@utilities.arguments_not_none<EOL><INDENT>def get_authorizations_for_agent_on_date(self, agent_id, from_, to):<DEDENT>
raise errors.Unimplemented()<EOL>
Gets an ``AuthorizationList`` for the given agent and effective during the entire given date range inclusive but not confined to the date range.

        arg:    agent_id (osid.id.Id): an agent ``Id``
        arg:    from (osid.calendaring.DateTime): starting date
        arg:    to (osid.calendaring.DateTime): ending date
        return: (osid.authorization.AuthorizationList) - the returned
                ``Authorization`` list
        raise:  InvalidArgument - ``from`` is greater than ``to``
        raise:  NullArgument - ``agent_id, from`` or ``to`` is ``null``
        raise:  OperationFailed - unable to complete request
        raise:  PermissionDenied - authorization failure occurred
        *compliance: mandatory -- This method must be implemented.*