Plan 9 from Bell Labs’s /usr/web/sources/contrib/fernan/nhc98/src/libraries/HaXml/tests/xml-conformance/ibm/invalid/P28/ibm28i01.xml
<?xml version="1.0" encoding='UTF-8'?> <!DOCTYPE tiger [ <!ELEMENT tiger EMPTY> ]> <!-- This against VC of P28. The Name in the document type declaration does not match the element type of the root element. --> <animal/>