docs: def value(self):
          """
          Normalise the Attribute value and return
          .. note: `datetime` objects are normalised to ISO datestring, `bool` objects are normalised to Yes or No
  
          :rtype: str
          :return: The normalised value
          """
          if isinstance(self.raw_value, (datetime.datetime, datetime.date)):
              return self.raw_value.isoformat()
          elif isinstance(self.raw_value, (bool,)):
              return 'Yes' if self.raw_value else 'No'
          return self.raw_value