https://docs.ros.org/en/fuerte/api/rospack/html/classrospack__tinyxml_1_1TiXmlUnknown.html
rospack: rospack_tinyxml::TiXmlUnknown Class Reference
classreference
https://docs.panda3d.org/1.10/python/reference/panda3d.core.TiXmlUnknown
TiXmlUnknown — Panda3D Manual
manual