Plan 9 from Bell Labs’s /usr/web/sources/contrib/fernan/nhc98/src/libraries/HaXml/tests/xml-conformance/ibm/not-wf/P83/ibm83n05.xml
<?xml version="1.0"?> <!DOCTYPE root [ <!ELEMENT root (#PCDATA)> <!ATTLIST root att CDATA #IMPLIED> <!--* Missing PubidLiteral in PublicID *--> <!NOTATION JPGformat PUBLIC > <!ENTITY aImage SYSTEM "image.jpg" NDATA JPGformat> ]> <root/>