@abc.abstractmethod<EOL><INDENT>def get_agent_query(self, match):<DEDENT>
return<EOL>
Gets the agent query.

        :param match: ``true`` if a positive match, ``false`` for a negative match
        :type match: ``boolean``
        :return: the ``AgentQuery``
        :rtype: ``osid.authentication.AgentQuery``
        :raise: ``Unimplemented`` -- ``supports_agent_query()`` is ``false``

        *compliance: optional -- This method must be implemented if
        ``supports_agent_query()`` is ``true``.*