Plan 9 from Bell Labs’s /usr/web/sources/contrib/fernan/nhc98/src/libraries/HaXml/tests/xml-conformance/ibm/not-wf/P54/ibm54n02.xml
<?xml version="1.0"?> <!-- test for Production 54--> <!DOCTYPE AttrType [ <!ELEMENT AttrType ANY> <!ELEMENT a EMPTY> <!ATTLIST a att PCDATA #IMPLIED> ]> <AttrType> Giving a wrong AttType for the attribute. <a att="23" ></a> </AttrType>