code: def process_post_tag(self, bulk_mode, api_tag):
          
          tag = None
  
          # try to get from the ref data map if in bulk mode
          if bulk_mode:
              tag = self.ref_data_map["tags"].get(api_tag["ID"])
  
          # double check the db before giving up, we may have sync'd it in a previous run
          if not tag:
              tag, created = Tag.objects.get_or_create(site_id=self.site_id,
                                                       wp_id=api_tag["ID"],
                                                       defaults=self.api_object_data("tag", api_tag))
              if tag and not created:
                  self.update_existing_tag(tag, api_tag)
  
              # add to ref data map so later lookups work
              if tag:
                  self.ref_data_map["tags"][api_tag["ID"]] = tag
  
          return tag
docs: Create or update a Tag related to a post.
  
          :param bulk_mode: If True, minimize db operations by bulk creating post objects
          :param api_tag: the API data for the Tag
          :return: the Tag object