docs: def delete_item(self, item_uri):
          """Delete an item from a collection
  
          :param item_uri: the URI that references the item
          :type item_uri: String
  
          :rtype: String
          :returns: a message confirming that the metadata is modified
  
          :raises: APIError if the request was not successful
          """
  
          response = self.api_request(item_uri, method='DELETE')
          return self.__check_success(response)