Plan 9 from Bell Labs’s /usr/web/sources/contrib/fernan/nhc98/src/libraries/HaXml/tests/xml-conformance/ibm/invalid/P56/out/ibm56i07.xml
<test> <id UniqueName="AC456"></id> <idref reference="@456"></idref> Negative test for validity constraint of IDREF. In an attribute decl, values of type IDREF does not match the name production </test>
