code: def handleEntity(self, entity):
          
          if entity is None: entity__o = None
          else: entity__o = entity._o
          libxml2mod.xmlHandleEntity(self._o, entity__o)
docs: Default handling of defined entities, when should we define
            a new input stream ? When do we just handle that as a set
             of chars ?  OBSOLETE: to be removed at some point.