@abc.abstractmethod<EOL><INDENT>def apply_qualifier_query(self, qualifier_query):<DEDENT>
pass<EOL>
Applies a qualifier query to this vault.

        :param qualifier_query: the qualifier query
        :type qualifier_query: ``osid.authorization.QualifierQuery``
        :raise: ``NullArgument`` -- ``qualifier_query`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure occurred
        :raise: ``Unsupported`` -- ``qualifier_query`` not of this service

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