Plan 9 from Bell Labs’s /usr/web/sources/contrib/fernan/nhc98/src/libraries/HaXml/tests/xml-conformance/ibm/invalid/P39/out/ibm39i03.xml
<root><a></a><b> <c></c> content of b element <a></a> could not have 'a' as 'b's content </b></root>