code: def get_identities(self, item):
          
  
          for rol in self.roles:
              if rol in item['data']:
                  user = self.get_sh_identity(item["data"][rol])
                  yield user
  
          if 'activity' in item["data"]:
              for event in item["data"]['activity']:
                  event_user = [{"__text__": event['Who']}]
                  user = self.get_sh_identity(event_user)
                  yield user
  
          if 'long_desc' in item["data"]:
              for comment in item["data"]['long_desc']:
                  user = self.get_sh_identity(comment['who'])
                  yield user
docs: Return the identities from an item