%&program=xelatex
%&encoding=UTF-8 Unicode

\documentclass{report}
\addtolength{\textwidth}{3cm}
\addtolength{\textheight}{5cm}
\addtolength{\oddsidemargin}{-1.5cm}
\addtolength{\evensidemargin}{-1.5cm}
\addtolength{\topmargin}{-2.5cm}
\usepackage{fontspec}
\setmainfont{GFS Porson}
\setsansfont{Lucida Grande}

\newcommand{\firststring}{Σημεῖόν ἐστιν, οὗ μέρος οὐθέν.}
\newcommand{\Omegastring}{\Omegastringi\  \Omegastringii}
\newcommand{\Omegastringi}{Ὀνήσιμος}
\newcommand{\Omegastringii}{Ὀνήσιμος}
\newcommand{\secondstring}{decomposed: Ὀ (i.e. Omicron and psili: Ὀ): \Omegastring}
\newcommand{\thirdstring}{pre-prepared: Ὀ (i.e. Omicron with psili): \Omegastring}

\newcommand{\secondtest}{\\\secondstring}
\newcommand{\thirdtest}{\\\addfontfeature{Script=Greek}\thirdstring}
\newcommand{\noseconddtest}[1]{\\\textsf{#1 seems not to support the ‘psili’ character.} \Omegastringii}
\newcommand{\noseconddtestii}[1]{\\#1 seems not to support the ‘psili’ character. \Omegastringii}
\newcommand{\nothirdtest}[1]{\\#1 does not need ‘Script=Greek’.}


\begin{document}
\large
\setlength{\parindent}{0pt}
\begin{description}
\setmainfont{GFS Artemisia} 
\item[GFS Artemisia:] \firststring \secondtest \thirdtest
%
\setmainfont{GFS Artemisia Bold}
\item[GFS Artemisia Bold:] \firststring \secondtest \thirdtest
%
\setmainfont{GFS Artemisia Italic}
\item[GFS Artemisia Italic:] \firststring \secondtest \thirdtest
%
\setmainfont{GFS Artemisia Bold Italic}
\item[GFS Artemisia Bold Italic:]  \firststring \secondtest \thirdtest
%
\end{description}
\medskip
\begin{description}
\setmainfont{GFS Baskerville Regular}
\item[\textsf{GFS Baskerville}:] \firststring \noseconddtest{Baskerville}
\\\Omegastring
%
\end{description}
\medskip
\begin{description}
\setmainfont{GFS Bodoni}
\item[GFS Bodoni:] \firststring %\noseconddtestii{Bodoni}
\secondtest \thirdtest
%
\setmainfont{GFS Bodoni Bold}
\item[GFS Bodoni Bold:] \firststring%\ \Omegastringii
\secondtest \thirdtest
%
\setmainfont{GFS Bodoni Italic}
\item[GFS Bodoni Italic:] \firststring %\ \Omegastringii
\secondtest \thirdtest
%
\setmainfont{GFS Bodoni Bold Italic}
\item[GFS Bodoni Bold Italic:] \firststring%\ \Omegastringii
\secondtest \thirdtest
%
\setmainfont{GFS BodoniClassic}
\item[\textsf{GFS BodoniClassic}:] \firststring\ \Omegastringii
\\\Omegastring
%
\end{description}
\medskip
\begin{description}
\setmainfont{GFS Didot Regular}
\item[GFS Didot Regular:] \firststring \noseconddtestii{Didot}
\secondtest \thirdtest
%
\setmainfont{GFS Didot Bold}
\item[GFS Didot Bold:] \firststring%\ \Omegastringii
\secondtest \thirdtest
%
\setmainfont{GFS Didot Italic}
\item[GFS Didot Italic:] \firststring%\ \Omegastringii
\secondtest \thirdtest
%
\setmainfont{GFS Didot Bold Italic}
\item[GFS Didot Bold Italic:] \firststring%\ \Omegastringii
\secondtest \thirdtest
%
\setmainfont{GFS Didot Classic}
\item[\textsf{GFS Didot Classic}:] \firststring%\ \Omegastringii
\\\Omegastring
%
\end{description}
\medskip
\begin{description}
\setmainfont{GFS Elpis}
\item[GFS Elpis:]  \firststring \secondtest \thirdtest
%
\setmainfont{GFS Gazis}
\item[\textsf{GFS Gazis}:] \firststring %\noseconddtest{Gazis}
\\\Omegastring
%
\end{description}
\medskip
\begin{description}
\setmainfont{GFS Neohellenic}
\item[GFS Neohellenic:]  \firststring \secondtest \thirdtest
%
\setmainfont{GFS Neohellenic Bold}
\item[GFS Neohellenic Bold:] \firststring \secondtest \thirdtest
%
\setmainfont{GFS Neohellenic Italic}
\item[GFS Neohellenic Italic:] \firststring \secondtest \thirdtest
%
\setmainfont{GFS Neohellenic Bold Italic}
\item[GFS Neohellenic Bold Italic:] \firststring \secondtest \thirdtest
%
\end{description}
\medskip
\begin{description}
\setmainfont{GFS Olga}
\item[\textsf{GFS Olga}:] \firststring %\noseconddtest{Olga}
\\\Omegastring
%
\setmainfont{GFSComplutumClassic-Regular}
\item[\textsf{GFSComplutumClassic-Regular}:] \firststring %\noseconddtest{Complutum}
\\\Omegastring
%
\setmainfont{GFS Porson}
\item[\textsf{GFS Porson}:] \firststring %\noseconddtest{Porson}
\\\Omegastring
%
\setmainfont{GFS Solomos}
\item[\textsf{GFS Solomos}:] \firststring %\noseconddtest{Solomos}
\\\Omegastring
%
\setmainfont{GFS Theokritos}
\item[GFS Theokritos:] \firststring \secondtest \nothirdtest{Theokritos}
%
\end{description}

\setmainfont{GFS Bodoni}\small
Where the font name is given in sans-serif face (8 cases), 
there is no accompanying Latin alphabet within the font.

\end{document}