[tex-eplain] [solved] Re: Undefined label

[Rodolfo Medina]

On Tue, Apr 28, 2009 at 06:49:26PM +0100, Rodolfo Medina wrote:

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


Oleg Katsitadze <olegkat at gmail.com> writes:

> Taken from \@definelabel in xeplain.tex:
>
>     \expandafter\ifx\csname\xrlabel{#1}\endcsname \relax
>       % Label is undefined.
>     \else
>       % Label is defined.
>     \fi


Thanks, this seems to work.
Rodolfo