Plan 9 from Bell Labs’s /usr/web/sources/contrib/fernan/nhc98/src/libraries/HaXml/tests/xml-conformance/ibm/xml-1.1/not-wf/P77/ibm77n13.dtd
<?xml version="1.0" encoding='UTF-8'?> <![INCLUDE [ <!ELEMENT root ANY> <!ENTITY e SYSTEM "ibm77n13.ent"> ]]>