Plan 9 from Bell Labs’s /usr/web/sources/contrib/fernan/nhc98/src/libraries/HaXml/tests/xml-conformance/ibm/not-wf/P60/ibm60n02.xml
<?xml version="1.0"?> <!-- syntax test for Production 60--> <!DOCTYPE Java [ <!ELEMENT Java ANY> <!ELEMENT one EMPTY> <!ATTLIST one chapter CDATA #Implied> ]> <Java> <one chapter="Introduction"></one> Negative test. Case Sensitive </Java>