has a tendency to scale things wrong. If you do not want parentheses at all, you can pass the key~\lstinline!nopar!:
+\begin{LTXexample}
+$\vf[nopar]{\vx}$
+\end{LTXexample}
+Primes are added via the key~\lstinline!prime!
+or the keys~\lstinline!'!,~\lstinline!''! and~\lstinline!'''!:
+\begin{LTXexample}
+$\vf['] = \vf[prime]$,
+$\vf[''] = \vf[prime,prime]$
+$\vf['''] = \vf[prime,prime,prime]$
+\end{LTXexample}
+
+So far, so good, but our variables cannot really do anything yet. For this, we need to assign \emph{keys} to them. The more pieces of math notation you need, the more keys you will have to define.
+Keys are being added via two different keys:
+\begin{center}
+	\lstinline!novaluekeys!
+	\qquad\qquad and \qquad\qquad
+	\lstinline!valuekeys!.
+\end{center}
+In short, \lstinline!novaluekeys! is for keys that do \emph{not} take a value (i.e.~keys using the syntax~\lstinline!\command[key]!), and \lstinline!valuekeys! is for keys that \emph{do} take a value
+(i.e.~keys using the syntax~\lstinline!\command[key=value]!)).
+We explain the syntax for using them in the next section where we show how to make keyval syntax for elementary calculus.
+
+\chapter{Example: Elementary calculus}
+
+One thing we might want to do to a variable
+is \emph{invert} it. We therefore add a key~\lstinline!inv!
+that adds an upper index~\lstinline!-1! to the symbol.
+We add this key using the key \lstinline!novaluekeys!:
+\begin{lstlisting}
+\setupclass{var}{
+	novaluekeys={
+		{inv}{ upper={-1} },
+	},
+}
+\end{lstlisting}
+\setupclass{var}{
+novaluekeys={
+	{inv}{ upper={-1} },
+},
+}
+Now the key \lstinline!inv!
+has been defined to be equivalent to \lstinline!upper={-1}!.
+Now we can do the following:
+\begin{LTXexample}
+$\va[inv]$, $\vf[inv]$,
+$\vg[1,2,inv]$,
+$\vh[\va,\vb,inv]$
+\end{LTXexample}
+The key \lstinline!novaluekeys! is for keys that take no value,
+like \lstinline!inv!.
+
+Other keys might need to take a value.
+For defining such, we have the command~\lstinline!valuekeys!.
+%There are two different keys for adding new keys
+%to a class: \lstinline!novaluekeys! and \lstinline!valuekeys!.
+%The difference is that
+For instance, suppose we want a command for deriving a function \( n \)~times.
+For this, we add the following extra keyval key~\lstinline!der!:
+\begin{lstlisting}
+\setupclass{var}{
+	novaluekeys={
+		{inv}{ upper={-1} },
+	},
+	valuekeys={
+		{der}{ upper={(#1)} },
+	},
+}
+\end{lstlisting}
+\setupclass{var}{
+valuekeys={
+	{der}{ upper={(#1)} },
+},
+}
+The~\lstinline!#1! will contain whatever the
+user added as the value of the key.
+Now we can write:
+\begin{LTXexample}
+$\vf[der=\vn]{\vx}$
+\end{LTXexample}
+Maybe we also want a more elementary operation:
+raising a variable to some \emph{power}.
+We could have called the key \lstinline!power!, but this is long and cumbersome, so let us simply call it \lstinline!to!:
+\begin{lstlisting}
+\setupclass{var}{
+	novaluekeys={
+		{inv}{ upper={-1} },
+	},
+	valuekeys={
+		{der}{ upper={(#1)} },
+		{to}{ upper={#1} },
+	},
+}
+\end{lstlisting}
+\setupclass{var}{
+	valuekeys={
+		{to}{ upper={#1} },
+	},
+}
+This allows us to write
+\begin{LTXexample}
+$\vx[to=2]$,
+$\vy[1,to=2] + \vy[2,to=2]$
+\end{LTXexample}
+In the long run, you might want to define a command~\lstinline!squared! or~\lstinline!sq! and make it equivalent to~\lstinline!to=2!.
+
+Let us try doing something a bit more complicated: Adding a key for restricting a function to a smaller subset.
+For this, we do the following:
+\begin{lstlisting}
+\setupclass{var}{
+	novaluekeys={
+		{inv}{ upper={-1} },
+	},
+	valuekeys={
+		{der}{ upper={(#1)} },
+		{to}{ upper={#1} },
+		{res}{ return,symbolputright={|}, lower={#1} },
+	},
+}
+\end{lstlisting}
+\setupclass{var}{
+	valuekeys={
+		{res}{ return,symbolputright={|}, lower={#1} },
+	},
+}
+This adds a horizonal line~\enquote{$|$}
+to the right of the symbol followed by
+a lower index containing whatever you passed to the key
+(contained in the \mbox{command~\lstinline!#1!)}.
+(There is also an extra key, \lstinline!return!, which is a bit more advanced and should be taken for granted for now. Roughly speaking, it is there to make sure that the restriction symbol is printed \emph{after} all indices that you might have added before. More details in \cref{ch:return}.)
+Now we may write the following:
+\begin{LTXexample}
+$\vf[res=\vU]{\vx}$,
+$\vg[1,res=\vY]{\vy}$,
+$\vh[inv,res=\vT]{\vz}$
+\end{LTXexample}
+
+If the reader starts playing around with the \semantex functions, they will discover that whenever you apply a function to something, the result becomes a new function that can take an argument itself. This behaviour is both useful and extremely necessary in order for the package to be useful in practice. For instance, you may write
+\begin{LTXexample}
+$\vf[der=\vn]{\vx}{\vy}{\vz}
+=\vg{\vu,\vv,\vw}[3]{
+	\vx[1],\vx[2]}[8,1,der=2]{\vt}$
+\end{LTXexample}
+Some people prefer to be able to scale the restriction
+line. I rarely do that, but for that purpose, we could do the following:
+\begin{lstlisting}
+\setupclass{var}{
+	valuekeys={
+		{bigres}{ return, symbolputright=\big\vert, lower={#1} },
+		{Bigres}{ return, symbolputright=\Big\vert, lower={#1} },
+		{biggres}{ return, symbolputright=\bigg\vert, lower={#1} },
+		{Biggres}{ return, symbolputright=\Bigg\vert, lower={#1} },
+		{autores}{ return, sparsize=auto, otherspar=.\vert,
+		sparsize=normal, lower={#1} },
+		% This auto scales the vertical bar. See the chapter on the spar
+		% key for information about sparsize and otherspar
+	},
+}
+\end{lstlisting}
+
+So to sum up, we first defined a class~\lstinline!var!
+via \lstinline!\newvariableclass! and then used \lstinline!\setupclass! to add keys to it. In fact, we could have done it all at once by passing these options directly to \lstinline!\newvariableclass!:
+\begin{lstlisting}
+	\newvariableclass{var}[
+		output=var,
+		novaluekeys={
+			{inv}{ upper={-1} },
+		},
+		valuekeys={
+			{der}{ upper={(#1)} },
+			{to}{ upper={#1} },
+			{res}{ rightreturn, symbolputright={|},
+				lower={#1} },
+		},
+	]
+\end{lstlisting}
+As we proceed in this guide, we shall use \lstinline!\setupclass!
+to add more and more keys to~\lstinline!var!. However, when you set up your own system, you may as well just add all of the keys like this when you create the class and then be done with it.
+
+Let me add that it is possible to create subclasses of existing classes. You just write \lstinline!parent=myclass! in the class declaration to tell that \lstinline!myclass! is the parent class. \textbf{But a word of warning:} It is a natural idea to create different classes for different mathematical entities, each with their own keyval syntax that fits whatever class you are in; for instance, you could have one class for algebraic structures like rings and modules with keys for opposite rings and algebraic closure, and you could have another class for topological spaces with keys for closure and interior. However, as the reader can probably imagine, this becomes extremely cumbersome to work with in practice since an algebraic structure might very well also carry a topology. So at the end of the day, I advice you to use a single superclass \lstinline!var! that has all the keyval syntax and only use subclasses for further \emph{customization}. We shall see examples of this below.
+\chapter{Example: Elementary algebra}
+
+\setupclass{var}{
+	novaluekeys={
+		{pol}{
+			par, 	% This tells semantex to use parentheses around
+						% the argument in the first place, in case this
+						% had been turned off
+			leftpar=[,rightpar=],
+		},
+	},
+}
+
+Let us try to use the \semantex system to build some commands
+for doing algebra.
+As an algebraist, one of the first things you might want to do is to create polynomial rings~\( \vk[pol]{\vx,\vy,\vz} \). Since all variables can already be used as functions (this is a design choice we discussed earlier), all we need to do is find a way to change from using parentheses to square brackets. This can be done the following way:
+\begin{lstlisting}
+\setupclass{var}{
+	novaluekeys={
+		{pol}{
+			par, 	% This tells semantex to use parentheses around
+						% the argument in the first place, in case this
+						% had been turned off
+			leftpar=[,rightpar=],
+		},
+	},
+}
+\end{lstlisting}
+Now we may write
+\begin{LTXexample}
+	$\vk[pol]{\vx,\vy,\vz}$
+\end{LTXexample}
+It is straightforward how to do adjust this to instead write the \emph{field} generated by the variables~\( x, y, z \):
+\begin{lstlisting}
+\setupclass{var}{
+	novaluekeys={
+		{pol}{
+			par, 	% This tells semantex to use parentheses around
+						% the argument in the first place, in case this
+						% had been turned off
+			leftpar=[,rightpar=],
+		},
+		{field}{
+			par,
+			leftpar=(,rightpar=),
+		},
+	},
+}
+\end{lstlisting}
+\setupclass{var}{
+	novaluekeys={
+		{field}{
+			par,
+			leftpar=(,rightpar=),
+		},
+	},
+}
+Now \lstinline!\vk[field]{\vx,\vy,\vz}! produces~\( \vk[field]{\vx,\vy,\vz} \). Of course, leaving out the \lstinline!field!
+key would produce the same result with the current configuration of~\lstinline!var!. However, it is still best to use a key for this, both because this makes the semantics more clear, but also because you might later change some settings that would cause the default behaviour to be different.
+
+Adding support for free algebras and fields is almost as easy, but there is a catch:
+\begin{lstlisting}
+\setupclass{var}{
+	novaluekeys={
+		{pol}{
+			par, 	% This tells semantex to use parentheses around
+						% the argument in the first place, in case this
+						% had been turned off
+			leftpar=[,rightpar=],
+		},
+		{field}{
+			par,
+			leftpar=(,rightpar=),
+		},
+		{freealg}{
+			par,
+			leftpar=\noexpand\langle,
+			rightpar=\noexpand\rangle,
+		},
+		{powerseries}{
+			par,
+			leftpar=\noexpand\llbracket,
+			rightpar=\noexpand\rrbracket,
+		},
+		{laurent}{
+			par,
+			leftpar=(, rightpar=),
+			prearg={\!\!\noexpand\semantexdelimsize(},
+			postarg={\noexpand\semantexdelimsize)\!\!},
+			% These are printed before and after the argument.
+			% The command "\semantexdelimsize" is substituted
+			% by \big, \Big, ..., or whatever size the
+			% argument delimiters have
+		},
+	},
+}
+\end{lstlisting}
+\setupclass{var}{
+	novaluekeys={
+		{freealg}{
+			par,
+			leftpar=\noexpand\langle,
+			rightpar=\noexpand\rangle,
+		},
+		{powerseries}{
+			par,
+			leftpar=\noexpand\llbracket,
+			rightpar=\noexpand\rrbracket,
+		},
+		{laurent}{
+			par,
+			leftpar=(, rightpar=),
+			prearg={\!\!\noexpand\semantexdelimsize(},
+			postarg={\noexpand\semantexdelimsize)\!\!},
+			% These are printed before and after the argument.
+			% The command "\semantexdelimsize" is substituted
+			% by \big, \Big, ..., or whatever size the
+			% argument delimiters have
+		},
+	},
+}
+For expansion reasons (which I am not completely sure of),
+we need \lstinline!\noexpand! before these commands.
+In general, whenever something fails, try throwing in \lstinline!\noexpand!'s in front of suspicious-looking commands,
+and things will usually work out just fine. See for yourself:
+\begin{LTXexample}
+$\vk[freealg]{\vx}$,
+$\vk[powerseries]{\vy}$,
+$\vk[laurent]{\vz}$
+\end{LTXexample}
+
+
+Let us look at some other algebraic operations that we can control via \semantex:
+\begin{lstlisting}
+\setupclass{var}{
+	novaluekeys={
+		{op}{upper={\noexpand\mathrm{op}}},
+			% opposite groups, rings, categories, etc.
+		{algclosure}{overline},
+			% algebraic closure
+		{conj}{overline},
+			% complex conjugation
+		{dual}{upper=*},
+			% dual vector space
+		{perp}{upper=\perp},
+			% orthogonal complement
+	},
+	valuekeys={
+		{mod}{symbolputright={/#1}},
+			% for modulo notation like R/I
+		{dom}{symbolputleft={#1\backslash}},
+			% for left modulo notation like I\R
+			% "dom" is "mod" spelled backwards
+		{oplus}{upper={\oplus#1}},
+			% for notation like R^{\oplus n}
+		{tens}{upper={\otimes#1}},
+			% for notation like R^{\otimes n}
+		{localize}{symbolputright={ \relax [#1^{-1}] }},
+			% localization at a multiplicative subset;
+			% the \relax is necessary becauese, in some cases,
+			% the [...] can be interpreted as an optional argument
+		{localizeprime}{lower={#1}},
+			% for localization at a prime ideal
+	},
+}
+\end{lstlisting}
+\setupclass{var}{
+	novaluekeys={
+		{op}{upper={\noexpand\mathrm{op}}},
+			% opposite groups, rings, categories, etc.
+		{algclosure}{overline},
+			% algebraic closure
+		{conj}{overline},
+			% complex conjugation
+		{dual}{upper=*},
+			% dual vector space
+		{perp}{upper=\perp},
+			% orthogonal complement
+	},
+	valuekeys={
+		{mod}{symbolputright={/#1}},
+			% for modulo notation like R/I
+		{dom}{symbolputleft={#1\backslash}},
+			% for left modulo notation like I\R
+			% "dom" is "mod" spelled backwards
+		{oplus}{upper={\oplus#1}},
+			% for notatoin like R^{\oplus n}
+		{tens}{upper={\otimes#1}},
+			% for notation like R^{\otimes n}
+		{localize}{symbolputright={ [#1^{-1}] }},
+			% localization at a multiplicative subset
+		{localizeprime}{lower={#1}},
+			% for localization at a prime ideal
+	},
+}
+Let us see it in practice:
+\begin{LTXexample}
+$\vR[op]$, $\vk[algclosure]$,
+$\vz[conj]$, $\vV[dual]$,
+$\vR[mod=\vI]$,$\vR[dom=\vJ]$,
+$\vR[oplus=\vn]$,
+$\vV[tens=\vm]$,
+$\vR[localize=\vS]$,
+$\vR[localizeprime=\vI]$,
+$\vk[freealg]{\vS}[op]$,
+$\vV[perp]$
+\end{LTXexample}
+
+\chapter{The \texttt{spar} key}
+
+The \lstinline!spar! key is one of the most important commands in \semantex at all. To understand why we need it, imagine you want to derive a function \( \vn \)~times and then invert it. Writing something like
+\begin{LTXexample}
+$\vf[der=\vn,inv]$
+\end{LTXexample}
+does not yield a satisfactory result. However, the \lstinline!spar! key saves the day:
+\begin{LTXexample}
+$\vf[der=\vn,spar,inv]$
+\end{LTXexample}
+So \lstinline!spar! simply adds a pair of parentheses around the current symbol, complete with all indices that you may have added to it so for. The name \lstinline!spar! stands for \enquote{symbol parentheses}. You can add as many as you like:
+\begin{LTXexample}
+$ \vf[1,res=\vV,spar,conj,op,spar,0,inv,spar,mod=\vI,spar,dual]{\vx} $
+\end{LTXexample}
+If it becomes too messy, you can scale the parentheses, too. Simply use the syntax
+\lstinline!spar=\big!, \lstinline!spar=\Big!, etc.
+You can also get auto-scaled parentheses base on \lstinline!\left...\right!,
+using the key \lstinline!spar=auto!:
+\begin{LTXexample}
+$\vf[spar]$,
+$\vf[spar=\big]$,
+$\vf[spar=\Big]$,
+$\vf[spar=\bigg]$,
+$\vf[spar=\Bigg]$,
+$\vf[spar=auto]$
+\end{LTXexample}
+So returning to the above example, we can write
+\begin{LTXexample}
+$\vf[1,res=\vV,spar,conj,op,spar=\big,0,inv,spar=\Big,mod=\vI,spar=\bigg,dual]{\vx}$
+\end{LTXexample}
+To adjust the type of parentheses, use the \lstinline!leftspar! and \lstinline!rightspar! keys:
+\begin{LTXexample}
+$\vf[leftspar={[},rightspar={\}},spar,spar=\Bigg]$
+\end{LTXexample}
+Occassionally, it is useful to be able to input a particular kind of parentheses just once,
+without adjusting any settings. For this purpose, we have the (previously mentioned)
+\lstinline!otherspar!~key. It uses the syntax~\lstinline!otherspar={opening parenthesis}{closing parenthesis}!:
+\begin{LTXexample}
+$\vf[otherspar={[}{)},otherspar={\{}{\rangle},
+	spar]$
+\end{LTXexample}
+
+
+\chapter{The \texttt{command} key}
+
+Above, we used the key \lstinline!overline! a couple of times:
+\begin{LTXexample}
+$\va[overline]$,
+$\vH[overline]$
+\end{LTXexample}
+This command applies the command \lstinline!\overline!
+to the symbol. In fact, you can create similar commands yourself via
+the \lstinline!command! key.
+In fact, you could have defined the \lstinline!overline! yourself as follows:
+\begin{lstlisting}
+\setupclass{var}{
+	novaluekeys={
+		{overline}{command=\noexpand\overline},
+	},
+}
+\end{lstlisting}
+\setupclass{var}{
+	novaluekeys={
+		{overline}{command=\noexpand\overline},
+	},
+}
+This is how the key \lstinline!overline! is defined internally, except it is defined on the level of the superclass \lstinline!automathvariable! instead. We need the key \lstinline!\noexpand! in order for everything to expand properly. This is only necessary for some commands, and to tell the truth, I haven't quite figured out the system of which commands need it and which ones do not. However, as usual, if something does not work, try throwing in some \lstinline!\noexpand!'s and see if it solves the problem.
+Here are some more examples of predefined keys that use the command key:
+\begin{lstlisting}
+\setupclass{var}{ % do not add these -- they are already predefined!
+	novalueskeys={
+		{smash}{command=\noexpand\smash},
+		{tilde}{command=\noexpand\tilde},
+		{widetilde}{command=\widetilde},
+		{bar}{command=\noexpand\bar},
+		{bold}{command=\noexpand\mathbf},
+		{roman}{command=\noexpand\mathrm},
+	},
+}
+\end{lstlisting}
+Let us test:
+\begin{LTXexample}
+$\va[widetilde]$,
+$\va[bold]$,
+$\va[roman]$,
+$\va[bar]$
+\end{LTXexample}
+
+\chapter{The \texttt{return} keys}\label{ch:return}
+
+Suppose you want to take the complex conjugate of the variable~\( \vz[1] \). Then you might write something like
+\begin{LTXexample}
+$\vz[1,conj]$
+\end{LTXexample}
+Notice that the bar has only been added over the~\( \vz \), as is standard mathematical typography; you do not normally write~\( \vz[1,return,conj] \).
+This reveals a design choice that has been made in \semantex:
+When you add an index or a command via the \lstinline{command} key,
+it is not immediately applied to the symbol.
+Rather, both commands and indices are added to a register and are then applied at the very last, right before the symbol is printed.
+This allows us to respect standard mathematical typography, as shown above.
+
+However, there are other times when this behaviour is not what you want.
+For instance, if you want to comjugate the inverse of a function, the following looks wrong:
+\begin{LTXexample}
+$\vf[inv,conj]$
+\end{LTXexample}
+Therefore, there is a command \lstinline!return! that can be applied at any point to invoke the routine of adding all indices and commands to the symbol. Let us try it out:
+\begin{LTXexample}
+$\vf[inv,return,conj]$
+\end{LTXexample}
+In fact, \lstinline!return! is an umbrella key that invokes three different return routines: \lstinline!leftreturn!, \lstinline!innerreturn!, and \lstinline!rightreturn!. The command \lstinline!leftreturn! adds the left indices to the symbol (we have not discussed left indices yet, though). The command \lstinline!innerreturn! adds all commands to the symbol (those defined using the \lstinline!command!~key).
+Finally, \lstinline!rightreturn! adds all right indices and arguments to the symbol.
+In general, the user should probably be satisfied with just using \lstinline!return!.
+
+\chapter{Example: Algebraic geometry}
+
+Let us discuss how to typeset sheaves and operations on morphisms in algebraic geometry.
+First of all, adding commands for sheaves is not a big deal:
+\begin{lstlisting}
+\newvar\sheafF{\mathcal{F}}
+\newvar\sheafG}{\mathcal{G}}
+\newvar\sheafH{\mathcal{H}}
+\newvar\sheafO{\mathcal{O}}
+\newvar\sheafHom{\mathcal{H}\!\!om}
+\end{lstlisting}
+You can of course add as many sheaf commands as you need.
+Also, to make notations shorter, you could consider
+calling the commands~\lstinline!\shF!, \lstinline!\shG!, \lstinline!\shH!, \lstinline!\shO!, and~\lstinline!\shHom! instead, as I usually do.
+You may also want to have a separate command~\lstinline!shreg!
+for the sheaf~\( \sheafO \)
+of regular functions.
+
+Next, for morphisms of schemes~\( \vf \colon \vX \to \vY \),
+we need to be able to typeset comorphisms as well as the one hundred thousand different pullback and pushforward operations. For this, we add some keys to the \lstinline!var! key:
+\begin{lstlisting}
+\setupclass{var}{
+	novaluekeys={
+		{comor}{upper=\#},
+			% comorphisms, i.e. f^{\#}
+		{inverseimage}{upper={-1},nopar},
+			% inverse image of sheaves
+		{shpull}{upper=*,nopar},
+			% sheaf *-pullback
+		{shpush}{lower=*,nopar},
+			% sheaf *-pushforward
+		{sh!pull}{upper=!,nopar},
+			% sheaf !-pullback
+		{sh!push}{lower=!,nopar},
+			% sheaf !-pushforward
+	},
+}
+\end{lstlisting}
+\setupclass{var}{
+	novaluekeys={
+		{comor}{upper=\#},
+			% comorphisms, i.e. f^{\#}
+		{inverseimage}{upper={-1},nopar},
+			% inverse image of sheaves
+		{shpull}{upper=*,nopar},
+			% sheaf *-pullback
+		{shpush}{lower=*,nopar},
+			% sheaf *-pushforward
+		{sh!pull}{upper=!,nopar},
+			% sheaf !-pullback
+		{sh!push}{lower=!,nopar},
+			% sheaf !-pushforward
+	},
+}
+We have added the command \lstinline!nopar! to all pullback and pushforward commands since it is custom to write, say,~\( \vf[shpull]{\sheafF} \) rather than~\( \vf[shpull,par]{\sheafF} \). Of course, you can decide that for yourself, and in any case, you can write~\lstinline!\vf[shpull,par]{\shF}! if you want to force it to use parentheses in a particular case. Of course, since all \semantex variables can be used as functions, so can whatever these pullback and pushforward operations output. So we may write:
+\begin{LTXexample}
+For a morphism~$ \vf \colon
+\vX \to \vY $ with
+comorphism~$ \vf[comor]
+\colon \sheafO[\vY] \to
+\vf[shpush]{\sheafO[\vX]} $,
+and for a sheaf~$ \sheafF $ on~$ \vY $, we can define the
+pullback~$ \vf[shpull]{
+\sheafF} $ by letting~$
+\vf[shpull]{ \sheafF}{\vU} = \cdots $ and the $ ! $-pullback by letting~$
+\vf[sh!pull]{\sheafF}{\vU} = \cdots $.
+\end{LTXexample}
+Maybe some people would write \lstinline!pull!, \lstinline!push!, etc.~instead, but there are other things in math called pullbacks, so I prefer to use the \lstinline!sh!~prefix to show that this is for sheaves.
+Probably, in the long run, an algebraic geometer might also want
+to abbreviate~\lstinline!inverseimage! to~\lstinline!invim!.
+
+There are a number of other operations we might want to do for sheaves. We already defined the key~\lstinline!res! for restriction, so there is no need to define this again.
+However, we might need to stalk, sheafify, take dual sheaves, and twist sheaves. Let us define keys for this:
+\begin{lstlisting}
+\setupclass{var}{
+	valuekeys={
+		{stalk}{clower={#1}},
+		{twist}{return,symbolputright={(#1)}},
+	},
+	novaluekeys={
+		{sheafify}{upper=+},
+		{shdual}{upper=\vee},
+	},
+}
+\end{lstlisting}
+\setupclass{var}{
+	valuekeys={
+		{stalk}{clower={#1}},
+		{twist}{return,symbolputright={(#1)}},
+	},
+	novaluekeys={
+		{sheafify}{upper=+},
+		{shdual}{upper=\vee},
+	},
+}
+The key \lstinline!clower! stands for \enquote{comma-lower}.
+It is like \lstinline!lower!, except that it checks whether the index
+is already non-empty, and if so, it separates the new index from the previous index by a comma. There is, of course, a \lstinline!cupper!~key that does the same with the upper index.
+\begin{LTXexample}
+$\sheafF[res=\vU,stalk=\vp]$,
+$\sheafF[res=\vU,spar,stalk=
+\vp]$, 
+$\sheafO[\vX,stalk=\vp]$,
+$\sheafG[sheafify]$,
+$\vf[inverseimage]{\sheafO[
+\vY]}[spar,stalk=\vx]$
+$\sheafG[shdual]$,
+$\sheafO[\vX][twist=-1]$,
+$\sheafO[twist=1,shdual]$
+\end{LTXexample}
+
+\chapter{Example: Homological algebra}
+
+Before you venture into homological algebra, you should probably
+define some keys for the standard constructions:
+
+\begin{lstlisting}
+\newvar\Hom{\operatorname{Hom}}
+\newvar\Ext{\operatorname{Ext}}
+\newvar\Tor{\operatorname{Tor}}
+\end{lstlisting}
+\newvar\Ext{\operatorname{Ext}}
+\newvar\Tor{\operatorname{Tor}}
+Now the ability to easily print indices via the options key will come in handy:
+\begin{LTXexample}
+$\Hom[\vA]{\vM,\vN}$,
+$\Ext[\vA]{\vM,\vN}$
+\end{LTXexample}
+\setupclass{var}{
+valuekeys={
+		{shift}{ return,symbolputright={ \relax [ {#1} ] } },
+		% \relax is necessary since otherwise [...] can
+		% occasionally be interpreted as an optional argument
+	},
+}
+You will probably need several keyval interfaces, some of which will be covered below. But right now, we shall implement a shift operation~\( \vX\mapsto\vX[shift=\vn] \):
+\begin{lstlisting}
+\setupclass{var}{
+	valuekeys={
+		{shift}{ return,symbolputright={ \relax [ {#1} ] } },
+		% \relax is necessary since otherwise [...] can
+		% occasionally be interpreted as an optional argument
+	},
+}
+\end{lstlisting}
+Let us see that it works:
+\begin{LTXexample}
+$\vX\mapsto\vX[shift=\vn]$
+\end{LTXexample}
+
+\section{The keys \texttt{i = index} and \texttt{d = deg = degree}}
+
+Homological algebra is a place where people
+have very different opinions about the positions of the gradings.
+As an algebraist, I am used to \emph{upper} gradings (\enquote{cohomological} grading), whereas many topologists prefer \emph{lower} gradings (\enquote{homological} grading). The \semantex system
+supports both, but the default is upper gradings (the package author has the privilege to decide).
+You can adjust this by writing
+\lstinline!gradingpos=upper! or~\lstinline!gradingpos=lower!.
+
+
+We already learned about the keys \lstinline!upper! and~\lstinline!lower!.
+There are two more, \enquote{relative} keys that print the index either as an upper index or as a lower index, depending on your preference for cohomological or homological grading. They are called
+\begin{center}
+	\lstinline!index!
+	\qquad\qquad and\qquad\qquad
+	\lstinline!degree!
+\end{center}
+The \lstinline!degree! is the actual grading in the homological algebra
+sense. The \lstinline!index! is an additional index where you can put extra information that you might need.
+To understand the difference, keep the following two examples
+in mind: the hom complex~\( \Hom[*,index=\vA] \) and the simplicial homology~\( \ho[*,index=\vDelta] \) (we will define the command~\lstinline!\ho! for homology in the next section):
+\begin{LTXexample}
+$\Hom[index=\vA,degree=0]$,
+$\ho[index=\vDelta,degree=1]$
+\end{LTXexample}
+These names are not perfect; many people would say that the degree is also
+an index, but feel free to come up with a more satisfactory naming principle, and I shall be happy to consider it. These names probably become a bit too heave to write in the long run, so both keys have abbreviated equivalents:
+\begin{center}
+	\lstinline!i! = \lstinline!index!
+	\qquad\qquad and\qquad\qquad
+	\lstinline!d! = \lstinline!deg! = \lstinline{degree}
+\end{center}
+Let us see them in action:
+\begingroup\begin{LTXexample}
+$ \vX[d=3,i=\vk] $
+
+\setupobject\vX{
+	gradingpos=lower
+}
+
+$ \vX[d=3,i=\vk] $
+\end{LTXexample}\endgroup
+\noindent (We haven't seen the command \lstinline!\setupobject! before, but I imagine you can guess what it does).
+If you want to print a bullet as the degree, there is the predefined key~\lstinline!*! for this:
+\begingroup\begin{LTXexample}
+$ \vX[*] $
+
+\setupobject\vX{
+	gradingpos=lower
+}
+
+$ \vX[*] $
+\end{LTXexample}\endgroup
+
+I guess it is also time to reveal that the previously mentioned shorthand notation~\lstinline!\vx[1]! for indices always prints the~\lstinline!1! on the \lstinline{index} position. So changing the grading position changes the position of the index:
+\begingroup\begin{LTXexample}
+$ \vX[1] $
+
+\setupobject\vX{
+	gradingpos=lower
+}
+
+$ \vX[1] $
+\end{LTXexample}\endgroup
+In other words, in the first example above, we could have written
+\begin{LTXexample}
+$\Hom[\vA,d=0]$,
+$\ho[\vDelta,d=1]$
+\end{LTXexample}
+
+
+Note that the use of the short notations \lstinline!d! and~\lstinline!i! does not mean you cannot write e.g. \lstinline!\vx[d]! and~\lstinline!\vx[i]!.
+In fact, this is not the case:
+\begin{LTXexample}
+$\vf[i]$, $\vf[i=]$,
+$\vf[d]$, $\vf[d=]$
+\end{LTXexample}
+As we see, it is only when a \lstinline!d! or~\lstinline!i! key is followed by an equality sign~\lstinline!=!
+that the routines of these keys are invoked.
+In fact, \semantex carefully separates
+\lstinline!valuekeys! from \lstinline!novaluekeys!.
+
+\section{The \texttt{cohomology} class type}
+
+Now homological algebra is hard unless we can do \emph{cohomology} and \emph{homology}. In principle, this is not hard
+to do, as we can write e.g.~\lstinline!\vH[d=0]{\vX}! to get~\( \vH[d=0]{\vX} \).
+However, some people might find it cumbersome to have to write~\lstinline!d=! every time you want to print an index.
+This is probably the right time to reveal that \semantex supports multiple class \emph{types}.
+So far, we have been exclusively using the \lstinline!variable!
+class type, but there are several others.
+The first one we shall need is the \lstinline!cohomology! class type, which has a different input syntax that fits cohomology.
+Let us try to use it:
+\begin{lstlisting}
+\newcohomologyclass{cohomology}[parent=var,gradingpos=upper]
+
+\newcohomology\co{H}
+
+\newcohomologyclass{homology}[parent=cohomology,gradingpos=lower]
+
+\newhomology\ho{H}
+\end{lstlisting}
+The cohomology command~\lstinline!\co! in general works very much
+like a command of variable type. However, the input syntax is a bit different:
+\begin{lstlisting}
+\co[options]{degree}{argument}
+\end{lstlisting}
+All three arguments are optional. Let us see it in practice:
+\begin{LTXexample}
+$\co{0}$, $\co{*}$,
+$\co{\vi}{\vX}$,
+$\co[\vG]{0}$,
+$\co[\vH]{*}$,
+$\co[\vDelta]{\vi}{\vX}$
+\end{LTXexample}
+
+\begin{LTXexample}
+$\ho{0}$, $\ho{*}$,
+$\ho{\vi}{\vX}$,
+$\ho[\vG]{0}$,
+$\ho[\vH]{*}$,
+$\ho[\vDelta]{\vi}{\vX}$
+\end{LTXexample}
+Of course, you can define similar commands for cocycles, coboundaries, and all sorts of other entities that show up in homological algebra.
+
+You might also want to implement feature like reduced cohomology, \v{C}ech cohomology,
+and hypercohomology. This is quite easy with the \lstinline!command! key:
+\begin{lstlisting}
+\setupclass{var}{
+	novaluekeys={
+		{reduced}{command=\widetilde},
+		{cech}{command=\noexpand\check},
+		{hyper{command=\noexpand\mathbb},
+	},
+}
+\end{lstlisting}
+\setupclass{var}{
+	novaluekeys={
+		{reduced}{command=\widetilde},
+		{cech}{command=\noexpand\check},
+		{hyper}{command=\noexpand\mathbb},
+	},
+}
+
+\begin{LTXexample}
+$\co[reduced]{i}$,
+$\co[cech]{*}$,
+$\co[hyper,cech]{0}{\vX}$
+\end{LTXexample}
+
+The cohomology class also provides a nice way
+to implement derived functors:
+\begin{lstlisting}
+\newcohomology\Lder{\mathbb{L}}[nopar]
+\newcohomology\Rder{\mathbb{R}}[nopar]
+\end{lstlisting}
+\newcohomology\Lder{\mathbb{L}}[nopar]
+\newcohomology\Rder{\mathbb{R}}[nopar]
+For instance, we can write
+\begin{LTXexample}
+$\Lder{\vi}{\vf}$,
+$\Rder{0}{\vf}$
+\end{LTXexample}
+
+Alternatively, the user might prefer to use keyval syntax
+on the level of the function itself (\( \vf \)~in this case).
+This can be done the following way:
+\begin{lstlisting}
+\setupclass{var}{
+	valuekeys={
+		{Lder} {
+			innerreturn,leftreturn,
+			symbolputleft=\noexpand\mathbb{L}^{#1},
+		},
+		{Rder} {
+			innerreturn,leftreturn,
+			symbolputleft=\noexpand\mathbb{R}^{#1},
+		},
+	},
+	novaluekeys={
+		{Lder} {
+			innerreturn,leftreturn,
+			symbolputleft=\noexpand\mathbb{L},
+		},
+		{Rder} {
+			innerreturn,leftreturn,
+			symbolputleft=\noexpand\mathbb{R},
+		},
+	},
+}
+\end{lstlisting}
+\setupclass{var}{
+	valuekeys={
+		{Lder} {
+			innerreturn,leftreturn,
+			symbolputleft=\noexpand\mathbb{L}^{#1},
+		},
+		{Rder} {
+			innerreturn,leftreturn,
+			symbolputleft=\noexpand\mathbb{R}^{#1},
+		},
+	},
+	novaluekeys={
+		{Lder} {
+			innerreturn,leftreturn,
+			symbolputleft=\noexpand\mathbb{L},
+		},
+		{Rder} {
+			innerreturn,leftreturn,
+			symbolputleft=\noexpand\mathbb{R},
+		},
+	},
+}
+Then the syntax becomes:
+\begin{LTXexample}
+$\vF[Lder=\vi]$,
+$\vF[Lder]{\vX[*]}$,
+$\vF[Rder]{\vX[*]}$,
+$\Hom[Rder]{\vX,\vY}$
+\end{LTXexample}
+If you get tired of having to write \lstinline!\Hom[Rder]! all
+the time, you can create a shortcut:
+\begin{lstlisting}
+\newvar\RHom[copy=\Hom,Rder]
+\end{lstlisting}
+\newvar\RHom[copy=\Hom,Rder]
+The \lstinline!copy! key is like the \lstinline!parent! key,
+except it allows you to inherit the settings from an \emph{object} rather than a \emph{class}. Notice that we did not specify a symbol; the symbol argument is optional, and in this case, it was unnecessary, as the symbol was inherited from~\lstinline!\Hom!. Let us see it in action:
+\begin{LTXexample}
+$\RHom{\vX,\vY}$
+\end{LTXexample}
+
+\section{Keyval syntax in arguments (Example: Cohomology with coefficients)}
+
+\setupclass{var}{
+	argvaluekeys={
+		{coef}{ sep={;}{#1}  },
+	},
+}
+
+Imagine we want to do cohomology with coefficients in some ring~\( \vR \).
+It is common to write this as~\( \co{*}{\vX,coef=\vR} \)
+with a semicolon instead of a comma. This can be implemented, too, with the syntax
+\begin{LTXexample}
+$\co{*}{\vX,coef=\vR}$
+\end{LTXexample}
+This shows that arguments of functions also support keyval syntax.
+In order to customize this, there are two extra keys:
+\begin{center}
+\lstinline!argnovaluekeys!
+\qquad\qquad\text{and}\qquad\qquad
+\lstinline!argvaluekeys!
+\end{center}
+These work exactly like \lstinline!novaluekeys! and~\lstinline!valuekeys!.
+\begin{lstlisting}
+\setupclass{var}{
+	argvaluekeys={
+		{coef}{ sep={;}{#1}  },
+	},
+}
+\end{lstlisting}
+(But it will not quite work yet -- stay tuned for a moment!)
+The key \lstinline!sep! is a key that controls the separator
+between the current argument and the previous argument (it will only be printed if there was a previous argument). By default, this separator is a comma. So in the syntax~\lstinline!\co{*}{\vX,coef=\vR}!,
+there are two arguments, \lstinline!\vX! and~\lstinline!\vR!, and the separator is a semicolon.
+
+However, even with the above setup, the notation \lstinline!\co{*}{\vX,coef=\vR}! will not work
+just yet. For the keys you define using \lstinline!argvaluekeys!
+are turned off by default. To turn them on for the object~\lstinline!\co!, run the following code:
+\begin{lstlisting}
+\setupobject\co{
+	valuekeys={
+		{arg}{argwithkeyval={#1}},
+	},
+}
+\end{lstlisting}
+The reason the keys are turned off by default is that keys in arguments that support values are only used in very rare cases, like cohomology with coefficients. If such keys were turned on in general, it would mess up
+every occurrence of an equality sign in arguments, and the following
+would not work:
+\begin{LTXexample}
+$\Hom[\sheafO[\vU]]{
+	\sheafF[res=\vU],
+	\sheafG[res=\vU]
+}$
+\end{LTXexample}
+
+It should be noted that there are several predefined
+keys (of type \mbox{\lstinline!novaluekey!)} which are defined on the level
+of the class \lstinline!semantexvariable!. The full list is:\fxfatal{Finish this}
+
+\begin{itemize}
+	\item slot, \ldots
+\end{itemize}
+
+We should also talk about the \lstinline!arg! key.
+
+\section{The \texttt{binary} class type (Example: Derived tensor products and fibre products)}
+
+\newbinaryclass{binaryoperator}[
+	novaluekeys={
+		{Lder}{upper=L},
+		{Rder}{upper=R},
+	},
+	mathbin, % this makes sure that the output is wrapped in \mathbin
+]
+
+\newbinaryoperator\tens{\otimes}[
+	novaluekeys={
+		{der}{Lder},
+	},
+]
+
+\newbinaryoperator\fibre{\times}[
+	% Americans are free to call it \fiber instead
+	novaluekeys={
+		{der}{Rder},
+	},
+]
+
+The \semantex system has facilities for printing tensor products~\( \tens \) as well as derived tensor products~\( \tens[der] \).
+For this, we need the \lstinline!binary! class type.
+This has exactly the same syntax as the \lstinline!variable!
+class type, except that it cannot take an argument. In other words,
+its syntax is
+\begin{lstlisting}
+\command[options]
+\end{lstlisting}
+Let us try to use it to define tensor products and fibre products:
+\begin{lstlisting}
+\newbinaryclass{binaryoperator}[
+	novaluekeys={
+		{Lder}{upper=L},
+		{Rder}{upper=R},
+	},
+	mathbin,
+	% this makes sure that the output is wrapped in \mathbin
+]
+
+\newbinaryoperator\tens{\otimes}[
+	novaluekeys={
+		{der}{Lder},
+	},
+]
+
+\newbinaryoperator\fibre{\times}[
+	% Americans are free to call it \fiber instead
+	novaluekeys={
+		{der}{Rder},
+	},
+]
+\end{lstlisting}
+As you see, this is one of the few cases where I recommend adding keyval
+syntax on the level of subclasses. Also, notice that it does not have any~\lstinline!parent=var!, as I do not really see any reason to inherit all the keyval syntax from the \lstinline!var!~class.
+Now we first define keys \lstinline!Lder! and~\lstinline!Rder! for left and right derived binary operators. Next, we build in a shortcut in both \lstinline!\tens! and~\lstinline!\fibre!
+so that we can write simply~\lstinline!der! and get the correct notion of derived functor. Let us see it in action:
+\begin{LTXexample}
+$\vA \tens \vB$,
+$\vX[*] \tens[\vR] \vY[*]$
+$\vk \tens[\vA,der] \vk$,
+$\vX \fibre[\vY,der] \vX$
+\end{LTXexample}
+
+\chapter{The \texorpdfstring{\texttt{$\backslash$⟨classname⟩}}{classname} command}
+
+So far, we have learned that every mathematical entity should be treated
+as an object of some class. However, then we run into issues the moment we
+want to write expressions like
+\[
+	\var{\vf\circ\vg}[spar,der=\vn]{\vx}.
+\]
+We do not want to have to define a new variable
+with symbol~\( \vf\circ\vg \) in order to write something like this.
+Fortunately, once you have created the class~\lstinline!var!,
+you get an extra command~\lstinline!\var! that has the following syntax
+\begin{lstlisting}
+\var{symbol}[options]{argument}
+\end{lstlisting}
+In other words, it allows you to create a variable on the spot and give in an arbitrary symbol. So the above equation can be written
+\begin{LTXexample}
+$\var{\vf\circ\vg}[
+	spar,der=\vn]{\vx}$
+\end{LTXexample}
+More generally, whenever you create a class with name \lstinline!⟨classname⟩!, you automatically get a command
+named~\lstinline!\⟨classname⟩!.
+It has the same input syntax as the class in question,
+except that, as above, the first argument is the symbol:
+\begin{lstlisting}
+\⟨classname⟩{symbol}⟨usual syntax of class⟩
+\end{lstlisting}
+
+Actually, now might be the right time to reveal that the low-level machinery in \semantex does not actually see the difference between an object and a class. Yep, this is how it has been implemented, and there are probably some object-oriented purists who will say that this goes against some general programming philosophy nonsense. So when you create the class \lstinline!⟨classname⟩!, you really create the above object which has a special syntax. And now all other objects of that class simply inherit from this object. (As we saw from above, you can actually inherit from any object; you just write~\lstinline!copy=\objectname! instead of using \lstinline!parent!.)
+
+\chapter{Class types}
+
+The \semantex system uses several different \emph{class types}.
+We have been almost exclusively using the \lstinline!variable! class type (which is by far the most important one), but in the last section, we were introduced to the \lstinline!cohomology! and the \lstinline!binary! class types.
+
+In fact, all class types are identical internally; the low-level machinery of \semantex does not \enquote{know} what type a class has.
+The only difference between the class types is the \emph{input syntax}.
+In other words, it determines which arguments an object of that class
+can take. The syntax for creating new objects
+also varies.
+
+The current implementation has the following
+class types:
+
+\begin{itemize}
+	\item \lstinline!variable!:
+	A new class is declared with the
+	syntax
+	\begin{lstlisting}
+		\newvariableclass{⟨classname⟩}[options]
+	\end{lstlisting}
+	A new object is declared by
+	\begin{lstlisting}
+		\new⟨classname⟩\⟨objectname⟩{symbol}[options]
+	\end{lstlisting}
+	The syntax for this object is
+	\begin{lstlisting}
+		\⟨objectname⟩[options]{argument}
+	\end{lstlisting}
+	\item \lstinline!cohomology!:
+	A new class is declared with the
+	syntax
+	\begin{lstlisting}
+		\newcohomologyclassclass{⟨classname⟩}[options]
+	\end{lstlisting}
+	A new object is declared by
+	\begin{lstlisting}
+		\new⟨classname⟩\⟨objectname⟩{symbol}[options]
+	\end{lstlisting}
+	The syntax for this object is
+	\begin{lstlisting}
+		\⟨objectname⟩[options]{degree}{argument}
+	\end{lstlisting}
+	\item \lstinline!binary!:
+	A new class is declared with the
+	syntax
+	\begin{lstlisting}
+		\newdelimiterclass{⟨classname⟩}[options]
+	\end{lstlisting}
+	A new object is declared by
+	\begin{lstlisting}
+		\new⟨classname⟩\⟨objectname⟩{left bracket}{right bracket}[options]
+	\end{lstlisting}
+	The syntax for this object is
+	\begin{lstlisting}
+		\⟨objectname⟩[options]{argument}
+	\end{lstlisting}
+	\item \lstinline!delimiter!:
+	A new class is declared with the syntax
+	\begin{lstlisting}
+		\newtupleclass{⟨classname⟩}[options]
+	\end{lstlisting}
+	A new object is declared by
+	\begin{lstlisting}
+		\new⟨classname⟩\⟨objectname⟩{left bracket}{right bracket}[options]
+	\end{lstlisting}
+	The syntax for this object is
+	\begin{lstlisting}
+		\⟨objectname⟩[options]{argument}
+	\end{lstlisting}
+\end{itemize}
+
+Let me add that \semantex uses a very clear separation between the input syntax and the underlying machinery. Because of this, if the user needs a different kind of class type, it is not very hard to create one. You must simply open the source code of \semantex, find the class you want to modify, and then copy the definition of the command~\lstinline!\new⟨class type⟩class! and modify it in whatever way you want.
+
+\chapter{The \texorpdfstring{\texttt{delimiter}}{delimiter} class type}
+
+\newdelimiterclass{delim}[parent=var]
+\newdelim\norm{\lVert}{\rVert}
+\newdelim\inner{\langle}{\rangle}
+
+Delimiters are what they sound like: functions like \( \norm{slot} \) and~\( \inner{slot,slot} \)
+that are defined using brackets only. Let us define a class of type delimiter:
+\begin{lstlisting}
+\newdelimiterclass{delim}[parent=var]
+\end{lstlisting}
+Now we get a command \lstinline!\newdelim! with the following syntax:
+\begin{lstlisting}
+\newdelim\⟨objectname⟩{left bracket}{right bracket}[options]
+\end{lstlisting}
+Now we can do the following:
+\begin{lstlisting}
+\newdelim\norm{\lVert}{\rVert}
+\newdelim\inner{\langle}{\rangle}
+\end{lstlisting}
+Indeed:
+\begin{LTXexample}
+$\norm{\va}$,
+$\inner{\va,\vb}$,
+$\inner{slot,slot}$
+\end{LTXexample}
+We can also use it for more complicated constructions, like sets.
+\begin{lstlisting}
+\newcommand\where{
+	\nonscript\:
+	\semantexdelimsize\vert
+	\allowbreak
+	\nonscript\:
+	\mathopen{}
+}
+
+\newdelim\Set{\lbrace}{\rbrace}[
+	prearg={\,},postarg={\,},
+	% adds \, inside {...}, as recommended by D. Knuth
+	valuekeys={
+		{arg}{argwithoutkeyval={#1}},
+		% this turns off all keyval syntax in the argument
+	}
+]
+\end{lstlisting}
+\newcommand\where{
+	\nonscript\:
+	\semantexdelimsize\vert
+	\allowbreak
+	\nonscript\:
+	\mathopen{}
+}
+
+\newdelim\Set{\lbrace}{\rbrace}[
+	prearg={\,},postarg={\,},
+	% adds \, inside {...}, as recommended by D. Knuth
+	valuekeys={
+		{arg}{argwithoutkeyval={#1}},
+		% this turns off all keyval syntax in the argument
+	}
+]
+Now you can use
+\begin{LTXexample}
+$\Set{ \vx \in \vY \where
+\vx \ge 0 }$
+\end{LTXexample}
+Don't forget that anything created with \semantex
+outputs as a variable-type object. So you can do stuff like
+\begin{LTXexample}
+$\Set{
+	\vx \in \vY[\vi]
+	\where
+	\vx \ge 0
+}[conj,\vi\in\vI]$
+\end{LTXexample}
+
+
+Tuple-like commands are also possible:
+\begin{lstlisting}
+\newdelim\tup{(}{)} % tuples
+\newdelim\pcoor{[}{]}[ % projective coordinates
+	argsep=\mathpunct{:}, % changes the argument separator to :
+	argdots=\cdots, % changes what is inserted if you write "..."
+]
+\end{lstlisting}
+\newdelim\tup{(}{)} % tuples
+\newdelim\pcoor{[}{]}[ % projective coordinates
+	argsep=\mathpunct{:}, % changes the argument separator to :
+	argdots=\cdots, % changes what is inserted if you write "..."
+]
+Let us see them in action:
+\begin{LTXexample}
+$\tup{\va,\vb,...,\vz}$,
+$\pcoor{\va,\vb,...,\vz}$
+\end{LTXexample}
+
+One can also use tuples for other, less obvious purposes, like calculus differentials:
+\begin{lstlisting}
+\newdelimiterclass{calculusdifferential}[
+	parent=var,
+	argvaluekeys={
+		{default}{standardsep={d\!#1}},
+	},
+	argdots=\cdots,
+	ifpar=false,
+]
+	
+\newcalculusdifferential\intD{(}{)}[argsep={\,},iffirstarg=false]
+
+\newcalculusdifferential\wedgeD{(}{)}[argsep=\wedge]
+\end{lstlisting}
+\newdelimiterclass{calculusdifferential}[
+	parent=var,
+	argvaluekeys={
+		{default}{standardsep={d\!#1}},
+	},
+	argdots=\cdots,
+	ifpar=false,
+]
+	
+\newcalculusdifferential\intD{(}{)}[argsep={\,},iffirstarg=false]
+
+\newcalculusdifferential\wedgeD{(}{)}[argsep=\wedge]
+
+\begin{LTXexample}
+$\int \vf \intD{\vx[1],\vx[2],...,\vx[n]}$,
+
+$\int \vf \wedgeD{\vx[1],\vx[2],...,\vx[n]}$
+\end{LTXexample}
+
+\chapter{The \texttt{execute} and \texttt{parseoptions} keys}
+
+As you can see above, \semantex has a ``waterfall-like'' behaviour. It parses keys in the order it receives them. This works fine most of the time, but for some more complicated constructions, it is useful to be able to provide a data set in any order and have them printed in a fixed order. For this purpose, we have the \lstinline!execute! and \lstinline!parseoptions!~keys.
+
+\newvar\Mat{\operatorname{Mat}}[
+	execute={
+		\semantexdataprovide{rows}
+		\semantexdataprovide{columns}
+	},
+	valuekeys={
+		{rows}{
+			execute={
+				\semantexdataset{rows}{#1}
+			},
+		},
+		{columns}{
+			execute={
+				\semantexdataset{columns}{#1}
+			},
+		},
+	},
+	parseoptions={
+		execute={
+			\semantexstrifeq{\semantexdatagetexpnot{columns}}{\semantexdatagetexpnot{rows}}
+			{
+				\semantexsetkeysx{
+					lower={
+						\semantexdatagetexpnot{columns}
+					}
+				}
+			}
+			{
+				\semantexsetkeysx{
+					lower={
+						\semantexdatagetexpnot{rows}
+						\times
+						\semantexdatagetexpnot{columns}
+					}
+				}
+			}
+		},
+	},	
+]
+
+Suppose we want to be able to write the set of \( \vn \times \vm \)-matrices with entries in~\( \vk \) as~\( \Mat[rows=\vn,columns=\vm]{\vk} \). We can in principle do the following:
+\begin{LTXexample}
+$ \Mat[\vn\times\vm]{\vk} $.
+\end{LTXexample}
+However, this is not quite as systematic and semantic as we might have wanted. Indeed, what if later you would like to change the notation to~\( \Mat[\vn,\vm]{\vk} \)?
+Therefore, we do something like the following instead (we explain the notation below):
+\begin{lstlisting}
+\newvar\Mat{\operatorname{Mat}}[
+	execute={
+		\semantexdataprovide{rows}
+		\semantexdataprovide{columns}
+		 % provides data sets for number of rows and columns
+		 % for this object
+	},
+	valuekeys={
+		{rows}{
+			execute={
+				\semantexdataset{rows}{#1}
+			},
+		},
+		{columns}{
+			execute={
+				\semantexdataset{columns}{#1}
+			},
+		},
+	},
+	parseoptions={
+		execute={
+			\semantexstrifeq{\semantexdatagetexpnot{columns}}
+			{\semantexdatagetexpnot{rows}}
+			% tests if rows = columns
+			{
+				\semantexsetkeysx{
+					lower={
+						\semantexdatagetexpnot{columns}
+					}
+				}
+			}
+			{
+				\semantexsetkeysx{
+					lower={
+						\semantexdatagetexpnot{rows}
+						\times
+						\semantexdatagetexpnot{colums}
+					}
+				}
+			}
+		},
+	},	
+]
+\end{lstlisting}
+Now we can do the following:
+\begin{LTXexample}
+$ \Mat[rows=\vn,columns=\vm]{\vk} $, $ \Mat[rows=\vn,columns=\vn]{\vk} $
+\end{LTXexample}
+
+The key~\lstinline!execute! is a key that basically just executes code. You can in principle write any \TeX\ code there, and it will be applied right at the spot. However, inside the \lstinline!execute!~key, you can also use the following locally defined commands. These can be used to handle the data that is associated with the object in question:
+\begin{lstlisting}
+\semantexdataprovide{name} % provides a data set with this name
+\semantexdataset{name}{value} % sets the data set
+\semantexdatasetx{name}{value} % sets the data set, but fully expands the argument
+\semantexdataputright{name}{value} % adds something to the right of the data set
+\semantexdataputrightx{name}{value} % the same, but fully expands first
+\semantexdataputleft{name}{value} % adds something to the left of the data set
+\semantexdataputleftx{name}{value} % the same, but fully expands first
+\semantexdataget{name}{value} % outputs the data set
+\semantexdatagetexpnot{name}{value} % outputs the data set wrapped in a \noexpand
+\semantexdataclear{name} % clears the data set
+\semantexsetkeys{keys} % sets keys
+\semantexsetkeysx{keys} % sets keys after expanding
+\semantexstrifeq{str1}{str2}{if true}{if false} % tests if str1 = str2
+\semantexboolprovide{name} % provides a boolean
+\semantexboolsettrue{name} % sets the boolean to true
+\semantexboolsetfalse{name} % sets the boolean to false
+\semantexboolif{name}{if true}{if false} % tests the boolean
+\end{lstlisting}
+
+The key~\lstinline!parseoptions! is a key that is executed right before rendering the object.  This is where you write whatever the system is supposed to \emph{do} with the data sets you provide.
+
+\chapter{Bugs}
+
+The most important current (known) bug happens if you create a variable whose symbol is a mathematical operator. For instance, write
+\begin{lstlisting}
+\newvar\Int{\int}
+\end{lstlisting}
+\newvar\Int{\int}
+
+\begin{LTXexample}
+$\int$ \\
+$\Int$ \\
+See the difference: \rlap{$\int$}$\Int$
+\end{LTXexample}
+It turns out to be equivalent to the difference between
+\lstinline!$\int$! and~\lstinline!${}\int$!. In other words, this~\lstinline!{}!
+affects the spacing a tiny bit.
+I more or less know where this bug appears, but cannot really solve it without breaking the expansion somewhere else. Suggestions and advice are more than welcome! Then again, even if it affects the spacing a little bit, it still looks fine, only a bit different. 
+
+%\input{testground}
+
+\end{document}
\ No newline at end of file


Property changes on: trunk/Master/texmf-dist/doc/latex/semantex/semantex.tex
___________________________________________________________________
Added: svn:eol-style
## -0,0 +1 ##
+native
\ No newline at end of property
Added: trunk/Master/texmf-dist/tex/latex/semantex/semantex.sty
===================================================================
--- trunk/Master/texmf-dist/tex/latex/semantex/semantex.sty	                        (rev 0)
+++ trunk/Master/texmf-dist/tex/latex/semantex/semantex.sty	2020-05-31 21:11:43 UTC (rev 55363)
@@ -0,0 +1,3101 @@
+\RequirePackage{expl3,xparse}
+\ProvidesExplPackage{semantex}{2020/05/30}{0.1alpha}{}
+% IMPORTANT:
+
+% Because of the definition of \semantexnormalscaling, the package now requires amsmath
+
+% Think about changing “upper” etc. into “supper”, whereas what is now
+% “upper” could be called “uppernosep” or something similar.
+
+% Fix left sub- and superscripts, e.g. the right spacing
+
+% Allow “.” (nothing) as delimiter, even in the case of normal or \big etc
+
+% Instead of checking if you are equal to semantexvarible when doing
+% inheritance, check if you are your own parent. This allows multiple
+% “primitive” classes.
+% Also remove commands like \newsemantexvariable etc.
+% in order to force people to create their own classes
+
+% Create 2valuekeys, 3valuekeys etc.
+
+% Test if \exp_not:n can be removed in #1 (=\keyvalue) if 
+% another \exp_not:n is added in the data manipulation commands.
+
+% Build groups and \ext_args:NV around the definition of
+% \l_semantex_key_value_temp in order to only
+% define this command locally.
+
+% Allow two keys, nopar and absolutelynopar. The difference is that
+% nopar becomes par if there is more than one argument
+
+% Allow left arguments!
+
+
+% LIST OF BUGS:
+
+%IM A change has been made in catlimits. It shows the existence of a
+%IM kind of bug in semantex
+
+%IM Removed \!\!\!\! in catlimits
+
+
+\msg_new:nnnn { semantex } { keyval_not_found } {  Unknown~key~#1~passed~to~object~#2~on~input~line~\msg_line_number: } {}
+
+\msg_new:nnnn { semantex } { arg_valuekey_not_found } { Unknown~argument~key~#1~passed~to~object~#2~on~input~line~\msg_line_number: } {}
+
+\msg_new:nnnn { semantex } { tl_not_found } { Unknown~data~#1~passed~to~object~#2~on~input~line~\msg_line_number: } {}
+%IM should be changed so that this is passed to the actual object, not 
+%IM the parent object, e.g., by having a third argument containing the
+%IM actual object in \g_semantex_data_tl_get:nn
+
+
+\msg_new:nnnn { semantex } { parent_not_found } { Unknown~class~#1~set~as~parent~of~object~#2~on~input~line~\msg_line_number: } {}
+
+\msg_new:nnnn { semantex } { data_tl_not_found } {  Unknown~data~#1~passed~to~object~#2~on~input~line~\msg_line_number: } {}
+
+% Extra cs variants we need:
+
+\cs_generate_variant:Nn \keyval_parse:NNn { cco }
+\cs_generate_variant:Nn \tl_if_blank:nTF { vTF }
+
+\tl_set:Nn \semantexbullet {\raisebox{-0.25ex}{\scalebox{1.2}{$\cdot$}}}
+\tl_set:Nn \semantexdoublebullet {\semantexbullet\semantexbullet}
+
+\tl_set:Nn \semantexslot { \mathord{-} }
+
+
+
+
+
+\DeclareDocumentCommand\newbinaryclass{mO{}} % new binary-type class
+{
+	% #1 = class name
+	% #2 = options
+	\semantexnewclass { #1 } { #2 }
+	\exp_args:Nc\DeclareDocumentCommand{#1}{mo}{
+		% the actual \#1 command
+		\IfValueTF{##2}
+		{
+			\semantexrenderclass { #1 } { ifoutput=true, symbol = { ##1 }, ##2 }
+		}
+		{
+			\semantexrenderclass { #1 } { symbol = { ##1 } }
+		}
+	}
+	\exp_args:Nc\DeclareDocumentCommand{#1withoptions}{mmo}{
+		\IfValueTF{##3}
+		{
+			\semantexrenderclass { #1 } { ifoutput=true, symbol = { ##2 }, ##1, ##3 }
+		}
+		{
+			\semantexrenderclass { #1 } { symbol = { ##2 },  ##1 }
+		}
+	}
+	\exp_args:Nc\DeclareDocumentCommand{new#1}{mgO{}}
+	{
+		% the command for creating a new object of class #1
+		% ##1 = command name, with backslash
+		% ##2 = symbol
+		% ##3 = options
+		\IfValueTF{##2}
+		{
+			\semantexnewobject { #1 } ##1 { parent = #1, symbol = { ##2 }, ##3 }
+		}
+		{
+			\semantexnewobject { #1 } ##1 { parent = #1, ##3 }
+		}
+		% create the object with name ##1
+		\DeclareDocumentCommand{##1}{o}{
+		% the actual \##1 command
+			\IfValueTF { ####1 }
+			{
+				\semantexrenderobject { ##1 } { ifoutput=true,####1 }
+			}
+			{
+				\semantexrenderobject { ##1 } { }
+			}
+		}
+	}
+}
+
+%IM Consider using \semantexIfNoValueOrDotTF on the argument
+
+\DeclareDocumentCommand\newvariableclass{mO{}} % new variable-type class
+{
+	% #1 = class name
+	% #2 = options
+	\semantexnewclass { #1 } { #2 }
+	\exp_args:Nc\DeclareDocumentCommand{#1}{mog}{
+		% the actual \#1 command
+			\IfValueTF { ##2 }
+			{
+				\IfValueTF { ##3 }
+				{
+					\semantexrenderclass { #1 } { ifoutput=true,symbol={##1},##2,arg={##3} }
+				}
+				{
+					\semantexrenderclass { #1 } { ifoutput=true,symbol={##1},##2}
+				}
+			}
+			{
+				\IfValueTF { ##3 }
+				{
+					\semantexrenderclass { #1 } { ifoutput=true,symbol={##1},arg={##3} }
+				}
+				{
+					\semantexrenderclass { #1 } { symbol={##1} }
+				}
+			}
+	}
+	\exp_args:Nc\DeclareDocumentCommand{#1withoptions}{mmog}{
+		\IfValueTF { ##3 }
+		{
+			\IfValueTF { ##4 }{
+				\semantexrenderclass { #1 } { ifoutput=true,symbol={##2}, ##1, ##3,arg={##4} }
+			}
+			{
+				\semantexrenderclass { #1 } { ifoutput=true,symbol={##2}, ##1, ##3 }
+			}
+		}
+		{
+			\IfValueTF { ##4 }
+			{
+				\semantexrenderclass { #1 } { ifoutput=true,symbol={##2}, ##1,arg={##4} }
+			}
+			{
+				\semantexrenderclass { #1 } { symbol={##2}, ##1 }
+			}
+		}
+	}
+	\exp_args:Nc\DeclareDocumentCommand{new#1}{mgO{}}
+	{
+		% the command for creating a new object of class #1
+		% ##1 = command name, with backslash
+		% ##2 = symbol
+		% ##3 = options
+		\IfValueTF{##2}
+		{
+			\semantexnewobject { #1 } ##1 { parent = #1, symbol = { ##2 }, ##3 }
+		}
+		{
+			\semantexnewobject { #1 } ##1 { parent = #1, ##3 }
+		}
+		% creates the object with name ##1
+		\DeclareDocumentCommand{##1}{og}{
+		% the actual \##1 command
+			\IfValueTF{####1}{
+				\IfValueTF{####2}
+				{
+					\semantexrenderobject { ##1 } { ifoutput=true,####1, arg={####2} }
+				}
+				{
+					\semantexrenderobject { ##1 } { ifoutput=true,####1}
+				}
+			}
+			{
+				\IfValueTF{####2}
+				{
+					\semantexrenderobject { ##1 } { ifoutput=true,arg={####2} }
+				}
+				{
+					\semantexrenderobject { ##1 } {}
+				}
+			}
+		}
+	}
+}
+
+\DeclareDocumentCommand\newcohomologyclass{mO{}} % new cohomology-type class
+% The intention is to phase this out; use variable type instead,
+%for the sake of consistency in notation.
+{
+	% #1 = class name
+	% #2 = options
+	\semantexnewclass { #1 } { #2 }
+	\exp_args:Nc\DeclareDocumentCommand{#1}{mogg}{
+		% the actual \#1 command
+		\IfValueTF{##2}
+		{
+			\IfValueTF { ##3 }
+			{
+				\semantexifeqTF { ##3 }{ * }
+				{
+					\IfValueTF { ##4 }
+					{
+						\semantexrenderclass { #1 } { ifoutput=true,symbol={##1}, ##2, *, arg={##4} }
+					}
+					{
+						\semantexrenderclass { #1 } { ifoutput=true,symbol={##1}, ##2, * }
+					}	
+				}
+				{
+					\semantexifeqTF { ##3 }{ ** }
+					{
+						\IfValueTF { ##4 }
+						{
+							\semantexrenderclass { #1 } { ifoutput=true,symbol={##1}, ##2, **, arg={##4} }
+						}
+						{
+							\semantexrenderclass { #1 } { ifoutput=true,symbol={##1}, ##2, ** }
+						}
+					}
+					{
+						\IfValueTF { ##4 }
+						{
+							\semantexrenderclass { #1 } { ifoutput=true,symbol={##1}, ##2, degreedefault={##3}, arg={##4} }
+						}
+						{
+							\semantexrenderclass { #1 } { ifoutput=true,symbol={##1}, ##2, degreedefault={##3} }
+						}
+					}
+				}
+			}
+			{
+				\IfValueTF { ##4 }
+				{
+					\semantexrenderclass { #1 } { ifoutput=true,symbol={##1}, ##2, arg={##4} }
+				}
+				{
+					\semantexrenderclass { #1 } { ifoutput=true,symbol={##1}, ##2 }
+				}
+			}
+		}
+		{
+			\IfValueTF { ##3 }
+			{
+				\semantexifeqTF { ##3 }{ * }
+				{
+					\IfValueTF { ##4 }
+					{
+						\semantexrenderclass { #1 } { ifoutput=true, symbol={##1}, *, arg={##4} }
+					}
+					{
+						\semantexrenderclass { #1 } { ifoutput=true, symbol={##1}, *}
+					}
+				}
+				{
+					\semantexifeqTF { ##3 }{ ** }
+					{
+						\IfValueTF { ##4 }
+						{
+							\semantexrenderclass { #1 } { ifoutput=true,symbol={##1}, **, arg={##4} }
+						}
+						{
+							\semantexrenderclass { #1 } { ifoutput=true,symbol={##1}, ** }
+						}
+					}
+					{
+						\IfValueTF { ##4 }
+						{
+							\semantexrenderclass { #1 } { ifoutput=true,symbol={##1},  degreedefault={##3}, arg={##4} }
+						}
+						{
+							\semantexrenderclass { #1 } { ifoutput=true,symbol={##1},  degreedefault={##3} }
+						}
+					}
+				}
+			}
+			{
+				\IfValueTF { ##4 }
+				{
+					\semantexrenderclass { #1 } { ifoutput=true,symbol={##1}, arg={##4} }
+				}
+				{
+					\semantexrenderclass { #1 } { symbol={##1}, arg={##4} }
+				}
+			}
+		}
+	}
+	\exp_args:Nc\DeclareDocumentCommand{#1withoptions}{mmogg}{
+		\IfValueTF{##3}
+		{
+			\IfValueTF { ##4 }
+			{
+				\semantexifeqTF { ##4 }{ * }
+				{
+					\IfValueTF { ##5 }
+					{
+						\semantexrenderclass { #1 } { ifoutput=true,symbol={##2}, ##1, ##3, *, arg={##5} }
+					}
+					{
+						\semantexrenderclass { #1 } { ifoutput=true,symbol={##2}, ##1, ##3, * }
+					}
+				}
+				{
+					\semantexifeqTF { ##4 }{ ** }
+					{
+						\IfValueTF { ##5 }
+						{
+							\semantexrenderclass { #1 } {ifoutput=true, symbol={##2}, ##1, ##3, **, arg={##5} }
+						}
+						{
+							\semantexrenderclass { #1 } {ifoutput=true, symbol={##2}, ##1, ##3, ** }
+						}
+					}
+					{
+						\IfValueTF { ##5 }
+						{
+							\semantexrenderclass { #1 } { ifoutput=true,symbol={##2}, ##1,##3, degreedefault={##4}, arg={##5} }
+						}
+						{
+							\semantexrenderclass { #1 } { ifoutput=true,symbol={##2}, ##1,##3, degreedefault={##4} }
+						}
+					}
+				}
+			}
+			{
+				\IfValueTF { ##5 }
+				{
+					\semantexrenderclass { #1 } { ifoutput=true,symbol={##2}, ##1, ##3, arg={##5} }
+				}
+				{
+					\semantexrenderclass { #1 } { ifoutput=true,symbol={##2}, ##1, ##3 }
+				}
+			}
+		}
+		{
+			\IfValueTF { ##4 }
+			{
+				\semantexifeqTF { ##4 }{ * }
+				{
+					\IfValueTF { ##5 }
+					{
+						\semantexrenderclass { #1 } { ifoutput=true, symbol={##2} ,##1, *, arg={##5} }
+					}
+					{
+						\semantexrenderclass { #1 } { ifoutput=true, symbol={##2} ,##1, *}
+					}
+				}
+				{
+					\semantexifeqTF { ##4 }{ ** }
+					{
+						\IfValueTF { ##5 }
+						{
+							\semantexrenderclass { #1 } { ifoutput=true, symbol={##2} , ##1,  **, arg={##5} }
+						}
+						{
+							\semantexrenderclass { #1 } { ifoutput=true, symbol={##2} , ##1,  ** }
+						}
+					}
+					{
+						\IfValueTF { ##5 }
+						{
+							\semantexrenderclass { #1 } { ifoutput=true, symbol={##2}, ##1,  degreedefault={##4}, arg={##5} }
+						}
+						{
+							\semantexrenderclass { #1 } { ifoutput=true, symbol={##2}, ##1,  degreedefault={##4} }
+						}
+					}
+				}
+			}
+			{
+				\IfValueTF { ##5 }
+				{
+					\semantexrenderclass { #1 } { ifoutput=true,symbol={##2}, ##1, arg={##5} }
+				}
+				{
+					\semantexrenderclass { #1 } { symbol={##2}, ##1 }
+				}
+			}
+		}
+	}
+	\exp_args:Nc\DeclareDocumentCommand{new#1}{mgO{}}
+	{
+		% the command for creating a new object of class #1
+		% ##1 = command name, with backslash
+		% ##2 = symbol
+		% ##3 = options
+		\IfValueTF{##2}
+		{
+			\semantexnewobject { #1 } { ##1 }{ parent = #1, symbol = { ##2 }, ##3 }
+		}
+		{
+			\semantexnewobject { #1 } { ##1 }{ parent = #1, ##3 }
+		}
+		% creates the object with name ##1
+		\DeclareDocumentCommand{##1}{ogg}{
+			% the actual \##1 command
+			\IfValueTF{####1}
+			{
+				\IfValueTF{####2}
+				{
+					\semantexifeqTF { ####2 } { * }
+					{
+						\IfValueTF{####3}
+						{
+							\semantexrenderobject { ##1 } {  ifoutput=true,####1, *, arg={ ####3 } }
+						}
+						{
+							\semantexrenderobject { ##1 } {  ifoutput=true,####1, * }
+						}
+					}
+					{
+						\semantexifeqTF { ####2 } { ** }
+						{
+							\IfValueTF{####3}
+							{
+								\semantexrenderobject { ##1 } { ifoutput=true, ####1, **, arg={ ####3 } }
+							}
+							{
+								\semantexrenderobject { ##1 } { ifoutput=true, ####1, ** }
+							}
+						}
+						{
+							\IfValueTF{####3}
+							{
+								\semantexrenderobject { ##1 } {  ifoutput=true,####1, degreedefault={ ####2 }, arg={ ####3 } }
+							}
+							{
+								\semantexrenderobject { ##1 } {  ifoutput=true,####1, degreedefault={ ####2 } }
+							}
+						}
+					}
+				}
+				{
+					\IfValueTF{####3}
+					{
+						\semantexrenderobject { ##1 } {  ifoutput=true,####1, arg={ ####3 } }
+					}
+					{
+						\semantexrenderobject { ##1 } {  ifoutput=true,####1 }
+					}
+				}
+			}
+			{
+				\IfValueTF{####2}
+				{
+					\semantexifeqTF { ####2 } { * }
+					{
+						\IfValueTF{####3}
+						{
+							\semantexrenderobject { ##1 } { ifoutput=true, *, arg={ ####3 } }
+						}
+						{
+							\semantexrenderobject { ##1 } { ifoutput=true, * }
+						}
+					}
+					{
+						\semantexifeqTF { ####2 } { ** }
+						{
+							\IfValueTF{####3}
+							{
+								\semantexrenderobject { ##1 } {   ifoutput=true,**, arg={ ####3 } }
+							}
+							{
+								\semantexrenderobject { ##1 } {   ifoutput=true,** }
+							}
+						}
+						{
+							\IfValueTF{####3}
+							{
+								\semantexrenderobject { ##1 } { ifoutput=true,degreedefault={ ####2 }, arg={ ####3 } }
+							}
+							{
+								\semantexrenderobject { ##1 } { ifoutput=true,degreedefault={ ####2 } }
+							}
+						}
+					}
+				}
+				{
+					\IfValueTF{####3}
+					{
+						\semantexrenderobject { ##1 } { ifoutput=true, arg={ ####3 } }
+					}
+					{
+						\semantexrenderobject { ##1 } { }
+					}
+				}
+			}
+		}
+	}
+}
+
+
+%\DeclareDocumentCommand\newtupleclass{mO{}} % new tuple-type class
+%{
+%	% #1 = class name
+%	% #2 = options
+%	\semantexnewclass { #1 } { #2 }
+%	\exp_args:Nc\DeclareDocumentCommand{#1}{mog}{
+%		% the actual \#1 command
+%		% (maybe this does not even make sense for tuples)
+%		\IfValueTF { ##2 }
+%		{
+%			\IfValueTF { ##3 }
+%			{
+%				\semantexrenderclass { #1 }{ ifoutput=true,symbol = { ##1 },##2, arg = { ##3 } }
+%			}
+%			{
+%				\semantexrenderclass { #1 }{ ifoutput=true,symbol = { ##1 },##2 }
+%			}
+%		}
+%		{
+%			\IfValueTF { ##3 }
+%			{
+%				\semantexrenderclass { #1 }{ ifoutput=true,symbol = { ##1 }, arg = { ##3 } }
+%			}
+%			{
+%				\semantexrenderclass { #1 }{ symbol = { ##1 } }
+%			}
+%		}
+%	}
+%	\exp_args:Nc\DeclareDocumentCommand{#1withoptions}{mmog}{
+%		\IfValueTF { ##3 }
+%		{
+%			\IfValueTF { ##4 }
+%			{
+%				\semantexrenderclass { #1 }{ ifoutput=true, symbol = { ##2 }, ##1, ##3, arg = { ##4 } }
+%			}
+%			{
+%				\semantexrenderclass { #1 }{ ifoutput=true, symbol = { ##2 }, ##1, ##3 }
+%			}
+%		}
+%		{
+%			\IfValueTF { ##4 }
+%			{
+%				\semantexrenderclass { #1 }{ ifoutput=true, symbol = { ##2 }, ##1, arg = { ##4 } }
+%			}
+%			{
+%				\semantexrenderclass { #1 }{ symbol = { ##2 }, ##1 }
+%			}
+%		}
+%	}
+%	\exp_args:Nc\DeclareDocumentCommand{new#1}{mmmmmO{}}
+%	{
+%		% the command for creating a new object of class #1
+%		% ##1 = command name, with backslash
+%		% ##2 = symbol
+%		% ##3 = options
+%		\semantexnewobject { #1 } { ##1 } % creates the object with name ##1
+%		{ parent = #1, leftpar = { ##2 }, argsep = { ##3 }, rightpar = { ##4 }, argdots = { ##5 }, ##6 }
+%		\DeclareDocumentCommand{##1}{og}{
+%		% the actual \##1 command
+%			\IfValueTF{####1}
+%			{
+%				\IfValueTF { ####2 }
+%				{
+%					\semantexrenderobject { ##1 } { ifoutput=true,####1, arg = { ####2 } }
+%				}
+%				{
+%					\semantexrenderobject { ##1 } { ifoutput=true,####1 }
+%				}
+%			}
+%			{
+%				\IfValueTF { ####2 }
+%				{
+%					\semantexrenderobject { ##1 } { ifoutput=true, arg = { ####2 } }
+%				}
+%				{
+%					\semantexrenderobject { ##1 } { }
+%				}
+%			}
+%		}
+%	}
+%}
+
+\DeclareDocumentCommand\newdelimiterclass{mO{}} % new delimiter-type class
+{
+	% #1 = class name
+	% #2 = options
+	\semantexnewclass { #1 } {
+%		valuekeys={
+%			{arg}{argwithoutkeyval={\l_semantex_key_value_temp}},
+%			%Currently, using no braces around \l_semantex_key_value_temp is necessary for \semantexdelimsize to work
+%			% with par=auto
+%		},
+		#2
+	}
+	\exp_args:Nc\DeclareDocumentCommand{#1}{mog} % maybe this does not even make sense for delimiters
+	{
+		\IfValueTF { ##2 }
+		{
+			\IfValueTF { ##3 }
+			{
+				\semantexrenderclass { #1 } { ifoutput=true, symbol = { ##1 }, ##2, arg = { ##3 } }
+			}
+			{
+				\semantexrenderclass { #1 } { ifoutput=true, symbol = { ##1 }, ##2 }
+			}
+		}
+		{
+			\IfValueTF { ##3 }
+			{
+				\semantexrenderclass { #1 } { ifoutput=true, symbol = { ##1 }, arg = { ##3 } }
+			}
+			{
+				\semantexrenderclass { #1 } { symbol = { ##1 } }
+			}
+		}
+	}
+	% the actual \#1 command
+	\exp_args:Nc\DeclareDocumentCommand{#1withoptions}{mmog}
+	{
+		\IfValueTF { ##3 }
+		{
+			\IfValueTF { ##4 }
+			{
+				\semantexrenderclass { #1 } { ifoutput=true, symbol = { ##2 }, ##1, ##3, arg = { ##4 } }
+			}
+			{
+				\semantexrenderclass { #1 } { ifoutput=true, symbol = { ##2 }, ##1, ##3 }
+			}
+		}
+		{
+			\IfValueTF { ##4 }
+			{
+				\semantexrenderclass { #1 } { ifoutput=true, symbol = { ##2 }, ##1, arg = { ##4 } }
+			}
+			{
+				\semantexrenderclass { #1 } { symbol = { ##2 }, ##1 }
+			}
+		}
+	}
+	\exp_args:Nc\DeclareDocumentCommand{new#1}{mmmO{}}
+	{
+		% the command for creating a new object of class #1
+		% ##1 = command name, with backslash
+		% ##2 = symbol
+		% ##3 = options
+		\semantexnewobject { #1 } { ##1 }{ parent = #1, leftpar = { ##2 }, rightpar = { ##3 }, ##4 }
+		% creates the object with name ##1
+		\DeclareDocumentCommand{##1}{og}{
+		% the actual \##1 command
+			\IfValueTF { ####1 }
+			{
+				\IfValueTF { ####2 }
+				{
+					\semantexrenderobject { ##1 } { ifoutput=true,####1, arg = { ####2 } }
+				}
+				{
+					\semantexrenderobject { ##1 } { ifoutput=true,####1  }
+				}
+			}
+			{
+				\IfValueTF { ####2 }
+				{
+					\semantexrenderobject { ##1 } { ifoutput=true, arg = { ####2 } }
+				}
+				{
+					\semantexrenderobject { ##1 } { }
+				}
+			}
+		}
+	}
+}
+
+\cs_generate_variant:Nn \tl_if_eq:nnTF { xnTF }
+
+\cs_generate_variant:Nn \tl_if_eq:nnF { xnF }
+
+\cs_generate_variant:Nn \tl_if_eq:nnT { xnT }
+
+\DeclareDocumentCommand{\semantexifblankordotTF}{mmm}
+{
+	\tl_if_blank:nTF { #1 }
+	{	#2	}
+	{
+		\tl_if_eq:xnTF { \tl_trim_spaces:n { #1 } } { . } { #2 } { #3 }
+	} 
+}
+
+\DeclareDocumentCommand{\semantexifblankordotT}{mm}
+{
+	\tl_if_blank:nTF { #1 }
+	{	#2	}
+	{
+		\tl_if_eq:xnT { \tl_trim_spaces:n { #1 } } { . } { #2 }
+	} 
+}
+
+\DeclareDocumentCommand{\semantexifblankordotF}{mm}
+{
+	\tl_if_blank:nF { #1 }
+	{
+		\tl_if_eq:xnF { \tl_trim_spaces:n { #1 } } { . } { #2 }
+	} 
+}
+
+\cs_set_eq:NN\semantexifeqTF\tl_if_eq:nnTF
+
+\cs_set_eq:NN\semantexifeqT\tl_if_eq:nnT
+
+\cs_set_eq:NN\semantexifeqF\tl_if_eq:nnF
+
+
+
+\cs_new:Npn \g_semantex_new_class:nn#1#2{
+	% create a new class
+	% #1 = name of class
+	% #2 = standard keyval setup; the parent class by default is semantexvariable
+	\g_semantex_new_object:nnn { semantexvariable } { #1 } { #2 }
+}
+
+\cs_set_eq:NN\semantexnewclass\g_semantex_new_class:nn
+
+\seq_new:N \semantex_all_objects_seq
+\seq_put_right:Nn \semantex_all_objects_seq { semantexvariable }
+
+
+\cs_new:Npn \g_semantex_new_object:nnn#1#2#3{
+	% create new object
+	% #1 = class of command
+	% #2 = name of command, without backslash
+	% #3 = standard keyval setup
+
+	\g_semantex_data_tl_provide:nn { #2 } { parent }
+
+	\g_semantex_data_tl_set:nnn {#2 } { parent } { semantexvariable }
+
+	\cs_set:cpn { g_semantex_data_cs_#2_valuekey:nn } ##1##2 % command controlling valuekeys
+	{ \g_semantex_valuekey:nnn { ##2 } { ##1 } { #2 } }
+
+	\cs_set:cpn { g_semantex_data_cs_#2_novaluekey:n } ##1 % command controlling novaluekeys
+	{ \g_semantex_novaluekey:nn { ##1 } { #2 } }
+	
+	% Now a similar collection of keyval commands for the *argument*
+	
+	\cs_set:cpn { g_semantex_data_cs_#2_arg_valuekey:nn } ##1##2
+	{ \g_semantex_arg_valuekey:nnn { ##2 } { ##1 }{ #2 } }
+	
+	\cs_set:cpn { g_semantex_data_cs_#2_arg_novaluekey:n } ##1
+	{ \g_semantex_arg_novaluekey:nn { ##1 } { #2 } }
+
+	
+	% initially sets up the keyval interface of the object
+	\g_semantex_keys_set:nn { #2 } { parent=#1, #3 }
+	
+	\seq_put_right:Nx \semantex_all_objects_seq { #2 }
+}
+
+
+\cs_generate_variant:Nn \g_semantex_new_object:nnn { nxn }
+
+\cs_set:Npn \semantexnewobject#1#2#3
+{	\g_semantex_new_object:nxn { #1 }{ \cs_to_str:N #2 } { #3 }	}
+
+
+
+
+%-------------------------------
+
+% Commands for rendering:
+
+\tl_new:N\l__semantex_symbol_temp
+
+\cs_new_protected:Npn \g_semantex_render:nn#1#2
+{
+	% the main command for rendering an object
+	% #1 = name of object
+	% #2 = options
+	\group_begin:
+		\g_semantex_data_tl_inherit:nn { #1 } { symbol }
+		\g_semantex_keys_set:nn { #1 } { #2 }
+		\g_semantex_primitive_valuekey_parse:nn { #1 } { } % not the right place to run this?
+		\g_semantex_data_bool_get:nnTF { #1 } { output }
+		{
+			\g_semantex_primitive_valuekey_innerreturn:nn { #1 }{}
+			\g_semantex_data_bool_get:nnTF { #1 } { rightreturnbeforerender }
+			{
+				\g_semantex_primitive_valuekey_rightreturn:nn { #1 }{}
+			}
+			{
+				% do nothing
+			}
+			\tl_set:Nx\l__semantex_render_symbol_temp { \g_semantex_data_tl_get:nn { #1 } { symbol } } %IM chang to "store" solution
+			\g_semantex_data_tl_get_store:nnN { #1 } { upper_index } \l__semantex_render_upper_index_temp
+			\g_semantex_data_tl_get_store:nnN { #1 } { lower_index } \l__semantex_render_lower_index_temp
+			\g_semantex_data_tl_get_store:nnN { #1 } { upper_left_index } \l__semantex_render_upper_left_index_temp
+			\g_semantex_data_tl_get_store:nnN { #1 } { lower_left_index } \l__semantex_render_lower_left_index_temp
+			\g_semantex_data_tl_get_store:nnN { #1 } { preupper } \l__semantex_render_preupper_temp
+			\g_semantex_data_tl_get_store:nnN { #1 } { postupper } \l__semantex_render_postupper_temp
+			\g_semantex_data_tl_get_store:nnN { #1 } { prelower } \l__semantex_render_prelower_temp
+			\g_semantex_data_tl_get_store:nnN { #1 } { postlower } \l__semantex_render_postlower_temp
+			\g_semantex_data_tl_get_store:nnN { #1 } { preupperleft } \l__semantex_render_preupperleft_temp
+			\g_semantex_data_tl_get_store:nnN { #1 } { postupperleft } \l__semantex_render_postupperleft_temp
+			\g_semantex_data_tl_get_store:nnN { #1 } { prelowerleft } \l__semantex_render_prelowerleft_temp
+			\g_semantex_data_tl_get_store:nnN { #1 } { postlowerleft } \l__semantex_render_postlowerleft_temp
+			\g_semantex_data_tl_get_store:nnN { #1 } { texclass } \l__semantex_render_texclass_temp
+			\tl_set:Nx \l__semantex_render_temp
+			{
+				\exp_not:c {
+					\g_semantex_data_tl_get:nn { #1 } { output }withoptions
+				}
+				{
+					upperaddleft={\exp_not:V\l__semantex_render_upper_index_temp},
+					loweraddleft={\exp_not:V\l__semantex_render_lower_index_temp},
+					upperleftaddright={\exp_not:V\l__semantex_render_upper_left_index_temp},
+					lowerleftaddright={\exp_not:V\l__semantex_render_lower_left_index_temp},
+					preupper={\exp_not:V\l__semantex_render_preupper_temp},
+					postupper={\exp_not:V\l__semantex_render_postupper_temp},
+					prelower={\exp_not:V\l__semantex_render_prelower_temp},
+					postlower={\exp_not:V\l__semantex_render_postlower_temp},
+					preupperleft={\exp_not:V\l__semantex_render_preupperleft_temp},
+					postupperleft={\exp_not:V\l__semantex_render_postupperleft_temp},
+					prelowerleft={\exp_not:V\l__semantex_render_prelowerleft_temp},
+					postlowerleft={\exp_not:V\l__semantex_render_postlowerleft_temp},
+					texclass={\l__semantex_render_texclass_temp},
+					\g_semantex_data_tl_get_exp_not:nn { #1 } { output_options },
+				}
+				{ \exp_not:V \l__semantex_render_symbol_temp }
+			}
+		}
+		{
+			\g_semantex_primitive_valuekey_return:nn { #1 }{}
+%			\tl_set:Nx \l__semantex_render_temp { \exp_not:V \l__semantex_symbol_temp }
+%			\tl_set:Nx\l__semantex_render_temp { \g_semantex_data_tl_get:nn { #1 } { symbol } } % this is the ordinary solution that generally just works
+			%\tl_set:Nx\l__semantex_render_temp { \exp_not:n{\exp_not:v { semantex_data_tl_#1_symbol } }}
+%			\g_semantex_data_tl_get_store:nnN { #1 } { symbol } \l__semantex_render_symbol_temp
+			\tl_if_blank:xTF { \g_semantex_data_tl_get:nn { #1 } { texclass } }{
+				\tl_set:Nx\l__semantex_render_symbol_temp { \g_semantex_data_tl_get:nn { #1 } { symbol } }
+			}
+			{
+				\tl_set:Nx\l__semantex_render_symbol_temp { \g_semantex_data_tl_get:nn { #1 } { texclass } { \g_semantex_data_tl_get:nn { #1 } { symbol } } }
+			}
+			\tl_set:Nx\l__semantex_render_temp {
+				\exp_not:V \l__semantex_render_symbol_temp
+			}
+		}
+	\exp_last_unbraced:NV
+	\group_end:
+	\l__semantex_render_temp
+}
+
+\cs_set_eq:NN\semantexrenderclass\g_semantex_render:nn % a front-end command
+
+\cs_set:Npn\semantexrenderobject#1#2
+{
+	\g_semantex_render:nn { \cs_to_str:N #1 } { #2 }
+}
+
+
+
+\cs_generate_variant:Nn\tl_if_blank:nTF { xTF }
+
+\cs_new:Npn \g_semantex_right_indices:nnnnnn#1#2#3#4#5#6
+{
+	\tl_if_blank:nF { #2 } { \sp{#1 #2 #3} }
+	\tl_if_blank:nF { #5 } { \sb{#4 #5 #6} }
+	% Using x here was the source of a very long
+	% debugging; inputting underbrace in the index
+	% caused problems
+}
+
+\cs_new:Npn \g_semantex_left_indices:nnnnnn#1#2#3#4#5#6
+{
+	\tl_if_blank:nTF { #2 } {
+		\tl_if_blank:nF { #5 } { {}\sb{#4 #5 #6} }
+	}
+	{
+		{} \sp{#1 #2 #3}
+		\tl_if_blank:nF { #5 } { \sb{#4 #5 #6} }
+	}
+}
+
+
+
+\tl_new:N\semantexdelimsize
+
+%So far, this is experimental:
+%\makeatletter %this part requires amsmath
+\newcommand{\semantexnormalscaling}{\bBigg@{0.8}}
+\newcommand{\semantexnormalscalingl}{\mathopen\semantexnormalscaling}
+\newcommand{\semantexnormalscalingr}{\mathclose\semantexnormalscaling}
+\newcommand{\semantexnormalscalingm}{\mathrel\semantexnormalscaling}
+%\makeatother
+
+
+\cs_new:Npn \g_semantex_parentheses:nnnnnn#1#2#3#4#5#6
+{
+	\tl_if_blank:nF { #5 }
+	{
+		\str_case:nnF { #1 }
+		{
+			{ normal } {
+				\group_begin:
+				%\semantexnormalscalingl#2 #4 #5 #6 \semantexnormalscalingr#3
+				\mathopen#2 #4 #5 #6 \mathclose#3
+				\group_end:
+			}
+			{ auto } {
+				\group_begin:
+				\tl_set:Nn\semantexdelimsize{\middle}
+				%\tl_set_eq:NN\semantexdelimsize\middle
+				\mathopen{}\mathclose\bgroup\left#2
+				#4 #5 #6
+				\aftergroup\egroup\right#3
+				\group_end:
+			}
+			{ * } {
+				\group_begin:
+				\tl_set:Nn\semantexdelimsize{\middle}
+				%\tl_set_eq:NN\semantexdelimsize\middle
+				\mathopen{}\mathclose\bgroup\left#2
+				#4 #5 #6
+				\aftergroup\egroup\right#3
+				\group_end:
+			}
+%			{ \big } {
+%				\group_begin:
+%				\tl_set_eq:NN\semantexdelimsize\big
+%				\mathopen\big#2 #4 \mathclose\big#3
+%				\group_end:
+%			}
+%			{ \Big } {
+%				\group_begin:
+%				\tl_set_eq:NN\semantexdelimsize\Big
+%				\mathopen\Big#2 #4 \mathclose\Big#3
+%				\group_end:
+%			}
+%			{ \bigg } {
+%				\group_begin:
+%				\tl_set_eq:NN\semantexdelimsize\bigg
+%				\mathopen\bigg#2 #4 \mathclose\bigg#3
+%				\group_end:
+%			}
+%			{ \Bigg } {
+%				\group_begin:
+%				\tl_set_eq:NN\semantexdelimsize\Bigg
+%				\mathopen\Bigg#2 #4 \mathclose\Bigg#3
+%				\group_end:
+%			}
+		}
+		{
+			\group_begin:
+			\tl_set_eq:NN\semantexdelimsize#1
+			%\tl_set:Nx\semantexdelimsize{\exp_not:N#1}
+			\mathopen#1#2 #4 #5 #6 \mathclose#1#3
+			\group_end:
+		}
+	}
+}
+
+\cs_new:Npn \g_semantex_no_parentheses:nnn#1#2#3
+{
+	\tl_if_blank:nF { #2 }
+	{
+		\group_begin:
+		\tl_clear:N\semantexdelimsize
+		#1 #2 #3
+		\group_end:
+	}
+}
+
+\cs_new:Npn \g_semantex_symbol_parentheses:nnnn#1#2#3#4
+{
+	\tl_if_blank:nF { #4 }
+	{
+		\str_case:nnF { #1 }
+		{
+			{ normal } { \mathopen#2 #4 \mathclose#3 }
+			{ auto } { \mathopen{}\mathclose\bgroup\left#2 #4 \aftergroup\egroup\right#3 }
+			{ * } { \mathopen{}\mathclose\bgroup\left#2 #4 \aftergroup\egroup\right#3 }
+		}
+		{ \mathopen#1#2 #4 \mathclose#1#3 }
+	}
+}
+
+
+
+
+%--------------------------------------------
+% Commands to modify and obtain data
+
+\cs_generate_variant:Nn \str_if_eq:nnTF { fnTF , onTF }
+
+%\cs_new:Npn \g_semantex_data_tl_get_proto:nnn#1#2#3
+%{
+%	% #1 = name of object
+%	% #2 = the data to get
+%	% #3 = also the name of object, but being stored 
+%	% 	   when passing to the parent, in order to make
+%	%	   error messages meaningful
+%	\tl_if_exist:cTF { semantex_data_tl_#1_#2 }
+%	{
+%		\use:c { semantex_data_tl_#1_#2 }
+%	}
+%	{
+%		\tl_if_eq:nnTF { #1 } { semantexvariable }
+%		{
+%			\msg_error:nnnn { semantex } { data_tl_not_found } { #2 } { #3 }
+%		}
+%		{
+%			\g_semantex_data_tl_get_proto:nnn { \g_semantex_data_tl_get:nn { #1 } { parent } } { #2 } { #1 }
+%		}
+%	}
+%}
+%
+%\cs_new:Npn \g_semantex_data_tl_get:nn#1#2
+%{
+%	\g_semantex_data_tl_get_proto:nnn { #1 } { #2 } { #1 }
+%}
+
+\cs_new:Npn \g_semantex_data_tl_get:nn#1#2
+{
+	% #1 = name of object
+	% #2 = the data to get
+	% #3 = also the name of object, but being stored 
+	% 	   when passing to the parent, in order to make
+	%	   error messages meaningful
+	\tl_if_exist:cTF { semantex_data_tl_#1_#2 }
+	{
+		\use:c { semantex_data_tl_#1_#2 }
+	}
+	{
+		\g_semantex_data_tl_get:nn { \g_semantex_data_tl_get:nn { #1 } { parent } } { #2 }
+	}
+}
+
+\cs_new:Npn \g_semantex_data_tl_get_exp_not:nn#1#2
+{
+	% #1 = name of object
+	% #2 = the data to get
+	\tl_if_exist:cTF { semantex_data_tl_#1_#2 }
+	{
+		\exp_not:v { semantex_data_tl_#1_#2 }
+	}
+	{
+		\g_semantex_data_tl_get:nn { \g_semantex_data_tl_get:nn { #1 } { parent } } { #2 }
+	}
+}
+
+%\cs_generate_variant:Nn \g_semantex_data_tl_get:nn { cn }
+
+\cs_new:Npn \g_semantex_data_tl_get_store:nnN#1#2#3% maybe should be PROTECTED??
+{
+	% #1 = name of object
+	% #2 = the data to get
+	% #3 = where to store it
+	\tl_if_exist:cTF { semantex_data_tl_#1_#2 }
+	{
+		\tl_set_eq:Nc #3 { semantex_data_tl_#1_#2 }
+	}
+	{
+		\g_semantex_data_tl_get_store:nnN { \g_semantex_data_tl_get:nn { #1 } { parent } } { #2 } #3
+	}
+}
+
+\cs_generate_variant:Nn \g_semantex_data_tl_get_store:nnN { nnc }
+
+\cs_new:Npn\g_semantex_data_tl_provide:nn#1#2
+{
+	\tl_if_exist:cF { semantex_data_tl_#1_#2 }
+	{
+		\tl_set:cn { semantex_data_tl_#1_#2 } {}
+	}
+}
+
+\cs_new:Npn\g_semantex_data_tl_inherit:nn#1#2
+{
+	% #1 = object
+	% #2 = piece of token list data
+	% Takes the data #2 from the parent of #1 and saves it locally
+	% to the object #1. After this, no more inheritance is taking place
+	% from the parent, and the data can be changed locally on the level
+	% of #1.
+	\tl_if_exist:cF { semantex_data_tl_#1_#2 }
+	{
+		\g_semantex_data_tl_get_store:nnc { \g_semantex_data_tl_get:nn { #1 } { parent } } { #2 } { semantex_data_tl_#1_#2 }
+	}
+	{
+		\g_semantex_data_tl_get_store:nnc { \g_semantex_data_tl_get:nn { #1 } { parent } } { #2 } { semantex_data_tl_#1_#2 }
+		%IM could be replaced by simply { #1 } { #2 } once the check is made
+		%IM based on "if_provided"
+	}
+}
+
+\cs_new:Npn\g_semantex_data_tl_inherit_x:nn#1#2
+{
+	% The same as inherit; historically, this one did an x type
+	% expansion first, but after changes in other places, this
+	% no longer appeard to be necessary. I decided to keep up the
+	% separation of the two, just in case.
+	\tl_if_exist:cF { semantex_data_tl_#1_#2 }
+	{
+			\g_semantex_data_tl_get_store:nnc { \g_semantex_data_tl_get:nn { #1 } { parent } } { #2 } { semantex_data_tl_#1_#2 }
+	}
+	{
+		\g_semantex_data_tl_get_store:nnc { \g_semantex_data_tl_get:nn { #1 } { parent } } { #2 } { semantex_data_tl_#1_#2 }
+		%IM could be replaced by simply { #1 } { #2 } once the check is made
+		%IM based on "if_provided"
+	}
+}
+
+\cs_new:Npn \g_semantex_data_tl_set:nnn#1#2#3
+{
+	%\g_semantex_data_tl_provide:nn { #1 } { #2 }
+	\tl_set:cn { semantex_data_tl_#1_#2 } { #3 }
+}
+
+\cs_generate_variant:Nn \g_semantex_data_tl_set:nnn { nnx }
+
+\cs_new:Npn \g_semantex_data_tl_put_right:nnn#1#2#3
+{
+	\g_semantex_data_tl_inherit:nn { #1 } { #2 }
+	\tl_put_right:cn { semantex_data_tl_#1_#2 } { #3 }
+}
+
+\cs_generate_variant:Nn \g_semantex_data_tl_put_right:nnn { nnx }
+
+\cs_new:Npn \g_semantex_data_tl_put_left:nnn#1#2#3
+{
+	\g_semantex_data_tl_inherit:nn { #1 } { #2 }
+	\tl_put_left:cn { semantex_data_tl_#1_#2 } { #3 }
+}
+
+\cs_generate_variant:Nn \g_semantex_data_tl_put_left:nnn { nnx }
+
+\cs_new:Npn \g_semantex_data_tl_clear:nn#1#2
+{
+	\g_semantex_data_tl_provide:nn { #1 } { #2 }
+	\tl_clear:c { semantex_data_tl_#1_#2 }
+}
+
+\cs_new:Npn \g_semantex_data_seq_get_store:nnN#1#2#3{% maybe should be PROTECTED??
+	% #1 = name of object
+	% #2 = the sequence to get
+	% #3 = the command to store it in
+	\bool_if_exist:cTF { semantex_data_seq_#1_#2_bool_if_provided }
+	{
+		\bool_if:cTF { semantex_data_seq_#1_#2_bool_if_provided }
+		{ \seq_set_eq:Nc#3 { semantex_data_seq_#1_#2 } }
+		{ \g_semantex_data_seq_get_store:vnN{ semantex_data_tl_#1_parent }{#2}#3 }
+	}
+	{
+		\g_semantex_data_seq_get_store:nnN{ \g_semantex_data_tl_get:nn { #1 } { parent } }{#2}#3%
+	}
+}
+
+\cs_generate_variant:Nn \g_semantex_data_seq_get_store:nnN { vnN, nnc, vnc }
+
+\cs_new:Npn\g_semantex_data_seq_provide:nn#1#2
+{
+	\bool_if_exist:cTF { semantex_data_seq_#1_#2_bool_if_provided }
+	{
+		\bool_if:cF { semantex_data_seq_#1_#2_bool_if_provided }
+		{
+			\seq_new:c { semantex_data_seq_#1_#2 }
+			\bool_set_true:c { semantex_data_seq_#1_#2_bool_if_provided }
+		}
+	}
+	{
+		\bool_new:c { semantex_data_seq_#1_#2_bool_if_provided }
+		\bool_set_true:c { semantex_data_seq_#1_#2_bool_if_provided }
+		\seq_if_exist:cF { semantex_data_seq_#1_#2 } {
+			\seq_new:c { semantex_data_seq_#1_#2 }
+		}
+	}
+}
+
+\cs_new:Npn\g_semantex_data_seq_inherit:nn#1#2
+{
+	\bool_if_exist:cTF { semantex_data_seq_#1_#2_bool_if_provided }
+	{
+		\bool_if:cF { semantex_data_seq_#1_#2_bool_if_provided }
+		{
+			\g_semantex_data_seq_get_store:vnc { semantex_data_tl_#1_parent } { #2 } { semantex_data_seq_#1_#2 }
+			\bool_set_true:c { semantex_data_seq_#1_#2_bool_if_provided }
+		}
+	}
+	{
+		\bool_new:c { semantex_data_seq_#1_#2_bool_if_provided }
+		\bool_set_true:c { semantex_data_seq_#1_#2_bool_if_provided }
+		\seq_if_exist:cF { semantex_data_seq_#1_#2 } { \seq_new:c { semantex_data_seq_#1_#2 } }
+		\g_semantex_data_seq_get_store:vnc { semantex_data_tl_#1_parent } { #2 } { semantex_data_seq_#1_#2 }
+	}
+}
+
+\cs_new:Npn\g_semantex_data_seq_put_right:nnn#1#2#3
+{
+	\g_semantex_data_seq_inherit:nn { #1 } { #2 }
+	\seq_put_right:cn { semantex_data_seq_#1_#2 } { #3 }
+}
+
+\cs_new:Npn \g_semantex_data_prop_provide:nn#1#2
+{
+	% #1 = name of the object
+	% #2 = name of the prop
+	\prop_if_exist:cF { semantex_data_prop_#1_#2 } { \prop_new:c { semantex_data_prop_#1_#2 } }
+}
+
+\cs_new:Npn \g_semantex_data_prop_put:nnnn#1#2#3#4
+{
+	\prop_put:cnn { semantex_data_prop_#1_#2 } { #3 } { #4 }
+}
+
+
+\cs_new:Npn \g_semantex_valuekey_get:nnNTF#1#2#3#4#5{%
+	% #1 = name of the object
+	% #2 = keyval data to get
+	% #3 = command to store possible data in
+	% #4 = if true (not to be used)
+	% #5 = if false
+	\prop_get:cnNTF { semantex_data_prop_#1_custom_valuekeys } { #2 }#3%\l_semantex_valuekey_get_temp
+	{	#4	}
+	{
+		\tl_if_eq:nnTF { #1 } { semantexvariable }
+		{ #5 }
+		{
+			\g_semantex_valuekey_get:xnNTF { \g_semantex_data_tl_get:nn { #1 } { parent } } { #2 } #3 { #4 } { #5 }
+		}
+	}
+}
+
+\cs_generate_variant:Nn \g_semantex_valuekey_get:nnNTF { vnNTF, xnNTF }
+
+\cs_new:Npn \g_semantex_novaluekey_get:nnNTF#1#2#3#4#5{%
+	% #1 = name of the object
+	% #2 = singlekey data to get
+	% #3 = command to store possible data in
+	% #4 = if true (not to be used)
+	% #5 = if false
+	\prop_get:cnNTF { semantex_data_prop_#1_custom_novaluekeys } { #2 } #3
+	{	#4	}
+	{
+		\tl_if_eq:nnTF { #1 } { semantexvariable }
+		{ #5 }
+		{
+			\g_semantex_novaluekey_get:xnNTF { \g_semantex_data_tl_get:nn { #1 } { parent } } { #2 } #3 { #4 } { #5 }
+		}
+	}
+}
+
+\cs_generate_variant:Nn \g_semantex_novaluekey_get:nnNTF { vnNTF, xnNTF }
+
+%\cs_new:N\l_semantex_arg_valuekey_get_parent_temp
+
+\cs_new:Npn \g_semantex_arg_valuekey_get:nnNTF#1#2#3#4#5{%
+	% #1 = name of the object
+	% #2 = keyval data to get
+	% #3 = command to store possible data in
+	% #4 = if true (not to be used)
+	% #5 = if false
+	\prop_get:cnNTF { semantex_data_prop_#1_custom_arg_valuekeys } { #2 }#3%\l_semantex_valuekey_get_temp
+	{	#4	}
+	{
+		\tl_if_eq:nnTF { #1 } { semantexvariable }
+		{ #5 }
+		{
+			\g_semantex_arg_valuekey_get:xnNTF { \g_semantex_data_tl_get:nn { #1 } { parent } } { #2 } #3 { #4 } { #5 }
+		}
+	}
+}
+
+\cs_generate_variant:Nn \g_semantex_arg_valuekey_get:nnNTF { vnNTF, xnNTF }
+
+\prop_new:N\l_semantex_arg_valuekey_get_temp
+
+\cs_new:Npn \g_semantex_arg_novaluekey_get:nnNTF#1#2#3#4#5{%
+	% #1 = name of the object
+	% #2 = singlekey data to get
+	% #3 = command to store possible data in
+	% #4 = if true (not to be used)
+	% #5 = if false
+	\prop_get:cnNTF { semantex_data_prop_#1_custom_arg_novaluekeys } { #2 } #3
+	{	#4	}
+	{
+		\tl_if_eq:nnTF { #1 } { semantexvariable }
+		{ #5 } { \g_semantex_arg_novaluekey_get:xnNTF { \g_semantex_data_tl_get:nn { #1 } { parent } } { #2 } #3 { #4 } { #5 } }
+	}
+}
+
+\cs_generate_variant:Nn \g_semantex_arg_novaluekey_get:nnNTF { vnNTF, xnNTF }
+
+\cs_new:Npn\g_semantex_data_bool_get:nnTF#1#2#3#4
+{
+	% #1 = name of the object
+	% #2 = boolean to get
+	% #3 = if true
+	% #4 = if false
+	\bool_if_exist:cTF { semantex_data_bool_#1_if_#2_bool_if_provided }
+	{
+		\bool_if:cTF { semantex_data_bool_#1_if_#2_bool_if_provided }
+		{
+			\bool_if:cTF { semantex_data_bool_#1_if_#2 } { #3 } { #4 }
+		}
+		{
+			\tl_if_eq:nnTF { #1 } { semantexvariable }
+			{ #4 } { \g_semantex_data_bool_get:xnTF { \g_semantex_data_tl_get:nn { #1 } { parent } } { #2 } { #3 } { #4 } }
+		}
+	}
+	{
+		\tl_if_eq:nnTF { #1 } { semantexvariable }
+		{ #4 } { \g_semantex_data_bool_get:xnTF { \g_semantex_data_tl_get:nn { #1 } { parent } } { #2 } { #3 } { #4 } }
+	}
+}
+
+\cs_generate_variant:Nn \g_semantex_data_bool_get:nnTF { xnTF, vnTF }
+
+\cs_new:Npn\g_semantex_data_bool_provide:nn#1#2
+{
+	% #1 = name of the object
+	% #2 = boolean to provide
+	\bool_if_exist:cTF { semantex_data_bool_#1_if_#2_bool_if_provided }
+	{
+		\bool_if:cF { semantex_data_bool_#1_if_#2_bool_if_provided }
+		{	\bool_set_true:c { semantex_data_bool_#1_if_#2_bool_if_provided }	}
+	}
+	{
+		\bool_new:c { semantex_data_bool_#1_if_#2 }
+		\bool_new:c { semantex_data_bool_#1_if_#2_bool_if_provided }
+		\bool_set_true:c { semantex_data_bool_#1_if_#2_bool_if_provided }
+	}
+}
+
+\cs_new:Npn\g_semantex_data_bool_set_true:nn#1#2
+{
+	% #1 = name of the object
+	% #2 = boolean to provide
+	\g_semantex_data_bool_provide:nn { #1 } { #2 }
+	\bool_set_true:c { semantex_data_bool_#1_if_#2 }
+}
+
+\cs_new:Npn\g_semantex_data_bool_set_false:nn#1#2
+{
+	% #1 = name of the object
+	% #2 = boolean to provide
+	\g_semantex_data_bool_provide:nn { #1 } { #2 }
+	\bool_set_false:c { semantex_data_bool_#1_if_#2 }
+}
+
+\cs_new:Npn\g_semantex_data_cs_get:nnn#1#2#3
+{
+	% #1 = name of the object
+	% #2 = command sequence to get
+	% #3 = what to apply said command sequence to
+	\cs_if_exist:cTF { g_semantex_data_cs_#1_#2:n }
+	{	\use:c { g_semantex_data_cs_#1_#2:n } { #3 }	}
+	{
+		\tl_if_eq:nnTF { #1 } { semantexvariable }
+		{
+			% should probably throw an error by now, but later!
+		}
+		{
+			\g_semantex_data_cs_get:xnn { \g_semantex_data_tl_get:nn{#1}{parent} } { #2 } { #3 }
+		}
+	}
+}
+
+\cs_generate_variant:Nn \g_semantex_data_cs_get:nnn { xnn }
+
+\cs_new:Npn \g_semantex_keys_set:nn#1#2
+{
+	% #1 = object
+	% #2 = keys
+	\keyval_parse:cco %IM think about wthether o-type is really necessary.
+	{ g_semantex_data_cs_#1_novaluekey:n }
+	{ g_semantex_data_cs_#1_valuekey:nn }
+	{ #2 }
+}
+
+\cs_new:Npn \g_semantex_arg_keys_set:nn#1#2
+{
+	% #1 = object
+	% #2 = keys
+	\keyval_parse:cco %IM -||-
+	{ g_semantex_data_cs_#1_arg_novaluekey:n }
+	{ g_semantex_data_cs_#1_arg_valuekey:nn }
+	{ #2 }
+}
+
+\cs_generate_variant:Nn \clist_map_function:nN { nc }
+
+\cs_new:Npn \g_semantex_arg_novaluekeys_set:nn#1#2
+{
+	\clist_map_function:nc {#2} { g_semantex_data_cs_#1_arg_novaluekey:n }
+}
+
+\DeclareDocumentCommand\setupclass{mm}{ % a user-level command for setting up the object
+	% #1 = class
+	% #2 = setup
+	%\exp_args:Nx
+	\g_semantex_keys_set:nn { #1 }{ #2 }
+}
+
+\DeclareDocumentCommand\setupobject{mm}{%
+	% #1 = object
+	% #2 = setup
+	\g_semantex_keys_set:nn { \cs_to_str:N #1 } { #2 }
+}
+
+
+
+
+
+% Now for the commands that implement the keyval interface.
+% These commands are used by the command \g_semantex_data_cs_#1_keys_set, see
+% above.
+% There is a fixed collection of primitive commands.
+% Furthermore, the user has the option to create a collection
+% of new commands, which are all stored in the property list
+% called \semantex_data_prop_#1_custom_valuekeys
+% These valuekeys contain code that must be executable by other keys
+% (e.g., primitive ones)
+% The key value is accessible to the user via the temporary command
+% \l_semantex_key_value_temp
+
+\providecommand\semantexdataprovide{}
+\providecommand\semantexdataset{}
+\providecommand\semantexdatasetx{}
+\providecommand\semantexdataputright{}
+\providecommand\semantexdataputrightx{}
+\providecommand\semantexdataputleft{}
+\providecommand\semantexdataputleftx{}
+\providecommand\semantexdataget{}
+\providecommand\semantexdatagetexpnot{}
+\providecommand\semantexdataclear{}
+\providecommand\semantexsetkeys{}
+\providecommand\semantexsetkeysx{}
+\providecommand\semantexstrifeq{}
+\providecommand\semantexboolprovide{}
+\providecommand\semantexboolsettrue{}
+\providecommand\semantexboolsetfalse{}
+\providecommand\semantexboolif{}
+
+% CHANGE TO CAMEL CASE!
+
+
+\cs_generate_variant:Nn\str_if_eq:nnTF {xxTF,ooTF}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_execute:nn#1#2
+{
+	\renewcommand\semantexdataprovide[1]{\g_semantex_data_tl_provide:nn{#1}{##1}}
+	\renewcommand\semantexdataset[2]{\g_semantex_data_tl_set:nnn{#1}{##1}{##2}}
+	\renewcommand\semantexdatasetx[2]{\g_semantex_data_tl_set:nnx{#1}{##1}{##2}}
+	\renewcommand\semantexdataputright[2]{\g_semantex_data_tl_put_right:nnn{#1}{##1}{##2}}
+	\renewcommand\semantexdataputrightx[2]{\g_semantex_data_tl_put_right:nnx{#1}{##1}{##2}}
+	\renewcommand\semantexdataputleft[2]{\g_semantex_data_tl_put_left:nnn{#1}{##1}{##2}}
+	\renewcommand\semantexdataputleftx[2]{\g_semantex_data_tl_put_left:nnx{#1}{##1}{##2}}
+	\renewcommand\semantexdataget[1]{\g_semantex_data_tl_get:nn{#1}{##1}}
+	\renewcommand\semantexdatagetexpnot[1]{\g_semantex_data_tl_get_exp_not:nn{#1}{##1}}
+	\renewcommand\semantexdataclear[1]{\g_semantex_data_tl_clear:nn{#1}{##1}}
+	\renewcommand\semantexsetkeys[1]{\g_semantex_keys_set:nn{#1}{##1}}
+	\renewcommand\semantexsetkeysx[1]{\g_semantex_keys_set:nx{#1}{##1}}
+	\renewcommand\semantexstrifeq[4]{\str_if_eq:xxTF{##1}{##2}{##3}{##4}}
+	\renewcommand\semantexboolprovide[1]{\g_semantex_data_bool_provide:nn{#1}{##1}}
+	\renewcommand\semantexboolsettrue[1]{\g_semantex_data_bool_set_true:nn{#1}{##1}}
+	\renewcommand\semantexboolsetfalse[1]{\g_semantex_data_bool_set_false:nn{#1}{##1}}
+	\renewcommand\semantexboolif[3]{\g_semantex_data_bool_get:nnTF{#1}{##1}{##2}{##3}}
+	%\exp_not:n{#2}
+	% how about erase and forget?
+	#2
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_parse:nn#1#2
+{
+	\g_semantex_data_tl_inherit:nn { #1 } { parseoptions }
+	% But we need to also reset this, plus all data variables that
+	% it used; nope, not necessary
+	\g_semantex_keys_set:nx { #1 } {
+		\g_semantex_data_tl_get_exp_not:nn { #1 } { parseoptions }
+	}
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_parseoptions:nn#1#2
+{
+	\g_semantex_data_tl_put_right:nnn { #1 } { parseoptions } { #2 }
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_return:nn#1#2
+{
+	\g_semantex_primitive_valuekey_innerreturn:nn { #1 }{}
+	\g_semantex_primitive_valuekey_rightreturn:nn { #1 }{}
+	\g_semantex_primitive_valuekey_leftreturn:nn { #1 }{}
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_innerreturn:nn#1#2
+{
+	\g_semantex_data_tl_inherit:nn { #1 } { symbol }
+	\g_semantex_data_seq_inherit:nn { #1 } { commands_sequence }
+	\g_semantex_data_seq_get_store:nnN { #1 } { commands_sequence } \l__semantex_data_seq_commands_sequence_temp
+	%\seq_map_inline:cn { semantex_data_seq_#1_commands_sequence }
+	\seq_map_inline:Nn \l__semantex_data_seq_commands_sequence_temp
+		{
+			\g_semantex_data_tl_set:nnx { #1 } { symbol }
+			{
+				\exp_not:n {\exp_not:N ##1}  {
+					\g_semantex_data_tl_get_exp_not:nn { #1 } { symbol }
+				}
+				% This was the solution that happened to solve
+				% the expansion issues best
+			}
+		}
+	\seq_clear:c { semantex_data_seq_#1_commands_sequence }
+}
+
+\tl_new:N\l__semantex_rightreturn_par_temp
+
+\tl_new:N\l__semantex_rightreturn_nopar_temp
+
+\cs_generate_variant:Nn \g_semantex_keys_set:nn { nx , no }
+
+\cs_new:Npn\g_semantex_primitive_valuekey_rightreturn:nn#1#2
+{
+	\g_semantex_data_tl_inherit_x:nn { #1 } { upper_index }
+	\g_semantex_data_tl_inherit_x:nn { #1 } { lower_index }
+	\g_semantex_data_tl_inherit_x:nn { #1 } { preupper }
+	\g_semantex_data_tl_inherit_x:nn { #1 } { postupper }
+	\g_semantex_data_tl_inherit_x:nn { #1 } { prelower }
+	\g_semantex_data_tl_inherit_x:nn { #1 } { postlower }
+	\g_semantex_data_tl_inherit_x:nn { #1 } { arg }
+	\g_semantex_data_tl_get_store:nnN { #1 } { upper_index } \l__semantex_rightreturn_upper_index_temp
+	\g_semantex_data_tl_get_store:nnN { #1 } { lower_index } \l__semantex_rightreturn_lower_index_temp
+	\g_semantex_data_tl_get_store:nnN { #1 } { symbol } \l__semantex_rightreturn_symbol_temp
+	\g_semantex_data_tl_get_store:nnN { #1 } { preupper }
+	\l__semantex_rightreturn_preupper_temp
+	\g_semantex_data_tl_get_store:nnN { #1 } { postupper }
+	\l__semantex_rightreturn_postupper_temp
+	\g_semantex_data_tl_get_store:nnN { #1 } { prelower }
+	\l__semantex_rightreturn_prelower_temp
+	\g_semantex_data_tl_get_store:nnN { #1 } { postlower }
+	\l__semantex_rightreturn_postlower_temp	
+	\g_semantex_data_tl_set:nnx  { #1 } { symbol }
+	{
+		\exp_not:V \l__semantex_rightreturn_symbol_temp
+		% Setup indices:
+		\exp_not:N\g_semantex_right_indices:nnnnnn
+		{ \exp_not:V \l__semantex_rightreturn_preupper_temp }
+		{ \exp_not:V \l__semantex_rightreturn_upper_index_temp }
+		{ \exp_not:V \l__semantex_rightreturn_postupper_temp }
+		{ \exp_not:V \l__semantex_rightreturn_prelower_temp }
+		{ \exp_not:V \l__semantex_rightreturn_lower_index_temp }
+		{ \exp_not:V \l__semantex_rightreturn_postlower_temp }
+	}
+	\g_semantex_data_bool_get:nnTF { #1 } { par }
+	{
+		\g_semantex_data_tl_get_store:nnN { #1 } { par_size }
+		\l__semantex_rightreturn_par_size_temp
+		\g_semantex_data_tl_get_store:nnN { #1 } { par_open } \l__semantex_rightreturn_par_open_temp
+		\g_semantex_data_tl_get_store:nnN { #1 } { par_close } \l__semantex_rightreturn_par_close_temp
+		\g_semantex_data_tl_get_store:nnN { #1 } { arg } \l__semantex_rightreturn_arg_temp
+		\g_semantex_data_tl_get_store:nnN { #1 } { prearg } \l_semantex_rightreturn_prearg_temp
+		\g_semantex_data_tl_get_store:nnN { #1 } { postarg } \l_semantex_rightreturn_postarg_temp
+		\tl_set:Nx\l__semantex_rightreturn_par_temp
+		{
+			{ \exp_not:V \l__semantex_rightreturn_par_size_temp }
+			{ \exp_not:V \l__semantex_rightreturn_par_open_temp }
+			{ \exp_not:V \l__semantex_rightreturn_par_close_temp }
+			{ \exp_not:V \l_semantex_rightreturn_prearg_temp }
+			{ \exp_not:V \l__semantex_rightreturn_arg_temp }
+			{ \exp_not:V \l_semantex_rightreturn_postarg_temp }
+		}
+		\tl_put_left:Nn\l__semantex_rightreturn_par_temp
+		{
+			\exp_not:N
+			\g_semantex_parentheses:nnnnnn
+		}
+		\g_semantex_data_tl_put_right:nnx { #1 } { symbol }
+		{
+			\exp_not:V\l__semantex_rightreturn_par_temp
+		}
+	}
+	{
+		\tl_set:Nx\l__semantex_rightreturn_nopar_temp
+		{
+			{ \g_semantex_data_tl_get_exp_not:nn { #1 } { prearg } }
+			{ \g_semantex_data_tl_get_exp_not:nn { #1 } { arg } }
+			{ \g_semantex_data_tl_get_exp_not:nn { #1 } { postarg } }
+		}
+		\tl_put_left:Nn\l__semantex_rightreturn_nopar_temp
+		{
+			\exp_not:N
+			\g_semantex_no_parentheses:nnn
+		}
+		\g_semantex_data_tl_put_right:nnx { #1 } { symbol }
+		{
+			\exp_not:V\l__semantex_rightreturn_nopar_temp
+		}
+	}
+	\g_semantex_data_tl_clear:nn { #1 } { upper_index }
+	\g_semantex_data_bool_provide:nn { #1 } { first_upper }
+	\g_semantex_data_bool_set_true:nn { #1 } { first_upper }
+	\g_semantex_data_tl_clear:nn { #1 } { lower_index }
+	\g_semantex_data_bool_provide:nn { #1 } { first_lower }
+	\g_semantex_data_bool_set_true:nn { #1 } { first_lower }
+	\g_semantex_data_tl_clear:nn { #1 } { arg }
+	\g_semantex_data_bool_provide:nn { #1 } { first_arg }
+	\g_semantex_data_bool_set_true:nn { #1 } { first_arg }
+	\g_semantex_data_tl_clear:nn { #1 } { preupper }
+	\g_semantex_data_tl_clear:nn { #1 } { postupper }
+	\g_semantex_data_tl_clear:nn { #1 } { prelower }
+	\g_semantex_data_tl_clear:nn { #1 } { postlower }
+	%IM maybe one should enclose the new symbol in another group
+	%IM Maybe should also reset stuff like par size
+	%IM reset leftpar, rightpar, parsize etc. also
+}
+
+
+\cs_new:Npn\g_semantex_primitive_valuekey_leftreturn:nn#1#2
+{
+	\g_semantex_data_tl_inherit_x:nn { #1 } { upper_left_index }
+	\g_semantex_data_tl_inherit_x:nn { #1 } { lower_left_index }
+	\g_semantex_data_tl_inherit_x:nn { #1 } { preupperleft }
+	\g_semantex_data_tl_inherit_x:nn { #1 } { postupperleft }
+	\g_semantex_data_tl_inherit_x:nn { #1 } { prelowerleft }
+	\g_semantex_data_tl_inherit_x:nn { #1 } { postlowerleft }
+	%IMPLEMENT THIS!!!
+	% Clean up the following names
+	\g_semantex_data_tl_get_store:nnN { #1 } { upper_left_index } \l__semantex_leftreturn_upper_left_index_temp
+	\g_semantex_data_tl_get_store:nnN { #1 } { lower_left_index } \l__semantex_leftreturn_lower_left_index_temp
+	\g_semantex_data_tl_get_store:nnN { #1 } { symbol } \l__semantex_leftreturn_symbol_temp
+	\g_semantex_data_tl_get_store:nnN { #1 } { preupperleft } \l__semantex_leftreturn_preupperleft_temp
+	\g_semantex_data_tl_get_store:nnN { #1 } { postupperleft } \l__semantex_leftreturn_postupperleft_temp
+	\g_semantex_data_tl_get_store:nnN { #1 } { prelowerleft } \l__semantex_leftreturn_prelowerleft_temp
+	\g_semantex_data_tl_get_store:nnN { #1 } { postlowerleft } \l__semantex_leftreturn_postlowerleft_temp
+	\g_semantex_data_tl_set:nnx { #1 } { symbol }
+	{
+		% Setup indices:
+		\exp_not:N\g_semantex_left_indices:nnnnnn
+		{
+			\exp_not:V \l__semantex_leftreturn_preupperleft_temp
+		}
+		{
+			\exp_not:V \l__semantex_leftreturn_upper_left_index_temp
+		}
+		{
+			\exp_not:V \l__semantex_leftreturn_postupperleft_temp
+		}
+		{
+			\exp_not:V \l__semantex_leftreturn_prelowerleft_temp
+		}
+		{
+			\exp_not:V \l__semantex_leftreturn_lower_left_index_temp
+		}
+		{
+			\exp_not:V \l__semantex_leftreturn_postlowerleft_temp
+		}
+		\exp_not:V \l__semantex_leftreturn_symbol_temp
+	}
+	\g_semantex_data_tl_clear:nn { #1 } { upper_left_index }
+	\g_semantex_data_bool_provide:nn { #1 } { first_upper_left }
+	\g_semantex_data_bool_set_true:nn { #1 } { first_upper_left }
+	\g_semantex_data_tl_clear:nn { #1 } { lower_left_index }
+	\g_semantex_data_bool_provide:nn { #1 } { first_lower_left }
+	\g_semantex_data_bool_set_true:nn { #1 } { first_lower_left }
+	\g_semantex_data_tl_clear:nn { #1 } { preupperleft }
+	\g_semantex_data_tl_clear:nn { #1 } { postupperleft }
+	\g_semantex_data_tl_clear:nn { #1 } { prelowerleft }
+	\g_semantex_data_tl_clear:nn { #1 } { postlowerleft }
+}
+
+
+\cs_new:Npn\g_semantex_primitive_valuekey_parent:nn#1#2{
+	% Must inherit everything from the parent class
+	%\tl_clear_new:c { semantex_data_tl_#1_parent }
+	%\g_semantex_data_tl_provide:nn { #1 } { parent }
+	%IM This should always be declared, so no need for if_provided checks
+	%IM This does not work, for unknown reasons:
+%	\seq_if_in:NxTF \semantex_all_objects_seq { #2 }
+%	{	\tl_set:cn { semantex_data_tl_#1_parent } { #2 }	}
+%	{ \msg_error:nnnn { semantex } { parent_not_found } { #2 } { #1 } }
+	%IM control if exists!
+	%\tl_set:cn { semantex_data_tl_#1_parent } { #2 }
+	\g_semantex_data_tl_set:nnn { #1 } { parent } { #2 }
+}
+
+\cs_set_eq:NN\g_semantex_primitive_valuekey_class:nn\g_semantex_primitive_valuekey_parent:nn
+
+
+
+\cs_new:Npn\g_semantex_primitive_valuekey_copy:nn#1#2{
+	% Must inherit everything from the parent class
+	\g_semantex_primitive_valuekey_parent:nn{#1}{ \cs_to_str:N #2 }
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_valuekeys:nn#1#2{
+	% Add new valuekeys via the interface
+	% valuekeys={
+	%	{key1}{do something with \l_semantex_key_value_temp},
+	%	{key2}{g=\l_semantex_key_value_temp,i=\l_semantex_key_value_temp},
+	% }
+	\g_semantex_data_prop_provide:nn { #1 } { custom_valuekeys }
+	\clist_map_inline:nn { #2 }{
+		\g_semantex_valuekey_equality_format:nnn{#1}##1
+	}
+}
+
+\cs_generate_variant:Nn\g_semantex_data_prop_put:nnnn {nnno}
+
+\cs_new:Npn \g_semantex_valuekey_equality_format:nnn#1#2#3
+{
+	\cs_set:Npn\l__semantex_valuekey_equality_format_temp:n##1{#3}
+	\g_semantex_data_prop_put:nnno {#1} {custom_valuekeys} {#2} {\l__semantex_valuekey_equality_format_temp:n{\l_semantex_key_value_temp}}
+	%IM Remove spaces in #2
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_novaluekeys:nn#1#2{
+	% Add sinple keys, taking no values, via the
+	% interface
+	% novaluekeys={
+	%	{key1}{print something},
+	%	{key2}{d=42,i=42},
+	% }
+	\g_semantex_data_prop_provide:nn { #1 } { custom_novaluekeys }
+	\clist_map_inline:nn { #2 }{
+		\g_semantex_valuekey_noequality_format:nnn{#1}##1
+	}
+}
+
+\cs_new:Npn \g_semantex_valuekey_noequality_format:nnn#1#2#3{
+	%\prop_put:cnn { semantex_data_prop_#1_custom_novaluekeys }{#2}{#3}
+	\g_semantex_data_prop_put:nnnn {#1} {custom_novaluekeys} {#2} {#3}
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_argvaluekeys:nn#1#2{
+	% Add new valuekeys via the interface
+	% valuekeys={
+	%	{key1}{do something with \l_semantex_key_value_temp},
+	%	{key2}{g=\l_semantex_key_value_temp,i=\l_semantex_key_value_temp},
+	% }
+	\g_semantex_data_prop_provide:nn { #1 } { custom_arg_valuekeys }
+	\clist_map_inline:nn { #2 }{
+		\g_semantex_arg_valuekey_equality_format:nnn{#1}##1
+	}
+}
+
+\cs_new:Npn \g_semantex_arg_valuekey_equality_format:nnn#1#2#3{
+	%\prop_put:cnn { semantex_data_prop_#1_custom_arg_valuekeys }{#2}{#3}
+	\cs_set:Npn\l__semantex_arg_valuekey_equality_format_temp:n##1{#3}
+	\g_semantex_data_prop_put:nnno {#1} {custom_arg_valuekeys} {#2} {\l__semantex_arg_valuekey_equality_format_temp:n{\l_semantex_arg_key_value_temp}}
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_argnovaluekeys:nn#1#2{
+	% Add sinple keys, taking no values, via the
+	% interface
+	% novaluekeys={
+	%	{key1}{print something},
+	%	{key2}{g=42,i=42},
+	% }
+	\g_semantex_data_prop_provide:nn { #1 } { custom_arg_novaluekeys }
+	\clist_map_inline:nn { #2 }{
+		\g_semantex_arg_valuekey_noequality_format:nnn{#1}##1
+	}
+}
+
+\cs_new:Npn \g_semantex_arg_valuekey_noequality_format:nnn#1#2#3{
+	\g_semantex_data_prop_put:nnnn {#1} {custom_arg_novaluekeys} {#2} {#3}
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_symbol:nn#1#2{
+	% Sets the value of the symbol
+	\g_semantex_data_tl_set:nnn { #1 } { symbol } { \exp_not:n { #2 } }
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_texclass:nn#1#2{
+	% Sets the value of the symbol
+	\g_semantex_data_tl_set:nnn { #1 } { texclass } { \exp_not:n { #2 } }
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_slot:nn#1#2{
+	% Sets the value of the symbol
+	\g_semantex_data_tl_set:nnn { #1 } { slot } { \exp_not:n { #2 } }
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_symbolputright:nn#1#2{
+	\g_semantex_data_tl_put_right:nnn { #1 } { symbol } { \exp_not:n { #2 } }
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_symbolputleft:nn#1#2{
+	\g_semantex_data_tl_put_left:nnn { #1 } { symbol } { \exp_not:n { #2 } }
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_command:nn#1#2{
+	% Adds one entry on the left of the command
+	% sequence to be applied to the symbol
+	\g_semantex_data_seq_put_right:nnn { #1 } { commands_sequence } { #2 } %IM maybe \exp_not:n { #2 }?
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_argwithkeyval:nn#1#2{
+	% Sets the argument (printed in parentheses
+	% after the symbol)
+	\g_semantex_arg_keys_set:nn { #1 } {{{ #2 }}}
+	%IM for unknown reasons, one needs these extra braces.
+	%IM This should be moved to the arg valuekeys themselves
+	%IM where ifoutput=true is also declared
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_argwithnovaluekeys:nn#1#2{
+	% Sets the argument (printed in parentheses
+	% after the symbol)
+	\g_semantex_arg_novaluekeys_set:nn { #1 } { #2 }
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_argwithonenovaluekey:nn#1#2{
+	% Sets the argument (printed in parentheses
+	% after the symbol)
+	\use:c { g_semantex_data_cs_#1_arg_novaluekey:n } {{{{ #2 }}}}
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_argwithoutkeyval:nn#1#2{
+	\g_semantex_data_tl_put_right:nnn { #1 } { arg } { \exp_not:n { #2 } }
+	\g_semantex_primitive_valuekey_ifrightreturnbeforerender:nn{#1}{true}
+}
+
+
+%\cs_new:Npn\g_semantex_primitive_valuekey_useargwithkeyval:nn#1#2
+%{
+%%	\g_semantex_primitive_valuekey_valuekeys:nn { #1 }
+%%	{
+%%		{arg} { argwithkeyval={ \l_semantex_key_value_temp } },
+%%	}
+%	\g_semantex_keys_set:nn { #1 }{
+%		\exp_not:n{valuekeys={
+%			{arg}{ argwithkeyval={\l_semantex_key_value_temp} },
+%		},}
+%	}
+%}
+
+
+\cs_new:Npn\g_semantex_primitive_valuekey_argsep:nn#1#2
+{
+	%\g_semantex_data_tl_provide:nn { #1 } { argsep }
+	\g_semantex_data_tl_set:nnn { #1 } { argsep } { \exp_not:n { #2 } }
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_argdots:nn#1#2
+{
+%	\g_semantex_data_tl_provide:nn { #1 } { argdots }
+	\g_semantex_data_tl_set:nnn { #1 } { argdots } { \exp_not:n { #2 } }
+}
+
+
+\cs_new:Npn\g_semantex_primitive_valuekey_prearg:nn#1#2{
+	\tl_if_blank:nF{#2}
+	{
+		\g_semantex_data_tl_put_left:nnn { #1 } { prearg } { \exp_not:n { #2 } }
+	}
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_postarg:nn#1#2{
+	\tl_if_blank:nF{#2}
+	{
+		\g_semantex_data_tl_put_right:nnn { #1 } { postarg } {  \exp_not:n{ #2 } }
+	}
+}
+
+
+\cs_new:Npn\g_semantex_primitive_valuekey_output:nn#1#2
+{
+	\g_semantex_data_tl_set:nnn { #1 } { output } { #2 }
+	% Maybe allow output=self
+}
+
+
+\cs_new:Npn\g_semantex_primitive_valuekey_outputoptions:nn#1#2{
+	\g_semantex_data_tl_put_right:nnn { #1 } { output_options } { #2, }
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_ifrightreturnbeforerender:nn#1#2{
+	% tells whether to use the output class or not
+	\str_if_eq:nnTF { #2 } { true }
+	{
+		\g_semantex_data_bool_set_true:nn { #1 } { rightreturnbeforerender }
+	}
+	{
+		\str_if_eq:nnTF { #2 } { false }
+		{
+			\g_semantex_data_bool_set_false:nn { #1 } { rightreturnbeforerender }
+		}
+		{
+			%IM do nothing right now, but should
+			%IM probably throw an error
+		}
+	}
+}
+				
+\cs_new:Npn\g_semantex_primitive_valuekey_ifoutput:nn#1#2{ %IMPLEMENT THIS
+	% tells whether to output or not
+	\str_if_eq:nnTF { #2 } { true }
+	{
+		\g_semantex_data_bool_set_true:nn { #1 } { output }
+	}
+	{
+		\str_if_eq:nnTF { #2 } { false }
+		{
+			\g_semantex_data_bool_set_false:nn { #1 } { output }
+		}
+		{
+			%IM do nothing right now, but should
+			%IM probably throw an error
+		}
+	}
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_gradingpos:nn#1#2{
+		% tells whether to use upper or lower indices
+		\g_semantex_data_bool_provide:nn { #1 } { upper_grading }
+		\str_case:nnTF { #2 }
+		{
+			{ upper }
+			{
+				\g_semantex_data_bool_set_true:nn { #1 } { upper_grading }
+			}
+			{ lower }
+			{
+				\g_semantex_data_bool_set_false:nn { #1 } { upper_grading }
+			}
+		}
+		{
+			% do nohting
+		}
+		{
+			% do nothing at the moment, but should probably throw an error
+		}
+}
+
+\cs_set_eq:NN \g_semantex_primitive_valuekey_gradingposition:nn \g_semantex_primitive_valuekey_gradingpos:nn
+
+% Upper and lower right indices:
+
+\cs_new:Npn\g_semantex_primitive_valuekey_upper:nn#1#2{
+	% adds to the upper index
+	\tl_if_blank:nF{#2}{
+		\g_semantex_data_tl_put_right:nnn { #1 } { upper_index } { \exp_not:n{ #2 } }
+		% For a long time, when using x type expansions when checking
+		% if indices were empty, two \exp_not:n's were necessary here.
+		% Thankfully, I can now happily remove them again, it seems.
+		%\g_semantex_data_bool_provide:nn { #1 } { first_upper }
+		\g_semantex_data_bool_set_false:nn { #1 } { first_upper }
+	}
+}
+
+
+
+\cs_new:Npn\g_semantex_primitive_valuekey_supper:nn#1#2{
+	% adds to the upper index, with a separator
+	\tl_if_blank:nF{#2}
+	{
+		\g_semantex_data_bool_get:nnTF { #1 } { first_upper }
+		{
+			\g_semantex_data_tl_put_right:nnn { #1 } { upper_index } { \exp_not:n { #2 } }
+		}
+		{
+			\g_semantex_data_tl_put_right:nnx { #1 } { upper_index }
+			{ \exp_not:n { \g_semantex_data_tl_get:nn { #1 } { uppersep } } }
+			\g_semantex_data_tl_put_right:nnn { #1 } { upper_index } { \exp_not:n { #2 } }
+		}
+		\g_semantex_data_bool_set_false:nn { #1 } { first_upper }
+	}
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_upperaddleft:nn#1#2{
+	% adds to the upper index
+	\tl_if_blank:nF{#2}{
+		\g_semantex_data_tl_put_left:nnn { #1 } { upper_index } { \exp_not:n{ #2 } }
+		\g_semantex_data_bool_set_false:nn { #1 } { first_upper }
+	}
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_preupper:nn#1#2{
+	\tl_if_blank:nF{#2}
+	{
+		\g_semantex_data_tl_put_left:cn { #1 } { preupper } { \exp_not:n{ #2 } }
+	}
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_postupper:nn#1#2{
+	\tl_if_blank:nF{#2}
+	{
+		\g_semantex_data_tl_put_right:nnn { #1 } { postupper } {  \exp_not:n{ #2 } }
+	}
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_lower:nn#1#2{
+	% adds to the lower index
+	\tl_if_blank:nF{#2}
+	{
+		\g_semantex_data_tl_put_right:nnn { #1 } { lower_index } { \exp_not:n { #2 } }
+		\g_semantex_data_bool_set_false:nn { #1 } { first_lower }
+	}
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_slower:nn#1#2{
+	% adds to the lower index, with a separator
+	\tl_if_blank:nF{#2}
+	{
+		\g_semantex_data_bool_get:nnTF { #1 } { first_lower }
+		{
+			\g_semantex_data_tl_put_right:nnn { #1 } { lower_index } { \exp_not:n { #2 } }
+		}
+		{
+			\g_semantex_data_tl_put_right:nnx { #1 } { lower_index }
+			{ \exp_not:n { \g_semantex_data_tl_get:nn { #1 } { lowersep } } }
+			\g_semantex_data_tl_put_right:nnn { #1 } { lower_index } { \exp_not:n { #2 } }
+		}
+		\g_semantex_data_bool_set_false:nn { #1 } { first_lower }
+	}
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_loweraddleft:nn#1#2{
+	% adds to the lower index
+	\tl_if_blank:nF{#2}
+	{
+		\g_semantex_data_tl_put_left:nnn { #1 } { lower_index } { \exp_not:n { #2 } }
+		\g_semantex_data_bool_set_false:nn { #1 } { first_lower }
+	}
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_prelower:nn#1#2{
+	% adds to the lower index
+	\tl_if_blank:nF{#2}
+	{
+		\g_semantex_data_tl_put_left:nnn { #1 } { prelower } { \exp_not:n { #2 } }
+	}
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_postlower:nn#1#2{
+	% adds to the lower index
+	\tl_if_blank:nF{#2}
+	{
+		\g_semantex_data_tl_put_right:nnn { #1 } { postlower } { \exp_not:n{ #2 } }
+	}
+}
+
+\cs_generate_variant:Nn \tl_if_blank:nTF { vTF }
+
+\cs_new:Npn \g_semantex_primitive_upper_lower_auxiliary_first_arg:nn#1#2 { #1 }
+
+\cs_new:Npn \g_semantex_primitive_upper_lower_auxiliary_second_arg:nn#1#2 { #2 }
+
+\cs_new:Npn\g_semantex_primitive_valuekey_uppersep:nn#1#2{
+	% uppersep={separator}{contents} adds contents to the upper index
+	% with the appropriate index separator
+	\g_semantex_data_bool_inherit:nn { #1 } { first_upper }
+	\g_semantex_data_bool_get:nnTF { #1 } { first_upper }
+	{
+		\g_semantex_data_tl_put_right:nnn { #1 } { upper_index } {
+			\exp_not:n {
+				\g_semantex_primitive_upper_lower_auxiliary_second_arg:nn #2
+			}
+		}
+	}
+	{
+		\g_semantex_data_tl_put_right:nnn { #1 } { upper_index } {
+			\exp_not:n {
+				\g_semantex_primitive_upper_lower_auxiliary_first_arg:nn #2
+				\g_semantex_primitive_upper_lower_auxiliary_second_arg:nn #2
+			}
+		}
+	}
+	\g_semantex_data_bool_set_false:nn { #1 } { first_upper }
+}
+
+
+\cs_new:Npn\g_semantex_primitive_valuekey_lowersep:nn#1#2{
+	% lowersep={separator}{contents} adds contents to the lower index
+	% with the appropriate index separator
+	\g_semantex_data_bool_get:nnTF { #1 } { first_lower }
+	{
+		\g_semantex_data_tl_put_right:nnn { #1 } { lower_index } {
+			\exp_not:n {
+				\g_semantex_primitive_upper_lower_auxiliary_second_arg:nn #2
+			}
+		}
+	}
+	{
+		\g_semantex_data_tl_put_right:nnn { #1 } { lower_index } {
+				\exp_not:n { \g_semantex_primitive_upper_lower_auxiliary_first_arg:nn #2 \g_semantex_primitive_upper_lower_auxiliary_second_arg:nn #2
+			}
+		}
+	}
+	\g_semantex_data_bool_set_false:nn { #1 } { first_lower }
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_cupper:nn#1#2{
+	% adds to the upper index, with a comma as separator
+	\tl_if_blank:nF{#2}
+	{
+		\g_semantex_data_bool_get:nnTF { #1 } { first_upper }
+		{
+			\g_semantex_data_tl_put_right:nnn { #1 } { upper_index } { \exp_not:n { #2 } }
+		}
+		{
+			\g_semantex_data_tl_put_right:nnn { #1 } { upper_index } { , \exp_not:n { #2 } }
+		}
+		\g_semantex_data_bool_set_false:nn { #1 } { first_upper }
+	}
+}
+
+
+\cs_new:Npn\g_semantex_primitive_valuekey_clower:nn#1#2{
+	% adds to the lower index, with a comma as separator
+	\tl_if_blank:nF{#2}
+	{
+		\g_semantex_data_bool_get:nnTF { #1 } { first_lower }
+		{
+			\g_semantex_data_tl_put_right:nnn { #1 } { lower_index } { \exp_not:n { #2 } }
+		}
+		{
+			\g_semantex_data_tl_put_right:nnn { #1 } { lower_index } { , \exp_not:n { #2 } }
+		}
+		\g_semantex_data_bool_set_false:nn { #1 } { first_lower }
+	}
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_iffirstupper:nn#1#2
+{
+	\tl_if_eq:nnTF { #2 } { true }
+	{
+		\g_semantex_data_bool_set_true:nn { #1 } { first_upper }
+	}
+	{
+		\tl_if_eq:nnTF { #2 } { false }
+		{
+			\g_semantex_data_bool_set_false:nn { #1 } { first_upper }
+		}
+		{
+			%IM Throw error later
+		}
+	}
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_iffirstlower:nn#1#2
+{
+	\tl_if_eq:nnTF { #2 } { true }
+	{
+		\g_semantex_data_bool_set_true:nn { #1 } { first_lower }
+	}
+	{
+		\tl_if_eq:nnTF { #2 } { false }
+		{
+			\g_semantex_data_bool_set_false:nn { #1 } { first_lower }
+		}
+		{
+			%IM Throw error later
+		}
+	}
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_setuppersep:nn#1#2
+{
+	\g_semantex_data_tl_set:nnn { #1 } { uppersep } { \exp_not:n { #2 }}
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_setlowersep:nn#1#2
+{
+	\g_semantex_data_tl_set:nnn { #1 } { lowersep } { \exp_not:n { #2 }}
+}
+
+%--------------- Left indices:
+
+\cs_new:Npn\g_semantex_primitive_valuekey_upperleft:nn#1#2{
+	% adds to the upper left index
+	\tl_if_blank:nF{#2}{
+		\g_semantex_data_tl_put_left:nnn { #1 } { upper_left_index } { \exp_not:n{ #2 } }
+		\g_semantex_data_bool_set_false:nn { #1 } { first_upper_left }
+	}
+}
+
+
+
+\cs_new:Npn\g_semantex_primitive_valuekey_supperleft:nn#1#2{
+	\tl_if_blank:nF{#2}
+	{
+		\g_semantex_data_bool_get:nnTF { #1 } { first_upper_left }
+		{
+			\g_semantex_data_tl_put_left:nnn { #1 } { upper_left_index } { \exp_not:n { #2 } }
+		}
+		{
+			\g_semantex_data_tl_put_left:nnn { #1 } { upper_left_index } { \exp_not:n { #2 } }
+			\g_semantex_data_tl_put_left:nnx { #1 } { upper_left_index }
+			{ \exp_not:n { \g_semantex_data_tl_get:nn { #1 } { uppersep } } }
+		}
+		\g_semantex_data_bool_set_false:nn { #1 } { first_upper_left }
+	}
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_upperleftaddright:nn#1#2{
+	% adds to the upper index
+	\tl_if_blank:nF{#2}{
+		\g_semantex_data_tl_put_right:nnn { #1 } { upper_left_index } { \exp_not:n{ #2 } }
+		\g_semantex_data_bool_set_false:nn { #1 } { first_upper_left }
+	}
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_preupperleft:nn#1#2{
+	% adds to the lower index
+	\tl_if_blank:nF{#2}
+	{
+		\g_semantex_data_tl_put_left:nnn { #1 } { preupperleft } { \exp_not:n{ #2 } }
+	}
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_postupperleft:nn#1#2{
+	% adds to the lower index
+	\tl_if_blank:nF{#2}
+	{
+		\g_semantex_data_tl_put_right:nnn { #1 } { postupperleft } { \exp_not:n{ #2 } }
+	}
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_lowerleft:nn#1#2{
+	% adds to the lower left index
+	\tl_if_blank:nF{#2}
+	{
+		\g_semantex_data_tl_put_left:nnn { #1 } { lower_left_index } { \exp_not:n{ #2 } }
+		\g_semantex_data_bool_set_false:nn { #1 } { first_lower_left }
+	}
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_slowerleft:nn#1#2{
+	% adds to the lower index
+	\tl_if_blank:nF{#2}
+	{
+		\g_semantex_data_bool_get:nnTF { #1 } { first_lower_left }
+		{
+			\g_semantex_data_tl_put_left:nnn { #1 } { lower_left_index } { \exp_not:n { #2 } }
+		}
+		{
+			\g_semantex_data_tl_put_left:nnn { #1 } { lower_left_index } { \exp_not:n { #2 } }
+			\g_semantex_data_tl_put_left:nnx { #1 } { lower_left_index }
+			{ \exp_not:n { \g_semantex_data_tl_get:nn { #1 } { lowerleftsep } } }
+		}
+		\g_semantex_data_bool_set_false:nn { #1 } { first_lower_left }
+	}
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_lowerleftaddright:nn#1#2{
+	% adds to the lower index
+	\tl_if_blank:nF{#2} %This test really shouldn’t be made.
+	{
+		\g_semantex_data_tl_put_right:nnn { #1 } { lower_left_index } { \exp_not:n{ #2 } }
+		\g_semantex_data_bool_set_false:nn { #1 } { first_lower_left }
+	}
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_prelowerleft:nn#1#2{
+	% adds to the lower index
+	\tl_if_blank:nF{#2}
+	{
+		\g_semantex_data_tl_put_left:nnn { #1 } { prelowerleft } { \exp_not:n{ #2 } }
+	}
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_postlowerleft:nn#1#2{
+	% adds to the lower index
+	\tl_if_blank:nF{#2}
+	{
+		\g_semantex_data_tl_put_right:nnn { #1 } { postlowerleft } { \exp_not:n{ #2 } }
+	}
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_upperleftsep:nn#1#2{
+	% adds to the upper index
+	\g_semantex_data_bool_get:nnTF { #1 } { first_left_upper }
+	{
+		\g_semantex_data_tl_put_left:nnn { #1 } { upper_left_index } {
+			\exp_not:n { \g_semantex_primitive_upper_lower_auxiliary_second_arg:nn #2 }
+		}
+	}
+	{
+		\g_semantex_data_tl_put_left:nnn { #1 } { upper_left_index } {
+			\exp_not:n { \g_semantex_primitive_upper_lower_auxiliary_second_arg:nn #2 \g_semantex_primitive_upper_lower_auxiliary_first_arg:nn #2 }
+		}
+	}
+	\g_semantex_data_bool_set_false:nn { #1 } { first_left_upper }
+}
+
+
+\cs_new:Npn\g_semantex_primitive_valuekey_lowerleftsep:nn#1#2{
+	% adds to the lower index
+	\g_semantex_data_bool_get:nnTF { #1 } { first_lower_left }
+	{
+		\g_semantex_data_tl_put_left:nnn { #1 } { lower_left_index } {
+			\exp_not:n { \g_semantex_primitive_upper_lower_auxiliary_second_arg:nn #2 }
+		}
+	}
+	{
+		\g_semantex_data_tl_put_left:nnn { #1 } { lower_left_index } {
+			\exp_not:n { \g_semantex_primitive_upper_lower_auxiliary_second_arg:nn #2 \g_semantex_primitive_upper_lower_auxiliary_first_arg:nn #2 }
+		}
+	}
+	\g_semantex_data_bool_set_false:nn { #1 } { first_lower_left }
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_cupperleft:nn#1#2{
+	% adds to the upper index
+	\tl_if_blank:nF{#2}
+	{
+		\g_semantex_data_bool_get:nnTF { #1 } { first_upper_left }
+		{
+			\g_semantex_data_tl_put_left:nnn { #1 } { upper_left_index } { \exp_not:n { #2 } }
+		}
+		{
+			\g_semantex_data_tl_put_left:nnn { #1 } { upper_left_index } { \exp_not:n { #2 } , }
+		}
+		\g_semantex_data_bool_set_false:nn { #1 } { first_upper_left }
+	}
+}
+
+
+\cs_new:Npn\g_semantex_primitive_valuekey_clowerleft:nn#1#2{
+	% adds to the lower index
+	\tl_if_blank:nF{#2}
+	{
+		\g_semantex_data_bool_get:nnTF { #1 } { first_lower_left }
+		{
+			\g_semantex_data_tl_put_left:nnn { #1 } { lower_left_index } { \exp_not:n { #2 } }
+		}
+		{
+			\g_semantex_data_tl_put_left:nnn { #1 } { lower_left_index } { \exp_not:n { #2 } , }
+		}
+		\g_semantex_data_bool_set_false:nn { #1 } { first_lower_left }
+	}
+}
+
+
+\cs_new:Npn\g_semantex_primitive_valuekey_iffirstupperleft:nn#1#2
+{
+	\tl_if_eq:nnTF { #2 } { true }
+	{
+		\g_semantex_data_bool_set_true:nn { #1 } { first_upper_left }
+	}
+	{
+		\tl_if_eq:nnTF { #2 } { false }
+		{
+			\g_semantex_data_bool_set_false:nn { #1 } { first_upper_left }
+		}
+		{
+			%IM Throw error later
+		}
+	}
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_iffirstlowerleft:nn#1#2
+{
+	\tl_if_eq:nnTF { #2 } { true }
+	{
+		\g_semantex_data_bool_set_true:nn { #1 } { first_lower_left }
+	}
+	{
+		\tl_if_eq:nnTF { #2 } { false }
+		{
+			\g_semantex_data_bool_set_false:nn { #1 } { first_lower_left }
+		}
+		{
+			%IM Throw error later
+		}
+	}
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_setupperleftsep:nn#1#2
+{
+	\g_semantex_data_tl_set:nnn { #1 } { upperleftsep } { \exp_not:n { #2 } }
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_setlowerleftsep:nn#1#2
+{
+	\g_semantex_data_tl_set:nnn { #1 } { lowerleftsep } { \exp_not:n { #2 } }
+}
+
+%---------------
+
+% Contrary to what you might think, the following commands ARE
+% sometimes needed.
+
+\cs_new:Npn\g_semantex_primitive_valuekey_iffirstd:nn#1#2
+{
+	\g_semantex_data_bool_get:nnTF { #1 } { upper_grading }
+	{ \g_semantex_primitive_valuekey_iffirstupper:nn { #1 } { #2 } }
+	{ \g_semantex_primitive_valuekey_iffirstlower:nn { #1 } { #2 } }
+}
+
+\cs_set_eq:NN\g_semantex_primitive_valuekey_iffirstdeg:nn\g_semantex_primitive_valuekey_iffirstd:nn
+
+\cs_set_eq:NN\g_semantex_primitive_valuekey_iffirstdegree:nn\g_semantex_primitive_valuekey_iffirstd:nn
+
+\cs_new:Npn\g_semantex_primitive_valuekey_iffirsti:nn#1#2
+{
+	\g_semantex_data_bool_get:nnTF { #1 } { upper_grading }
+	{ \g_semantex_primitive_valuekey_iffirstlower:nn { #1 } { #2 } }
+	{ \g_semantex_primitive_valuekey_iffirstupper:nn { #1 } { #2 } }
+}
+
+\cs_set_eq:NN\g_semantex_primitive_valuekey_iffirstindex:nn\g_semantex_primitive_valuekey_iffirsti:nn
+
+\cs_new:Npn\g_semantex_primitive_valuekey_d:nn#1#2
+{
+	% adds to the d-index (upper by default)
+	% I added an \exp_not:n here and in similar commands to
+	% take care of \underbrace expansion issues. However,
+	% I am puzzled as to why it was necessary.
+	%\bool_if:cTF { semantex_data_bool_#1_if_upper_grading }
+	\g_semantex_data_bool_get:nnTF { #1 } { upper_grading }
+		{
+		\g_semantex_primitive_valuekey_upper:nn { #1 } { #2 }
+	}
+	{
+		\g_semantex_primitive_valuekey_lower:nn { #1 } { #2 }
+	}
+}
+
+\cs_set_eq:NN\g_semantex_primitive_valuekey_deg:nn\g_semantex_primitive_valuekey_d:nn
+
+\cs_set_eq:NN\g_semantex_primitive_valuekey_degree:nn\g_semantex_primitive_valuekey_d:nn
+
+\cs_new:Npn\g_semantex_primitive_valuekey_sd:nn#1#2
+{
+	% adds to the d-index (upper by default)
+	\g_semantex_data_bool_get:nnTF { #1 } { upper_grading }
+	{
+		\g_semantex_primitive_valuekey_supper:nn { #1 } { #2 }
+	}
+	{
+		\g_semantex_primitive_valuekey_slower:nn { #1 } { #2 }
+	}
+}
+
+\cs_set_eq:NN\g_semantex_primitive_valuekey_sdeg:nn\g_semantex_primitive_valuekey_sd:nn
+
+\cs_set_eq:NN\g_semantex_primitive_valuekey_sdegree:nn\g_semantex_primitive_valuekey_sd:nn
+
+\cs_new:Npn\g_semantex_primitive_valuekey_cd:nn#1#2{ %IM Maybe remove this.
+	% adds to the d-index (upper by default)
+	\g_semantex_data_bool_get:nnTF { #1 } { upper_grading }
+		{
+		\g_semantex_primitive_valuekey_cupper:nn { #1 } { #2 }
+	}
+	{
+		\g_semantex_primitive_valuekey_clower:nn { #1 } { #2 }
+	}
+}
+
+
+
+
+\cs_set_eq:NN\g_semantex_primitive_valuekey_cdeg:nn\g_semantex_primitive_valuekey_cd:nn
+
+\cs_set_eq:NN\g_semantex_primitive_valuekey_cdegree:nn\g_semantex_primitive_valuekey_cd:nn
+
+
+\cs_new:Npn\g_semantex_primitive_valuekey_i:nn#1#2{
+	% adds to the i-index (lower by default)
+	%\bool_if:cTF { semantex_data_bool_#1_if_upper_grading }
+	\g_semantex_data_bool_get:nnTF { #1 } { upper_grading }
+		{
+		\g_semantex_primitive_valuekey_lower:nn { #1 } { #2 }
+	}
+	{
+		\g_semantex_primitive_valuekey_upper:nn { #1 } { #2 }
+	}
+}
+
+\cs_set_eq:NN\g_semantex_primitive_valuekey_index:nn\g_semantex_primitive_valuekey_i:nn
+
+\cs_new:Npn\g_semantex_primitive_valuekey_si:nn#1#2{
+	% adds to the i-index (lower by default)
+	\g_semantex_data_bool_get:nnTF { #1 } { upper_grading }
+	{
+		\g_semantex_primitive_valuekey_slower:nn { #1 } { #2 }
+	}
+	{
+		\g_semantex_primitive_valuekey_supper:nn { #1 } { #2 }
+	}
+}
+
+\cs_set_eq:NN\g_semantex_primitive_valuekey_sindex:nn\g_semantex_primitive_valuekey_si:nn
+
+\cs_new:Npn\g_semantex_primitive_valuekey_ci:nn#1#2{
+	% adds to the i-index (lower by default)
+	%\bool_if:cTF { semantex_data_bool_#1_if_upper_grading }
+	\g_semantex_data_bool_get:nnTF { #1 } { upper_grading }
+	{
+		\g_semantex_primitive_valuekey_clower:nn { #1 } { #2 }
+	}
+	{
+		\g_semantex_primitive_valuekey_cupper:nn { #1 } { #2 }
+	}
+}
+
+\cs_set_eq:NN\g_semantex_primitive_valuekey_cindex:nn\g_semantex_primitive_valuekey_ci:nn
+
+
+\cs_new:Npn\g_semantex_primitive_valuekey_par:nn#1#2{
+	% sets the size of the parentheses
+	\g_semantex_data_tl_set:nnn { #1 } { par_size }{ \exp_not:n { #2 } }
+	\g_semantex_primitive_valuekey_ifpar:nn { #1 } { true }
+}
+
+
+\cs_new:Npn\g_semantex_primitive_valuekey_parsize:nn#1#2{
+	% sets the size of the parentheses
+	\g_semantex_data_tl_set:nnn { #1 } { par_size }{ \exp_not:n { #2 } }
+}
+
+
+
+
+\cs_new:Npn\g_semantex_primitive_valuekey_leftpar:nn#1#2{
+%	\g_semantex_data_tl_set:nnn { #1 } { par_open }{ \exp_not:n { #2 } }
+	\tl_set:cn { semantex_data_tl_#1_par_open }{ \exp_not:n { #2 } }
+}
+
+
+
+
+
+\cs_new:Npn\g_semantex_primitive_valuekey_rightpar:nn#1#2{
+	\g_semantex_data_tl_set:nnn { #1 } { par_close }{ \exp_not:n { #2 } }
+}
+
+
+\cs_new:Npn\g_semantex_primitive_valuekey_ifpar:nn#1#2{ %IMPLEMENT THIS
+	% tells whether to use the output class or not
+	\g_semantex_data_bool_provide:nn { #1 } { par }
+	\str_if_eq:nnTF { #2 } { true }
+	{
+		\g_semantex_data_bool_set_true:nn { #1 } { par }
+	}
+	{
+		\str_if_eq:nnTF { #2 } { false }
+		{
+			\g_semantex_data_bool_set_false:nn { #1 } { par }
+		}
+		{
+			%IM do nothing right now, but should
+			%IM probably throw an error
+		}
+	}
+}
+
+
+
+\cs_new:Npn\g_semantex_primitive_valuekey_spar:nn#1#2
+{
+	\tl_if_blank:nTF { #2 }
+	{
+		\g_semantex_primitive_valuekey_return:nn { #1 }{}
+		\g_semantex_data_tl_set:nnx { #1 } { symbol }
+		{
+			{ \g_semantex_data_tl_get_exp_not:nn { #1 } { spar_size } }
+			%IM like in _return
+			{ \g_semantex_data_tl_get:nn { #1 } { spar_open } }
+			{ \g_semantex_data_tl_get:nn { #1 } { spar_close } }
+			{ \g_semantex_data_tl_get_exp_not:nn { #1 } { symbol } }
+%			{ \l__semantex_spar_symbol_temp }
+		}
+		\g_semantex_data_tl_put_left:nnn { #1 } { symbol }
+		{
+			\exp_not:N
+			\g_semantex_symbol_parentheses:nnnn
+		}
+	}
+	{
+		\g_semantex_data_tl_inherit:nn { #1 } { symbol }
+		\g_semantex_primitive_valuekey_return:nn { #1 }{}
+		\g_semantex_data_tl_set:nnx { #1 } { symbol }
+		{
+			{ \exp_not:n { \exp_not:n { #2 } } }
+			{ \g_semantex_data_tl_get:nn { #1 } { spar_open } }
+			{ \g_semantex_data_tl_get:nn { #1 } { spar_close } }
+			{ \g_semantex_data_tl_get_exp_not:nn { #1 } { symbol } }
+		}
+		\g_semantex_data_tl_put_left:nnn { #1 } { symbol }
+		{
+			\exp_not:N
+			\g_semantex_symbol_parentheses:nnnn
+		}
+	}
+}
+
+
+\cs_new:Npn\g_semantex_primitive_valuekey_iffirstarg:nn#1#2
+{
+	\tl_if_eq:nnTF { #2 } { true }
+	{
+		\g_semantex_data_bool_set_true:nn { #1 } { first_arg }
+	}
+	{
+		\tl_if_eq:nnTF { #2 } { false }
+		{
+			\g_semantex_data_bool_set_false:nn { #1 } { first_arg }
+		}
+		{
+			%IM Throw error later
+		}
+	}
+}
+
+\cs_new:Npn\g_semantex_auxiliary_first_arg:nn#1#2 { #1 }
+\cs_new:Npn\g_semantex_auxiliary_second_arg:nn#1#2 { #2 }
+
+%\cs_new:Npn\g_semantex_primitive_valuekey_otherspar:nn#1#2
+%{
+%	\g_semantex_data_tl_inherit:nn { #1 } { spar_size }
+%	\g_semantex_data_tl_inherit:nn { #1 } { symbol }
+%	\g_semantex_primitive_novaluekey_return:n { #1 }
+%%	\tl_set:Nn\l__semantex_spar_temp
+%%	{
+%%		\exp_not:N
+%%		\g_semantex_symbol_parentheses:nnnn
+%%	}
+%%	\tl_put_right:Nx\l__semantex_spar_temp
+%%	{
+%%		{ \exp_not:v { semantex_data_tl_#1_spar_size } }
+%%		{ \g_semantex_auxiliary_first_arg:nn#2 }
+%%		{ \g_semantex_auxiliary_second_arg:nn#2 }
+%%		{ \exp_not:v { semantex_data_tl_#1_symbol } }
+%%	}
+%%	\tl_set:cx { semantex_data_tl_#1_symbol } { \exp_not:V\l__semantex_spar_temp }
+%	\tl_set:cx { semantex_data_tl_#1_symbol }
+%	{
+%		%{ \exp_not:c { semantex_data_tl_#1_spar_size } }
+%		{ \exp_not:n { \use:c { semantex_data_tl_#1_spar_size } } }
+%		{ \g_semantex_auxiliary_first_arg:nn #2 }
+%		{ \g_semantex_auxiliary_second_arg:nn #2 }
+%		{ \exp_not:v { semantex_data_tl_#1_symbol } }
+%	}
+%	\tl_put_left:cn { semantex_data_tl_#1_symbol }
+%	{
+%		\exp_not:N
+%		\g_semantex_symbol_parentheses:nnnn
+%	}
+%}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_otherspar:nn#1#2
+{
+	\g_semantex_primitive_valuekey_otherspar_auxiliary:nnn { #1 } #2
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_otherspar_auxiliary:nnn#1#2#3
+{
+	%IM DOES NOT WORK!!!!!
+	\g_semantex_data_tl_inherit:nn { #1 } { spar_size }
+	\g_semantex_data_tl_get_store:nnN { #1 } { spar_size } \l__semantex_otherspar_spar_size_temp
+	\g_semantex_data_tl_inherit:nn { #1 } { symbol }
+	\g_semantex_primitive_valuekey_return:nn { #1 }{}
+%	\tl_set:Nn\l__semantex_spar_temp
+%	{
+%		\exp_not:N
+%		\g_semantex_symbol_parentheses:nnnn
+%	}
+%	\tl_put_right:Nx\l__semantex_spar_temp
+%	{
+%		{ \exp_not:v { semantex_data_tl_#1_spar_size } }
+%		{ \g_semantex_auxiliary_first_arg:nn#2 }
+%		{ \g_semantex_auxiliary_second_arg:nn#2 }
+%		{ \exp_not:v { semantex_data_tl_#1_symbol } }
+%	}
+%	\tl_set:cx { semantex_data_tl_#1_symbol } { \exp_not:V\l__semantex_spar_temp }
+	\g_semantex_data_tl_set:nnx { #1 } {  symbol }
+	{
+		%{ \exp_not:c { semantex_data_tl_#1_spar_size } }
+		%{ \exp_not:n { \use:c { semantex_data_tl_#1_spar_size } } }
+		%{ normal }
+		%{ \exp_not:n { \exp_not:v { semantex_data_tl_#1_spar_size } } }
+		{ \exp_not:V \l__semantex_otherspar_spar_size_temp }
+		{ \exp_not:n { \exp_not:n { #2 } } }
+		{ \exp_not:n { \exp_not:n { #3 } } }
+		{ \g_semantex_data_tl_get_exp_not:nn { #1 } { symbol } }
+	}
+	\g_semantex_data_tl_put_left:nnn { #1 } { symbol }
+	{
+		\exp_not:N
+		\g_semantex_symbol_parentheses:nnnn
+	}
+%	\tl_put_left:cx { g_auomath_#1_symbol }
+%	{
+%		\exp_not:N
+%		\g_semantex_symbol_parentheses:nnnn
+%	}
+	%\tl_put_left:cn { semantex_data_tl_#1_symbol }
+	%{
+	%	\exp_not:N
+	%	\g_semantex_symbol_parentheses:nnnn
+	%}
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_sparsize:nn#1#2{
+	% sets the size of the parentheses
+	\g_semantex_data_tl_set:nnn { #1 } { spar_size }{ \exp_not:n { #2 } }
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_leftspar:nn#1#2{
+	\g_semantex_data_tl_set:nnn { #1 } { spar_open }{ \exp_not:n { \exp_not:n { #2 } } }
+	%IM Two \exp_not necessary for unknown reasons
+	%IM Doing the same at leftpar yields an error.
+}
+
+\cs_new:Npn\g_semantex_primitive_valuekey_rightspar:nn#1#2{
+	\g_semantex_data_tl_set:nnn { #1 } { spar_close }{ \exp_not:n { \exp_not:n { #2 } } }
+	%IM Two \exp_not necessary for unknown reasons
+	%IM Doing the same at leftpar yields an error.
+}
+
+
+
+
+
+
+%\msg_new:nnnn { semantex } { singlekey_not_found } { Unknown~key~#1~passed~to~object~#2~on~input~line~\msg_line_number: } {}
+
+\cs_generate_variant:Nn \g_semantex_keys_set:nn { nx, no, nV }
+
+\cs_generate_variant:Nn \exp_args:Nnx { cnx }
+
+\cs_new:Npn \g_semantex_valuekey:nnn#1#2#3{
+	% Takes care of valuekeys, keys with a value
+	% For the sake of implementation, the arguments
+	% come in a strange order
+	% #1 = value of key
+	% #2 = name of the key
+	% #3 = object
+	%\tl_set:Nn\l_semantex_key_value_temp{#1}
+	\tl_set:Nn\l_semantex_key_value_temp{\exp_not:n{#1}}
+	%\tl_set:Nx\l_semantex_key_value_temp{\exp_not:n{\exp_not:n{#1}}} % stores the content of the key in the temporary command \l_semantex_key_value_temp
+	%\tl_set:Nn\l_semantex_key_value_temp{#1}
+	%\tl_set:No\l_semantex_key_value_temp{\exp_not:n{#1}} % stores the content of the key in the temporary command \l_semantex_key_value_temp
+	%IM think about using extra {...} to avoid interference with keyval str
+	\g_semantex_valuekey_get:nnNTF { #3 } { #2 } \l_semantex_custom_valuekey_temp
+	{
+		\g_semantex_keys_set:nx { #3 }
+		{ \l_semantex_custom_valuekey_temp }
+	}
+	{
+		\cs_if_exist:cTF { g_semantex_primitive_valuekey_#2:nn }
+		{
+			\use:c { g_semantex_primitive_valuekey_#2:nn }{ #3 }{ #1 }
+		}
+		{
+			\msg_error:nnnn { semantex } { keyval_not_found } { #2 } { #3 }
+		}
+	}
+}
+
+\cs_generate_variant:Nn \g_semantex_keys_set:nn { nx }
+
+\cs_new:Npn \g_semantex_novaluekey:nn#1#2
+{
+	% #1 = name of the key
+	% #2 = object
+%	% takes care of single keys, keys without a value
+	\g_semantex_novaluekey_get:nnNTF { #2 } { #1 } \l_semantex_custom_novaluekey_temp
+	{
+		\g_semantex_keys_set:nx { #2 }
+		{
+			\l_semantex_custom_novaluekey_temp
+		}
+	}
+	{
+		\g_semantex_keys_set:nn { #2 } { default = { #1 } }
+	}
+}
+
+%IMplement the same thing for upper, lower?? Probably not.
+
+\cs_new:Npn \g_semantex_arg_primitive_valuekey_sep_auxiliary_function_withsep:nn#1#2
+{
+	#1#2
+}
+
+\cs_new:Npn \g_semantex_arg_primitive_valuekey_sep_auxiliary_function_withoutsep:nn#1#2
+{
+	#2
+}
+
+\cs_new:Npn \g_semantex_primitive_arg_valuekey_sep:nn#1#2
+{
+	\g_semantex_data_bool_get:nnTF { #1 } { first_arg }
+	{
+		\g_semantex_data_tl_put_right:nnn { #1 } { arg } {
+			\exp_not:n { \g_semantex_arg_primitive_valuekey_sep_auxiliary_function_withoutsep:nn #2 }
+		}
+		%IM These do not use :x, unlike the ones below
+	}
+	{
+		\g_semantex_data_tl_put_right:nnn { #1 } { arg } { \exp_not:n { \g_semantex_arg_primitive_valuekey_sep_auxiliary_function_withsep:nn #2 } }
+	}
+	\g_semantex_primitive_valuekey_ifrightreturnbeforerender:nn{#1}{true}
+	\g_semantex_data_bool_set_false:nn { #1 } { first_arg }
+}
+
+\cs_new:Npn \g_semantex_primitive_arg_valuekey_standardsep:nn#1#2
+{
+	\g_semantex_data_bool_get:nnTF { #1 } { first_arg }
+	{
+		\g_semantex_data_tl_put_right:nnn { #1 } { arg } { \exp_not:n { #2 } }
+		%IM Recently corrected
+		% Previously, this was cx, but I didn’t see any point of this;
+		% this was mostly to create symmetry with the below case where
+		% cx is strictly necessary.
+	}
+	{
+		\g_semantex_data_tl_put_right:nnx { #1 } { arg } { \exp_not:n { \g_semantex_data_tl_get:nn { #1 } { argsep } } }
+		\g_semantex_data_tl_put_right:nnn { #1 } { arg } {\exp_not:n { #2 } }
+		% As an experiment, I tried changing cx to cn, and it failed
+		% when changing the separator on the fly.
+	}
+%	\g_semantex_primitive_valuekey_ifoutput:nn { #1 } { true }
+	\g_semantex_primitive_valuekey_ifrightreturnbeforerender:nn{#1}{true}
+	\g_semantex_data_bool_set_false:nn { #1 } { first_arg }
+}
+
+\cs_new:Npn \g_semantex_primitive_arg_valuekey_dots:nn#1#2
+{
+	\g_semantex_primitive_arg_valuekey_standardsep:nn { #1 } { \g_semantex_data_tl_get:nn { #1 } { argdots } }
+}
+
+\cs_new:Npn \g_semantex_primitive_arg_valuekey_slot:nn#1#2
+{
+	\g_semantex_primitive_arg_valuekey_standardsep:nn { #1 } { \g_semantex_data_tl_get:nn { #1 } { slot } }
+}
+
+\cs_generate_variant:Nn \g_semantex_arg_keys_set:nn { nx }
+
+\cs_new:Npn \g_semantex_arg_valuekey:nnn#1#2#3
+{
+	% Takes care of valuekeys, keys with a value
+	% For the sake of implementation, the arguments
+	% come in a strange order
+	% #1 = value of key
+	% #2 = name of the key
+	% #3 = object
+	\tl_set:Nn\l_semantex_arg_key_value_temp{\exp_not:n{#1}} % stores the content of the key in the temporary command \l_semantex_key_value_temp
+	\g_semantex_arg_valuekey_get:nnNTF { #3 } { #2 } \l_semantex_custom_arg_valuekey_temp
+	{
+		\g_semantex_arg_keys_set:nx { #3 } { \l_semantex_custom_arg_valuekey_temp }
+	}
+	{
+		\cs_if_exist:cTF { g_semantex_primitive_arg_valuekey_#2:nn }
+		{
+			\use:c { g_semantex_primitive_arg_valuekey_#2:nn }{ #3 }{ #1 }%
+		}
+		{
+			\msg_error:nnnn { semantex } { arg_valuekey_not_found } { #2 } { #3 }
+		}
+	}
+}
+
+
+\cs_new:Npn \g_semantex_arg_novaluekey:nn#1#2
+{
+	% #1 = name of the key
+	% #2 = object
+%	% takes care of single keys, keys without a value
+% the class key is not actually necessary
+	\g_semantex_arg_novaluekey_get:nnNTF { #2 } { #1 } \l_semantex_custom_arg_novaluekey_temp
+	{
+		%\exp_args:NNno
+		%\exp_args:Nno
+		%\use:c { g_semantex_data_cs_#3_arg:n }
+		\g_semantex_arg_keys_set:nx { #2 }
+		{
+			\l_semantex_custom_arg_novaluekey_temp
+		}
+	}
+	{
+		\g_semantex_data_tl_inherit_x:nn { #2 } { arg }
+		\g_semantex_arg_keys_set:nn { #2 } { default={\exp_not:n { #1 } }}
+		%\g_semantex_arg_keys_set:nn { #3 } { default={#1}}
+		%IM THis \exp_not:n was added late, might be needed elsewhere, too.
+	}
+}
+
+
+\g_semantex_data_tl_provide:nn { semantexvariable } { output }
+
+\g_semantex_data_tl_set:nnn { semantexvariable } { output } { semantexvariable }
+
+\g_semantex_data_tl_provide:nn { semantexvariable } { upper_index }
+
+\g_semantex_data_tl_provide:nn { semantexvariable } { uppersep }
+
+\g_semantex_data_tl_set:nnn { semantexvariable } { uppersep } { , }
+
+%IM Also, need commands like forgetupperindex, reverting to the class standard
+
+\g_semantex_data_tl_provide:nn { semantexvariable } { lower_index }
+
+\g_semantex_data_tl_provide:nn { semantexvariable } { lowersep }
+
+\g_semantex_data_tl_set:nnn { semantexvariable } { lowersep } { , }
+
+\g_semantex_data_tl_provide:nn { semantexvariable } { preupper }
+
+\g_semantex_data_tl_provide:nn { semantexvariable } { postupper }
+
+\g_semantex_data_tl_provide:nn { semantexvariable } { prelower }
+
+\g_semantex_data_tl_provide:nn { semantexvariable } { postlower }
+
+\g_semantex_data_tl_provide:nn { semantexvariable } { upper_left_index }
+
+\g_semantex_data_tl_provide:nn { semantexvariable } { upperleftsep }
+
+\g_semantex_data_tl_set:nnn { semantexvariable } { upperleftsep } { , }
+
+%IM do the same with all the others, INCLUDING if_upper_grading and symbol
+%IM Also, need commands like forgetupperindex, reverting to the class standard
+
+\g_semantex_data_tl_provide:nn { semantexvariable } { lower_left_index }
+
+\g_semantex_data_tl_provide:nn { semantexvariable } { lowerleftsep }
+
+\g_semantex_data_tl_set:nnn { semantexvariable } { lowerleftsep } { , }
+
+
+\g_semantex_data_tl_provide:nn { semantexvariable } { preupperleft }
+
+\g_semantex_data_tl_provide:nn { semantexvariable } { postupperleft }
+
+\g_semantex_data_tl_provide:nn { semantexvariable } { prelowerleft }
+
+\g_semantex_data_tl_provide:nn { semantexvariable } { postlowerleft }
+
+
+\g_semantex_data_bool_provide:nn { semantexvariable } { first_upper_left }
+\g_semantex_data_bool_set_true:nn { semantexvariable } { first_upper_left }
+
+\g_semantex_data_bool_provide:nn { semantexvariable } { first_lower_left }
+\g_semantex_data_bool_set_true:nn { semantexvariable } { first_lower_left }
+
+
+
+\g_semantex_data_tl_provide:nn { semantexvariable } { prearg }
+
+\g_semantex_data_tl_provide:nn { semantexvariable } { postarg }
+%IMplement these later
+
+\g_semantex_data_tl_provide:nn { semantexvariable } { arg }
+
+\g_semantex_data_tl_provide:nn { semantexvariable } { argsep }
+\g_semantex_data_tl_set:nnn { semantexvariable } { argsep } {,}
+
+\g_semantex_data_tl_provide:nn { semantexvariable } { slot }
+\g_semantex_data_tl_set:nnn { semantexvariable } { slot } { \semantexslot }
+
+\g_semantex_data_tl_provide:nn { semantexvariable } { argdots }
+\g_semantex_data_tl_set:nnn { semantexvariable } { argdots } {\dots}
+
+\g_semantex_data_tl_provide:nn { semantexvariable } { symbol }
+
+\g_semantex_data_seq_provide:nn { semantexvariable } { commands_sequence }
+
+
+\g_semantex_data_bool_provide:nn { semantexvariable } { upper_grading }
+\g_semantex_data_bool_set_true:nn { semantexvariable } { upper_grading }
+
+\g_semantex_data_bool_provide:nn { semantexvariable } { output }
+
+\g_semantex_data_tl_provide:nn { semantexvariable } { output_options }
+
+\g_semantex_data_bool_provide:nn { semantexvariable } { first_arg }
+\g_semantex_data_bool_set_true:nn { semantexvariable } { first_arg }
+
+\g_semantex_data_bool_provide:nn { semantexvariable } { first_upper }
+\g_semantex_data_bool_set_true:nn { semantexvariable } { first_upper }
+
+\g_semantex_data_bool_provide:nn { semantexvariable } { first_lower }
+\g_semantex_data_bool_set_true:nn { semantexvariable } { first_lower }
+
+\g_semantex_data_bool_provide:nn { semantexvariable } { par }
+\g_semantex_data_bool_set_true:nn { semantexvariable } { par }
+
+\g_semantex_data_bool_provide:nn { semantexvariable } { rightreturnbeforerender }
+
+\g_semantex_data_tl_provide:nn { semantexvariable } { parseoptions }
+
+\g_semantex_data_tl_provide:nn { semantexvariable } { texclass }
+
+
+%\tl_set:Nn\g_objectmath_semantexvariable_upper_index { hej }
+%\tl_set:Nn \g_semantexvariable_output { semantexvariable }
+%\bool_new:N \g_semantexvariable_output_if_provided
+%\bool_set_true:N \g_semantexvariable_output_if_provided
+
+
+\newvariableclass{semantexvariable}[
+	%parent=semantexvariable,
+	symbol=,
+	gradingpos=upper,
+	%upper=,
+	%lower=,
+	leftpar=(,
+	rightpar=),
+	par=normal,
+	leftspar=(,
+	rightspar=),
+	sparsize=normal,
+	%arg=,
+	ifoutput=false,
+	output=semantexvariable,
+	novaluekeys={
+		{bullet}{d={\noexpand\semantexbullet}},
+		{doublebullet}{d={\noexpand\semantexdoublebullet}},
+		{prime}{upper={\prime}},
+		{'}{prime},
+		{''}{prime,prime},
+		{'''}{prime,prime,prime},
+		{ibullet}{i={\noexpand\semantexbullet}},
+		{idoublebullet}{i={\noexpand\semantexdoublebullet}},
+		{*}{bullet},
+		{**}{doublebullet},
+		{i*}{ibullet},
+		{i**}{idoublebullet},
+		{smash}{command=\noexpand\smash},
+%		(widebar}{command=\noexpand\widebar},%For unknown reasons, this only seems to work when run as a primitive
+		{tilde}{command=\noexpand\tilde},
+		{widetilde}{command=\widetilde},
+		{overline}{command=\noexpand\overline},
+		{bar}{command=\noexpand\bar},
+		{bold}{command=\noexpand\mathbf},
+		{roman}{command=\noexpand\mathrm},
+		{mathord}{texclass=\mathord},
+		{mathbin}{texclass=\mathbin},
+		{mathop}{texclass=\mathop},
+		{mathrel}{texclass=\mathrel},
+		{leftreturn}{leftreturn=},
+		{innerreturn}{innerreturn=},
+		{rightreturn}{rightreturn=},
+		{return}{return=},
+		{spar}{spar=},
+		{parse}{parse=},
+		{par}{ifpar=true},
+		{nopar}{ifpar=false},
+		% The following four commands do not work due to expansion issues:
+%		{useargwithkeyval}{useargwithkeyval=},
+%		{argwithkeyval}{
+%			valuekeys={
+%				{arg}{argwithkeyval={\noexpand\l_semantex_key_value_temp}},
+%			},
+%		},
+%		{argwithnovaluekeys}{
+%			valuekeys={
+%				{arg}{argwithnovaluekeys={\noexpand\l_semantex_key_value_temp}},
+%			},
+%		},
+%		{argwithoutkeyval}{
+%			valuekeys={
+%				{arg}{argwithoutkeyval={\noexpand\l_semantex_key_value_temp}},
+%			},
+%		},
+%		{argwithonenovaluekey}{
+%			valuekeys={
+%				{arg}{argwithonenovaluekey={\noexpand\l_semantex_key_value_temp}},
+%			},
+%		},
+	},
+	valuekeys={
+		{default}{si={#1}},
+%		{arg}{argwithkeyval={#1}},
+		{arg}{argwithnovaluekeys={#1}},
+		{degreedefault}{sd={#1}},
+		{parseoptions}{
+			execute={
+				\semantexdataputright{parseoptions}{#1}
+			},
+		},
+	},
+%	argwithnovaluekeys,
+	argvaluekeys={
+		{default}{standardsep={#1}},
+	},
+	argnovaluekeys={
+		{slot}{slot=},
+		{-}{slot=},
+		{*}{slot=},
+		{...}{dots=},
+	},
+	%command=,
+%	useargwithkeyval,
+]
\ No newline at end of file


Property changes on: trunk/Master/texmf-dist/tex/latex/semantex/semantex.sty
___________________________________________________________________
Added: svn:eol-style
## -0,0 +1 ##
+native
\ No newline at end of property
Modified: trunk/Master/tlpkg/bin/tlpkg-ctan-check
===================================================================
--- trunk/Master/tlpkg/bin/tlpkg-ctan-check	2020-05-31 21:10:58 UTC (rev 55362)
+++ trunk/Master/tlpkg/bin/tlpkg-ctan-check	2020-05-31 21:11:43 UTC (rev 55363)
@@ -654,7 +654,7 @@
     scrjrnl scrlttr2copy scsnowman
     sdaps sdrt sduthesis
     secdot secnum section sectionbox sectionbreak sectsty seealso
-    selectp selinput selnolig semantic semantic-markup semaphor
+    selectp selinput selnolig semantex semantic semantic-markup semaphor
     seminar semioneside semproc sepfootnotes sepnum seqsplit
     serbian-apostrophe serbian-date-lat serbian-def-cyr serbian-lig
     sesamanuel sesstime setdeck setspace seuthesis seuthesix sexam

Modified: trunk/Master/tlpkg/tlpsrc/collection-latexextra.tlpsrc
===================================================================
--- trunk/Master/tlpkg/tlpsrc/collection-latexextra.tlpsrc	2020-05-31 21:10:58 UTC (rev 55362)
+++ trunk/Master/tlpkg/tlpsrc/collection-latexextra.tlpsrc	2020-05-31 21:11:43 UTC (rev 55363)
@@ -1038,6 +1038,7 @@
 depend seealso
 depend selectp
 depend selinput
+depend semantex
 depend semantic
 depend semantic-markup
 depend semioneside

Added: trunk/Master/tlpkg/tlpsrc/semantex.tlpsrc
===================================================================