I am trying to select specific elements from an XML document to make
anthologies, and still retain the original numbering, by using
\xmldoifelse; if the node matches, it is printed, and if it is not, the
head number is incremented, to get something like this:
1 First Section (first match)
4 Fourth Section (second match, but fourth element in the XML file)
But the fail condition is not being triggered properly. Here are the files:
%
% anthologize.xml
%
\def\incrementheadnumber[#1]{\setupheadnumber[#1]
[\numexpr\namedheadnumber{#1}+1\relax]}
\startxmlsetups xml:selectivity:*
\xmlsetsetup{\xmldocument}{*}{-}
\xmlsetsetup{\xmldocument}{stuff|div|head}{xml:selectivity:*}
\stopxmlsetups
\xmlregisterdocumentsetup{selectivity}{xml:selectivity:*}
% Here is the difficulty.
\startxmlsetups{xml:selectivity:stuff}
\xmldoifelse{#1}{/div[match()==1 or match()==4]/all()}
{
\xmlflush{#1}
} {
\incrementheadnumber[section]
}
\stopxmlsetups
\startxmlsetups{xml:selectivity:div}
\xmlflush{#1}
\stopxmlsetups
\startxmlsetups{xml:selectivity:head}
\startsection[title={\xmlflush{#1}}]\stopsection
\stopxmlsetups
\starttext
\xmlprocessfile{selectivity}{bob.xml}{}
\stoptext
%
% bob.xml
%
<stuff>
<div>
<head>First Section</head>
</div>
<div>
<head>Second Section</head>
</div>
<div>
<head>Third Section</head>
</div>
<div>
<head>Fourth Section</head>
</div>
</stuff>
The result is that only the first and fourth heads are printed, as desired,
but I end up with:
1 First Section
2 Fourth Section.
I have used the \incrementheadnumber function elsewhere, and it works fine.
If I replace \incrementheadnumber[section] with \xmlflush{#1}, it prints:
1 First Section
2 Fourth Section
3 First Section
4 Second Section
5 Third Section
6 Fourth Section
So it seems to be properly triggering the true condition, but not the false
condition, and I cannot figure out how to fix it. Using ConTeXt 2017.04.08
and LuaTeX 1.0.3. I do thank you for your help.
Sincerely,
Gerard Keiser
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