@utilities.arguments_not_none<EOL><INDENT>def get_child_objectives(self, objective_id):<DEDENT>
<EOL>if self._hierarchy_session.has_children(objective_id):<EOL><INDENT>child_ids = self._hierarchy_session.get_children(objective_id)<EOL>collection = JSONClientValidated('<STR_LIT>',<EOL>collection='<STR_LIT>',<EOL>runtime=self._runtime)<EOL>result = collection.find(<EOL>dict({'<STR_LIT>': {'<STR_LIT>': [ObjectId(child_id.get_identifier()) for child_id in child_ids]}},<EOL>**self._view_filter()))<EOL>return objects.ObjectiveList(<EOL>result,<EOL>runtime=self._runtime,<EOL>proxy=self._proxy)<EOL><DEDENT>raise errors.IllegalState('<STR_LIT>')<EOL>
Gets the children of the given objective.

        arg:    objective_id (osid.id.Id): the ``Id`` to query
        return: (osid.learning.ObjectiveList) - the children of the
                objective
        raise:  NotFound - ``objective_id`` is not found
        raise:  NullArgument - ``objective_id`` is ``null``
        raise:  OperationFailed - unable to complete request
        raise:  PermissionDenied - authorization failure
        *compliance: mandatory -- This method must be implemented.*