[pstricks] Where to place definitions in raw postscript

[Christoph Bersch]

Hi!

What is the best (right) place to put definitions and calculations in
raw postscript (both in 'normal' documents and in own packages)?
As I'm writing my first package for PSTricks I experienced some problems
with this.
The following code does _not_ work. I get errors when viewing the
ps-file with gv

%--------------------------------------
\documentclass{article}
\usepackage{pst-node,pst-plot}
\begin{document}
\begin{pspicture}(5,5)
\SpecialCoor
\psline(!%
        /testvar 1.5 def
        0 testvar)%
       (! testvar testvar)
\end{pspicture}
\end{document}
%---------------------------------------

The error is:

Error: /undefined in testvar
Operand stack:
   --nostringval--
[...]

But the following code works:
%---------------------------------------
\documentclass{article}
\usepackage{pst-node,pst-plot}
\begin{document}
\begin{pspicture}(5,5)
\SpecialCoor
\pnode(!%
      /testvar 1.5 def
      0 testvar){nodeA}
\pnode(! testvar testvar){nodeB}
\psline(nodeA)(nodeB)
\end{pspicture}
\end{document}
%---------------------------------------

So what is the problem with the first document in contrast to the
second? Isn't it possible to use postscript definitions with \psline or
are there some stupid errors I am making?

Thanks for help
Christoph