Plan 9 from Bell Labs’s /usr/web/sources/contrib/fernan/nhc98/src/libraries/HaXml/tests/xml-conformance/sun/valid/sa01.xml
<?xml version='1.0' standalone='yes'?> <!DOCTYPE root [ <!ELEMENT root (child)*> <!ELEMENT child (#PCDATA)> ]> <root> <child> The whitespace around this element would be invalid as standalone were the DTD external. </child> </root>