Plan 9 from Bell Labs’s /usr/web/sources/contrib/fernan/nhc98/src/libraries/HaXml/tests/xml-conformance/ibm/valid/P03/ibm03v01.xml
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE book [ <!ELEMENT book ANY> <!-- This test case covers 0 legal character ranges plus 4 discrete legal characters for production 03. --> <?NAME_20- _09- _0D- _0A- This is a PI target ?> ]> <book/>