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+%D \module
+%D   [       file=lxml-sor,
+%D        version=2009.08.24,
+%D          title=\CONTEXT\ \XML\ Support,
+%D       subtitle=Sorting,
+%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 VERY EXPERIMENTAL!
+
+\writestatus{loading}{ConTeXt XML Support / Sorting}
+
+\registerctxluafile{lxml-sor}{1.001}
+
+\unprotect
+
+% the flusher is unexpandable so that it can be used in tables (noalign
+% interferences)
+
+\unexpanded\def\xmlresetsorter     #1{\ctxlxml{sorters.reset("#1")}}
+\unexpanded\def\xmladdsortentry#1#2#3{\ctxlxml{sorters.add("#1","#2",\!!bs#3\!!es)}}
+\unexpanded\def\xmlshowsorter      #1{\ctxlxml{sorters.show("#1")}}
+           \def\xmlflushsorter   #1#2{\ctxlxml{sorters.flush("#1","#2")}}
+\unexpanded\def\xmlsortentries     #1{\ctxlxml{sorters.sort("#1")}}
+
+\protect \endinput
+
+\startbuffer[test]
+<demo>
+  <entry>
+    <category>one</category>
+    <key>alpha</key>
+    <content>alpha indeed</content>
+  </entry>
+  <entry>
+    <category>one</category>
+    <key>gamma</key>
+    <content>gamma indeed</content>
+  </entry>
+  <entry>
+    <category>one</category>
+    <key>beta</key>
+    <content>beta indeed</content>
+  </entry>
+  <entry>
+    <category>two</category>
+    <key>alpha</key>
+    <content>alpha again</content>
+  </entry>
+  <entry>
+    <category>two</category>
+    <key>gamma</key>
+    <content>gamma again</content>
+  </entry>
+  <entry>
+    <category>two</category>
+    <key>beta</key>
+    <content>beta again</content>
+  </entry>
+</demo>
+\stopbuffer
+
+\startxmlsetups xml:mysetups
+    \xmlsetsetup{\xmldocument}{demo|entry|content}{xml:*}
+\stopxmlsetups
+
+\xmlregistersetup{xml:mysetups}
+
+\startxmlsetups xml:demo
+    \xmlresetsorter{demo}
+    \xmlfilter{#1}{entry/command(xml:entry:getkeys)}
+    \blank sortkeys: \blank\xmlshowsorter{demo}\blank
+    \xmlsortentries{demo}
+    \xmlflushsorter{demo}{xml:entry:flush}
+\stopxmlsetups
+
+\startxmlsetups xml:entry:getkeys
+    \xmladdsortentry{demo}{#1}{\xmltext{#1}{category}}
+    \xmladdsortentry{demo}{#1}{\xmltext{#1}{key|entry}}
+\stopxmlsetups
+
+\startxmlsetups xml:entry:flush
+    \xmltext{#1}{content}\par
+\stopxmlsetups
+
+\startxmlsetups xml:entry
+    \xmltext{#1}{content}\par
+\stopxmlsetups
+
+\starttext
+    \xmlprocessbuffer{main}{test}{}
+\stoptext