public void testNillableNode() {
MappingDocument doc = FakeXMLMetadata.docWithExcluded();
MappingElement root = (MappingElement)doc.getRootNode();
Properties names = root.getNamespacesAsProperties();
assertFalse(names.containsKey("xsi"));//$NON-NLS-1$
HandleNillableVisitor.execute(doc);
names = root.getNamespacesAsProperties();
assertTrue(names.containsKey("xsi"));//$NON-NLS-1$