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From: scarso luigi <scarsoluigi@libero.it>
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Subject: Re: DocBookInConTeXt customization?
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> I did not know what to do with such attributes as role, whose range of
> values is not constrained. Luigi's remark gives me an idea: I should
> put a hook in the stylesheet for the user's own formatting
> command. Something like \attributeaction[para][role]. The user could
> define such an action with something like
> \defineXMLattributeaction[para][role].
> 
> The attribute action should be invoked within a group in order to
> allow the user to change fonts etc. for this element. Therefore
> context cannot invoke the attribute action automatically, because it
> cannot know where it should do so. For example, some mappings for the
> opening tag invoke \egroup; if the attribute action had been invoked
> automatically, its scope would be ended immediately.
When I just start to play with xml/context, I realize a test for table
(i'm still playing with it) in which I write something like

<table>
<!-- ... other elements -->
<row>
<entry role="setupentry[nx=2,background=color,backgroundcolor=red]">
blahh blahh
</entry>
<!-- ... other elements -->
</row>
<!-- ... other elements -->
</table>

and define

\defineXMLpickup [entry] [role=]%
%%Open tag
{\expanded{\beforesplitstring{\XMLpar{entry}{role}{}}}\at [\to\Type%  
% get  ..options..]
\expanded{\aftersplitstring{\XMLpar{entry}{role}{}}}\at
[\to\rawOptions%  
% get  ..options..
\expanded{\beforesplitstring{\rawOptions}}\at ]\to\Options%  
\doifelse{\Type}{setupentry}%
{%then
\expanded{\bTD[\Options]}
}{%else
\bTD%  
}}%
%%Close tag
{\eTD}

Is your way, Simon ?