code: def delete_objective(self, objective_id):
          
          # Implemented from template for
          # osid.learning.ObjectiveAdminSession.delete_objective_template
  
          if not isinstance(objective_id, ABCId):
              raise errors.InvalidArgument('the argument is not a valid OSID Id')
          collection = JSONClientValidated('learning',
                                           collection='Activity',
                                           runtime=self._runtime)
          if collection.find({'objectiveId': str(objective_id)}).count() != 0:
              raise errors.IllegalState('there are still Activitys associated with this Objective')
  
          collection = JSONClientValidated('learning',
                                           collection='Objective',
                                           runtime=self._runtime)
          collection.delete_one({'_id': ObjectId(objective_id.get_identifier())})
docs: Deletes the ``Objective`` identified by the given ``Id``.
  
          arg:    objective_id (osid.id.Id): the ``Id`` of the
                  ``Objective`` to delete
          raise:  NotFound - an ``Objective`` was not found identified by
                  the given ``Id``
          raise:  NullArgument - ``objective_id`` is ``null``
          raise:  OperationFailed - unable to complete request
          raise:  PermissionDenied - authorization failure
          *compliance: mandatory -- This method must be implemented.*