Plan 9 from Bell Labs’s /usr/web/sources/contrib/fernan/nhc98/src/libraries/HaXml/tests/xml-conformance/ibm/xml-1.1/valid/P02/ibm02v06.xml
<?xml version="1.1" encoding="UTF-8"?> <!DOCTYPE root [ <!ELEMENT root ANY> <!ENTITY e SYSTEM "ibm02v06.ent"> ]> <root></root>