@Test
public void testInternalOccurrence() throws IOException, SchemaSyntaxException {

  OSLSchema schema = (OSLSchema) readSchema("in", "intocc.xml");
  TopicIF type = makeType("#something");
  TopicIF instance = builder.makeTopic();
  instance.addType(type);
  TopicIF occtype = makeType("#occtype");
  OccurrenceIF occ = builder.makeOccurrence(instance, occtype, getRelative("http://www.ontopia.net/"));
  validate(schema, instance, occ);
}