InDet::SiLayerBuilder Node1 InDet::SiLayerBuilder + SiLayerBuilder() + ~SiLayerBuilder() + initialize() + cylindricalLayers() + discLayers() + planarLayers() + identification() - createDiscLayers() - createRingLayers() Node2 extends< SiLayerBuilderImpl, Trk::ILayerBuilder > Node2->Node1