code: def get_asset_content_form_for_update(self, asset_content_id):
          
          # Implemented from template for
          # osid.repository.AssetAdminSession.get_asset_content_form_for_update_template
          from dlkit.abstract_osid.id.primitives import Id as ABCId
          from .objects import AssetContentForm
          collection = JSONClientValidated('repository',
                                           collection='Asset',
                                           runtime=self._runtime)
          if not isinstance(asset_content_id, ABCId):
              raise errors.InvalidArgument('the argument is not a valid OSID Id')
          document = collection.find_one({'assetContents._id': ObjectId(asset_content_id.get_identifier())})
          for sub_doc in document['assetContents']:  # There may be a MongoDB shortcut for this
              if sub_doc['_id'] == ObjectId(asset_content_id.get_identifier()):
                  result = sub_doc
          obj_form = AssetContentForm(
              osid_object_map=result,
              runtime=self._runtime,
              proxy=self._proxy)
          obj_form._for_update = True
          self._forms[obj_form.get_id().get_identifier()] = not UPDATED
          return obj_form
docs: Gets the asset content form for updating an existing asset content.
  
          A new asset content form should be requested for each update
          transaction.
  
          arg:    asset_content_id (osid.id.Id): the ``Id`` of the
                  ``AssetContent``
          return: (osid.repository.AssetContentForm) - the asset content
                  form
          raise:  NotFound - ``asset_content_id`` is not found
          raise:  NullArgument - ``asset_content_id`` is ``null``
          raise:  OperationFailed - unable to complete request
          *compliance: mandatory -- This method must be implemented.*