- Member gazebo::physics::Joint::GetForce  (unsigned int _index)
- : not yet implemented. Get external forces applied at this Joint. Note that the unit of force should be consistent with the rest of the simulation scales.  
- Member gazebo::sensors::CameraSensor::GetTopic  () const 
- to be implemented  
- Class gazebo::SystemPlugin  
- how to make doxygen reference to the file gazebo.cc::g_plugins?