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%D \module
%D [ file=x-xfdf,
%D version=2011.09.07,
%D title=\CONTEXT\ XML Modules,
%D subtitle=\XFDF,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.
%D This is a revival of using \XFDF, but now in a more \MKIV-ish way. We
%D supported it long ago already in \MKII\ but never used it at a large
%D scale (not that much user interest anyway).
\startmodule[xfdf]
% see xfdf-001.xfdf and xfdf-001.tex
% %D Possible speedup but hardly worth the trouble.
%
% \startluacode
%
% local hashes = { } table.setmetatableindex(hashes,function(t,k) local v = { } t[k] = v return v end)
%
% function xml.functions.xfdf_collect_values(root)
% local hash = hashes[root]
% for c in xml.collected(root,"/xfdf/fields/field/value") do
% hash[xml.parent(c).at.name] = c
% end
% end
%
% function xml.functions.xfdf_get_values(root,name)
% return hashes[root][name]
% end
%
% function lxml.xfdf_get_values(root,name)
% xml.sprint(hashes[lxml.id(root)][name])
% end
%
% \stopluacode
%
% \def\xfdfvalue#1#2%
% {\ctxlua{lxml.xfdf_get_values("#1","#2")}}
\startxmlsetups xfdf:define
\xmlsetsetup{#1}{*}{xfdf:*}
% \xmlfilter {#1}{./function(xfdf_collect_values)}
\stopxmlsetups
\xmlregisterns{xfdf}{http://ns.adobe.com/xfdf/}
\xmlregisterdocumentsetup{xfdf}{xfdf:define}
\startxmlsetups xfdf:value
\xmlflush{#1}
\stopxmlsetups
\def\xfdfload #1#2{\xmlloadonly{#1}{#2}{xfdf}}
\def\xfdfvalue#1#2{\xmlfirst{#1}{/xfdf/fields/field[@name='#2']/value}}
\def\xfdftext #1#2{\xmlfirst{#1}{/xfdf/fields/field[@name='#2']/value/paragraphs()}}
% \startxmlsetups xfdf:b
% \bold{\xmlflush{#1}}
% \stopxmlsetups
% \xfdfload {whatever}{xfdf-001.xfdf}
% \xfdfvalue{whatever}{somefield}
\stopmodule
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