Plan 9 from Bell Labs’s /usr/web/sources/contrib/fernan/nhc98/src/libraries/HaXml/tests/xml-conformance/eduni/namespaces/1.0/023.xml
<?xml version="1.0"?> <!-- Illegal use of 1.1-style prefix unbinding in 1.0 document --> <a:foo xmlns:a="http://example.org/namespace"> <a:foo xmlns:a=""/> </a:foo>
