def __part_type(self, part, input):
        """
        Get a I{parameter definition} (pdef) defined for a given body or header
        message part.

        An input I{pdef} is a (I{name}, L{xsd.sxbase.SchemaObject}) tuple,
        while an output I{pdef} is a L{xsd.sxbase.SchemaObject}.

        @param part: A service method input or output part.
        @type part: I{suds.wsdl.Part}
        @param input: Defines input/output message.
        @type input: boolean
        @return:  A list of parameter definitions
        @rtype: [I{pdef},...]

        """
        if part.element is None:
            query = TypeQuery(part.type)
        else:
            query = ElementQuery(part.element)
        part_type = query.execute(self.schema())
        if part_type is None:
            raise TypeNotFound(query.ref)
        if part.type is not None:
            part_type = PartElement(part.name, part_type)
        if not input:
            return part_type
        if part_type.name is None:
            return part.name, part_type
        return part_type.name, part_type
Get a I{parameter definition} (pdef) defined for a given body or header
        message part.

        An input I{pdef} is a (I{name}, L{xsd.sxbase.SchemaObject}) tuple,
        while an output I{pdef} is a L{xsd.sxbase.SchemaObject}.

        @param part: A service method input or output part.
        @type part: I{suds.wsdl.Part}
        @param input: Defines input/output message.
        @type input: boolean
        @return:  A list of parameter definitions
        @rtype: [I{pdef},...]