code: def source(self, format='xml', accessible=False):
          
          if accessible:
              return self.http.get('/wda/accessibleSource').value
          return self.http.get('source?format='+format).value
docs: Args:
              format (str): only 'xml' and 'json' source types are supported
              accessible (bool): when set to true, format is always 'json'