@abc.abstractmethod<EOL><INDENT>def supports_calendar_time_types(self, calendar_type, time_type):<DEDENT>
return<EOL>
Tests if a given calendar and time type are used together in a ``DateTime``.

        :param calendar_type: the type of the calendar
        :type calendar_type: ``osid.type.Type``
        :param time_type: the type of the time system
        :type time_type: ``osid.type.Type``
        :return: ``true`` if the given calendar and time types are supported, ``false`` otherwise
        :rtype: ``boolean``
        :raise: ``NullArgument`` -- ``calendar_type`` or ``time_type`` is ``null``

        *compliance: mandatory -- This method must be implemented.*