See tests that have roundTrip="false" in namespaces.tdml. All of these tests should round trip, but the xml namespaces created in the infoset are incorrect. For example, the namespaces_qnames test result in the following infoset:

<e xmlns:ex2="http://example.com/1" xmlns="http://example.com/1">

  <len>5</len>

  <num>12345</num>

</e>

In this example, num should be NoNamespace because it's defined as a local element and elementFormDefault="unqualified", but because xmlns is defined in the infoset, it is in the ex2 namespace. This schema should instead look something like this:

<ex:e xmlns:ex2="http://example.com/1">

  <ex2:len>5</ex2:len>

  <num>12345</num>

</ex2:e>

Numerous other tests in the namespaces.tdml file exhibit simliar behaviors, and so roundTrip is set to false.