Plan 9 from Bell Labs’s /usr/web/sources/contrib/fernan/nhc98/src/libraries/HaXml/tests/xml-conformance/ibm/not-wf/P40/ibm40n04.xml
<?xml version="1.0"?> <!DOCTYPE root [ <!ELEMENT root ANY> <!ATTLIST root attr1 CDATA #IMPLIED> <!ATTLIST root attr2 CDATA #IMPLIED> ]> <!root attr1="any">wrong begining sequence in start tag</root>