Trk::TrackingVolumesSvc Node1 Trk::TrackingVolumesSvc - m_pDetStore - m_volumes - m_volumeNames + initialize() + finalize() + volume() + volumeName() + TrackingVolumesSvc() + ~TrackingVolumesSvc() Node2 extends< AthService, ITrackingVolumesSvc > Node2->Node1