Plan 9 from Bell Labs’s /usr/web/sources/contrib/fernan/nhc98/src/libraries/HaXml/tests/xml-conformance/ibm/invalid/P69/ibm69i04.xml
<?xml version="1.0" standalone='no'?> <!DOCTYPE root [ <!ELEMENT root (#PCDATA)* > <!ENTITY % pe1 SYSTEM "ibm69i04.ent"> %pe1; ]> <root> pcdata content </root> <!--* a invalid test for P69 VC:Entity Declared *-->