// - walk over all way-versions
 //   - walk over all bboxes
 //     - if the way-id is recorded in the bboxes way-trackers
 //       - send the way to the bboxes writer
 void way(const osmium::Way& way) {
     if (debug) {
         std::cerr << "cut_administrative way " << way.id() << " v" << way.version() << "\n";
     }
     for (const auto& extract : info->extracts) {
         if (extract->way_tracker.get(way.id())){
             for (const auto& node_ref : way.nodes()) {
                 if (!extract->node_tracker.get(node_ref.ref())) {
                     extract->node_tracker.set(node_ref.ref());
                 }
             }
         }
     }
 }