@abc.abstractmethod<EOL><INDENT>def is_equivalent(self, type_, equivalent_type):<DEDENT>
return<EOL>
Tests if the given types are equivalent.

        :param type: a type
        :type type: ``osid.type.Type``
        :param equivalent_type: another type
        :type equivalent_type: ``osid.type.Type``
        :return: ``true`` if both types are equivalent, ``false`` otherwise
        :rtype: ``boolean``
        :raise: ``NullArgument`` -- ``type`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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