[tex-eplain] Undefined label

Rodolfo Medina rodolfo.medina at gmail.com
Tue Apr 28 19:49:26 CEST 2009


Inside a certain definition, I want to create a condition on the existence of
an undefined label: I want to say something like:

 if \refn{#1} is undefined (i.e., if #1 is an undefined label), then...
 else...
 fi

.  How can I write that?  I tried with `\ifx\refn{#1}\empty...' but doesn't
work.


Thanks indeed for any help
Rodolfo



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