Trk::IExtrapolationEngine Node1 Trk::IExtrapolationEngine + ~IExtrapolationEngine() + extrapolate() + extrapolate() + geometryType() + interfaceID() Node2 IAlgTool Node2->Node1 Node3 std::string Node3->Node1 #m_sopPrefix #m_sopPostfix Node4 std::basic_string< char > Node4->Node3