docs: def _get_tag_query_tag(self, sampler, wmi_obj, tag_query):
          """
          Design a query based on the given WMIObject to extract a tag.
  
          Returns: tag or TagQueryUniquenessFailure exception.
          """
          self.log.debug(
              u"`tag_queries` parameter found."
              " wmi_object={wmi_obj} - query={tag_query}".format(wmi_obj=wmi_obj, tag_query=tag_query)
          )
  
          # Extract query information
          target_class, target_property, filters = self._format_tag_query(sampler, wmi_obj, tag_query)
  
          # Create a specific sampler
          tag_query_sampler = WMISampler(self.log, target_class, [target_property], filters=filters, **sampler.connection)
  
          tag_query_sampler.sample()
  
          # Extract tag
          self._raise_on_invalid_tag_query_result(tag_query_sampler, wmi_obj, tag_query)
  
          link_value = str(tag_query_sampler[0][target_property]).lower()
  
          tag = "{tag_name}:{tag_value}".format(tag_name=target_property.lower(), tag_value="_".join(link_value.split()))
  
          self.log.debug(u"Extracted `tag_queries` tag: '{tag}'".format(tag=tag))
          return tag