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From: Vit Zyka <vit.zyka@seznam.cz>
Newsgroups: gmane.comp.tex.context
Subject: Re: TeX control sequence inside XML param
Date: Thu, 27 Jan 2005 16:54:40 +0100
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Hans Hagen wrote:
> Vit Zyka wrote:
> 
>> Hallo,
>>
>> it is possible to use TeX control sequence inside XML param? How?
>> Example:
>>
>> <figure file="file.pdf" width=".45\textwidth" />
>>                                   ^^^^^^^^^^
>> \defineXMLenvironment[figure][file=,width=]
>>   {}
>>   {\externalfigure[\XMLop{file}][width=\XMLop{width}]}
> 
> 
> Hm. You're lucky. We should make a test suite (at the wiki) to make sure 
> that this kind of stuff keeps working -)
> 
> \starttext
> 
> \defineXMLentity[ctx-var-textwidth] {\textwidth}

I seeee! I might come to me... Actually I'd like to solve a bit more 
complex task:

\starttext

\defineXMLentity[ctx-var-textwidth] {\textwidth}

\newcount\FigNo
\defineXMLenvironment[float][]
   {\defineXMLpush[caption]%
    \global\FigNo=0
   }
   {\placefigure{\XMLflush{caption}}%
      {\dorecurse{\FigNo}%
         {\edef\filewithpath{\XMLpop{dir-fig}\getvalue{file:\recurselevel}}%
          \edef\param{\getvalue{param:\recurselevel}}%
          \externalfigure[\filewithpath][\param]}}%
   }
\defineXMLenvironment[figure][file=,context=]
   {}
   {\global\advance\FigNo by1 %
    \expanded{\setvalue{file:\the\FigNo}{\XMLop{file}}}%
    \expanded{\setvalue{param:\the\FigNo}{\XMLop{context}}}%
   }

\startXMLdata
<float>
   <figure file="cow.pdf" context="width=.5&ctx-var-textwidth;" />
   <figure file="hacker.jpg" context="width=3cm" />
   <caption>Cow and hacker.</caption>
</float>
\stopXMLdata

\stoptext