tests/fixtures/input/xmllint/missingdtd.xml:2: warning: failed to load external entity "tests/fixtures/input/xmllint/missingdtdref"
<!DOCTYPE a SYSTEM "missingdtdref">
                                   ^
tests/fixtures/input/xmllint/missingdtd.xml:5: namespace error : Namespace prefix xlink for href on b is not defined
  <b xlink:href="http://fakeurl.net">b text</b>
                                    ^
warning: failed to load external entity "tests/fixtures/input/xmllint/missingdtdref"
validity error : Could not load the external subset "missingdtdref"
Document tests/fixtures/input/xmllint/missingdtd.xml does not validate