@abc.abstractmethod<EOL><INDENT>def get_authorizations_by_query(self, authorization_query):<DEDENT>
return<EOL>
Gets a list of ``Authorizations`` matching the given query.

        :param authorization_query: the authorization query
        :type authorization_query: ``osid.authorization.AuthorizationQuery``
        :return: the returned ``AuthorizationList``
        :rtype: ``osid.authorization.AuthorizationList``
        :raise: ``NullArgument`` -- ``authorization_query`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure
        :raise: ``Unsupported`` -- ``authorization_query`` is not of this service

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