code: def delete_statement(cls, prop_nr):
          
          return cls(value='', snak_type='value', data_type='', is_reference=False, is_qualifier=False, references=[],
                     qualifiers=[], rank='', prop_nr=prop_nr, check_qualifier_equality=True)
docs: This serves as an alternative constructor for WDBaseDataType with the only purpose of holding a WD property
          number and an empty string value in order to indicate that the whole statement with this property number of a
          WD item should be deleted.
          :param prop_nr: A WD property number as string
          :return: An instance of WDBaseDataType