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From: Simon Pepping <spepping@scaprea.hobby.nl>
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Subject: Re: DocBook probleempje
Date: Mon, 11 Feb 2002 22:15:47 +0100
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On Sun, Feb 10, 2002 at 10:04:15PM +0100, Hans Hagen wrote:

First the problem in English:

I want to render the revhistory as a table. But it may have a large
range of fields. Preferably I would like to be able to see which
fields occur, and only include those columns.

This code works fine, and it teaches me that it is not necessary to
write to an auxiliary file. All data can be built in memory.

But I want more. The following is an appropriate test text. Each row
may show a different selection from the possible fields. And all rows
together may only use a subset of the set of possible fields. I only
want to include the fields actually used; so I do not want to show the
field authorinitials if that is not used in any of the rows.

<revhistory>
    <revision>
       <revnumber>0.06</revnumber>
       <date>2001-01-08</date>
       <authorinitials>gjf</authorinitials>
        <revremark>
          Changed date format (YYYY-MM-DD)
       </revremark>
    </revision>
    <revision>
       <revnumber>0.07</revnumber>
       <date>2001-01-09</date>
        <revremark>
          Changed date format (YYYY-MM-DD) again
       </revremark>
    </revision>
    <revision>
       <revnumber>0.08</revnumber>
       <authorinitials>gjf</authorinitials>
        <revremark>
          Changed date format (YYYY-MM-DD) once more
       </revremark>
    </revision>
</revhistory>

> Hi Simon,
> 
> Your problem can be solved in the following way: [i cc to teh list since it 
> may be instructive]
> 
> % output=pdftex
> 
> % This is the first pass: add an \bTD .. \eTD (or \bTH .. eTH) entry
> 
> \def\WhatAHackA#1%
>    {\defineXMLenvironmentsave[#1]
>       {\bTD#1\eTD\defineXMLignore[#1]}
>       \donothing}
> 
> % and this the second pass: actually typeset them
> 
> \def\WhatAHackB#1%
>    {\defineXMLpickup[#1]
>       \bTD
>       \eTD}
> 
> % here we do the two passes (one can add an additional pass
> % over the <revision> element, or even better: store the
> % entries, and flush them when needed skipping empty elements)
> 
> \defineXMLenvironmentsave[revhistory]
>     {\bgroup}
>     {\def\HackList{revnumber,date,revremark,authorinitials}
>      \defineXMLenvironment[revision] \donothing \donothing
>      \processcommacommand[\HackList]\WhatAHackA
>      \bTABLE
>      \bTR\XMLflush{revhistory}\eTR
>      \defineXMLpickup[revision] \bTR \eTR
>      \processcommacommand[\HackList]\WhatAHackB
>      \XMLflush{revhistory}
>      \eTABLE
>      \egroup}
> 

Regards, Simon

-- 
Simon Pepping
email: spepping@scaprea.hobby.nl