Plan 9 from Bell Labs’s /usr/web/sources/contrib/fernan/nhc98/src/libraries/HaXml/tests/xml-conformance/eduni/xml-1.1/004.xml
<!-- External general entity has later version number (no decl means 1.0) --> <!DOCTYPE foo [ <!ELEMENT foo ANY> <!ENTITY ent SYSTEM "004.ent"> ]> <foo>&ent;</foo>