docs: def json_schema_validation_format(value, schema_validation_type):
      """
      adds iso8601 to the datetimevalidator
      raises SchemaError if validation fails
      """
      DEFAULT_FORMAT_VALIDATORS['date-time'] = validate_format_iso8601
      DEFAULT_FORMAT_VALIDATORS['text'] = validate_format_text
      validictory.validate(value, schema_validation_type, format_validators=DEFAULT_FORMAT_VALIDATORS)