Plan 9 from Bell Labs’s /usr/web/sources/contrib/fernan/nhc98/src/libraries/HaXml/tests/xml-conformance/ibm/not-wf/P57/ibm57n01.xml
<?xml version="1.0"?> <!-- syntax test for Production 57--> <!DOCTYPE root [ <!ELEMENT root EMPTY> <!ATTLIST root att NMTOKEN (a|b) #IMPLIED> ]> <root> This test case tests the illegal enumerated types </root>
