Everything inside a CDATA section that looks like starting a new tag
is not handled:
<programlisting><![CDATA[<?xml version="1.0"
encoding="ISO-8859-1"?>
<xsl:stylesheet
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="1.0">
...
$ po4a-gettextize -f sgml -m db2latex-howto.xml
...
db2latex-howto.xml:185:0: Unknown SGML event type:
Michael
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