Invalid XML test cases are intentionally designed to violate defined structures. They are successful when the suite correctly identifies them as invalid, demonstrating that the schema properly enforces its intended constraints.

For example, the following DocBook XML file will be flagged as a pass by the test suite, as it does not adhere to the structures defined within the schema:

<book xmlns="http://docbook.org/ns/docbook" xml:id="b-book" role="fullText">
    <info>
      <title>biblioset-role-attribute-tests</title>
      <biblioset role="isbn"/>
    </info>
  </book>