VP1ExtraInputSystem::Clockwork Node1 VP1ExtraInputSystem ::Clockwork + root + visibilitySwitch + lightModel + material + pickStyle + ui + lastInputDir + inputFile() Node2 std::map< std::string, SoSeparator * > + elements Node2->Node1 +fileMap Node3 std::string Node3->Node2 +keys Node4 std::basic_string< char > Node4->Node3