chromium/tools/traffic_annotation/scripts/test_data/test_grouping.xml

<groups>
  <group name="Group A">
  <sender name="Foobar Component">
    <annotation id="foobar_policy_fetcher"/>
    <annotation id="foobar_info_fetcher"/>
  </sender>
  <sender name="Fizzbuzz Component">
    <annotation id="fizzbuzz_handle_front_end_messages"/>
    <annotation id="fizzbuzz_hard_coded_data_source"/>
    <annotation id="fizzbuzz_http_handler"/>
  </sender>
  </group>
  <group name="Group B">
  <sender name="Widget Component">
    <annotation id="widget_grabber"/>
  </sender>
  </group>
  <group name="Unsorted">
    <sender name="Recently Added">
    </sender>
  </group>
</groups>