[pstricks] Nodes with double borders

[Herbert Voss]

Hendrik Maryns wrote:

> After much trailing and doubting, I finally took a little time to look 
> at pst-tree, and got nice results immediately, so I am very 
> enthousiastic now.  Only one thing I want now that I can't achieve: for 
> representing FSAs, I'd like nodes of the type circnode, but with TWO 
> concentrical circles.  I tried \Tcirc{\Tcirc{something}}, but that gave 
> strange results...

something like this?

\documentclass{article}
\usepackage{pst-tree}
\begin{document}
\pstree{\Tcircle{root}}{
   \Tcircle[doubleline=true]{A}
   \Tcircle{B}
}
\end{document}

Herbert