def multi_occurrence(self):
        """
        Get whether the node has multiple occurrences, i.e. is a I{collection}.

        @return: True if it has, False if it has at most 1 occurrence.
        @rtype: boolean

        """
        max = self.max
        if max is None:
            return False
        if max.isdigit():
            return int(max) > 1
        return max == "unbounded"