Runs the test case.
Document doc;
DocumentType docType;
NamedNodeMap notations;
Notation notation;
String nullNS = null;
doc = (Document) load("staffNS", false);
docType = doc.getDoctype();
notations = docType.getNotations();
assertNotNull("notationsNotNull", notations);
notation = (Notation) notations.getNamedItemNS(nullNS, "notation1");
assertNull("notationNull", notation);