Howto:Work with the Property Tree API
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Most FlightGear systems communicate internally using the so called Property Tree (see Property Tree Intro for an introduction).
This article is meant to introduce you to the C++ API that is used by FlightGear to work with the Property Tree.
Most of the high level API can be found in the $FG_SRC/Main folder, specifically the files fg_props.cxx and the corresponding fg_props.hxx header are relevant. The property tree implementation itself is to be found in the SimGear sources ([1] see specifically SGPropertyNode).