Plan 9 from Bell Labs’s /usr/web/sources/contrib/fernan/nhc98/src/libraries/HaXml/tests/xml-conformance/ibm/xml-1.1/not-wf/P02/ibm02n10.xml
<?xml version="1.1" encoding="UTF-8"?> <!DOCTYPE root [ <!ELEMENT root ANY> <!ENTITY ent "BAD"> ]> <root></root> <!-- Entity Replacement text contains an embeded control character x12 -->