Plan 9 from Bell Labs’s /usr/web/sources/contrib/fernan/nhc98/src/libraries/HaXml/tests/xml-conformance/ibm/xml-1.1/not-wf/P02/ibm02n15.xml
<?xml version="1.1" encoding="UTF-8"?> <!-- Bad Comment 0xf --> <?Bad PI 0xf ?> <root><![CDATA[ 0xf ]]></root>