Return a list of all elements intended for these actor(s).

def GetMyHeaderElements(self, actorlist=None):
        '''Return a list of all elements intended for these actor(s).
        '''
        if actorlist is None:
            actorlist = [None, SOAP.ACTOR_NEXT]
        else:
            actorlist = list(actorlist) + [None, SOAP.ACTOR_NEXT]
        return [ E for E in self.header_elements
                if _find_actor(E) in actorlist ]