docs: def create_answer(self, answer_form):
          """Creates a new ``Answer``.
  
          arg:    answer_form (osid.assessment.AnswerForm): the form for
                  this ``Answer``
          return: (osid.assessment.Answer) - the new ``Answer``
          raise:  IllegalState - ``answer_form`` already used in a create
                  transaction
          raise:  InvalidArgument - one or more of the form elements is
                  invalid
          raise:  NullArgument - ``answer_form`` is ``null``
          raise:  OperationFailed - unable to complete request
          raise:  PermissionDenied - authorization failure occurred
          raise:  Unsupported - ``answer_form`` did not originate from
                  ``get_answer_form_for_create()``
          *compliance: mandatory -- This method must be implemented.*
  
          """
          # Implemented from template for
          # osid.repository.AssetAdminSession.create_asset_content_template
          from dlkit.abstract_osid.assessment.objects import AnswerForm as ABCAnswerForm
          collection = JSONClientValidated('assessment',
                                           collection='Item',
                                           runtime=self._runtime)
          if not isinstance(answer_form, ABCAnswerForm):
              raise errors.InvalidArgument('argument type is not an AnswerForm')
          if answer_form.is_for_update():
              raise errors.InvalidArgument('the AnswerForm is for update only, not create')
          try:
              if self._forms[answer_form.get_id().get_identifier()] == CREATED:
                  raise errors.IllegalState('answer_form already used in a create transaction')
          except KeyError:
              raise errors.Unsupported('answer_form did not originate from this session')
          if not answer_form.is_valid():
              raise errors.InvalidArgument('one or more of the form elements is invalid')
          answer_form._my_map['_id'] = ObjectId()
          item_id = Id(answer_form._my_map['itemId']).get_identifier()
          item = collection.find_one(
              {'$and': [{'_id': ObjectId(item_id)},
                        {'assigned' + self._catalog_name + 'Ids': {'$in': [str(self._catalog_id)]}}]})
          item['answers'].append(answer_form._my_map)
          result = collection.save(item)
  
          self._forms[answer_form.get_id().get_identifier()] = CREATED
          from .objects import Answer
          return Answer(
              osid_object_map=answer_form._my_map,
              runtime=self._runtime,
              proxy=self._proxy)