[pstricks] Testing key-value pairs and \psset

Hensh, Richard hensh at math.msu.edu
Thu Dec 6 18:49:51 CET 2007

Suppose that

\define at key[psset]{pNode}{PointName}{\edef\psk at PointName{#1}}%

How do I test for each of the following?

        \psset{PointName={}} or \psset{PointName=}



I've tried looking at the pstricks packages but I can't figure out what anyone is doing along these lines.


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