Some tests are showing "No_Namespace" as the namespace, but this should only be an internal thing and shouldn't show in the xml result. This doesn't affect our tests as we remove the namespaces before comparing. Viewing the parsed xml before XMLUtils.removeAttributes in TDMLRunner's verifyParserTestData (around line 1032) will show the invalid namespace.

For an example, see test defaultNamespaceInExpression2 in:
daffodil-test/src/test/resources/edu/illinois/ncsa/daffodil/section06/namespaces/namespaces.tdml
daffodil-test/src/test/scala/edu/illinois/ncsa/daffodil/section06/namespaces/TestNamespaces.scala