Runs the test case.
Document doc;
DocumentType docType;
NamedNodeMap entities;
Node entityNode;
NamedNodeMap attrList;
doc = (Document) load("staff", false);
docType = doc.getDoctype();
assertNotNull("docTypeNotNull", docType);
entities = docType.getEntities();
assertNotNull("entitiesNotNull", entities);
entityNode = entities.getNamedItem("ent1");
assertNotNull("ent1NotNull", entityNode);
attrList = entityNode.getAttributes();
assertNull("entityAttributesNull", attrList);