Runs the test case.
Document doc;
DocumentType docType;
NamedNodeMap notations;
Node notationNode;
String notationValue;
doc = (Document) load("staff", false);
docType = doc.getDoctype();
assertNotNull("docTypeNotNull", docType);
notations = docType.getNotations();
assertNotNull("notationsNotNull", notations);
notationNode = notations.getNamedItem("notation1");
assertNotNull("notationNotNull", notationNode);
notationValue = notationNode.getNodeValue();
assertNull("nodeValue", notationValue);