SDK forms as a set of scripting interfaces that are published successively.
For aircraft there's a scripting interface (documented
here), that's the entry point for scripting the aircraft behavior. I know "data references" are X-plane terminology; since we are using JSBSim, you can access all JSBSim variables via the
jsb object from the script.
Some of the JSB variables are common and described in their reference manual, but many of them are specific for your aircraft, as defined in your JSBSim model file. So getting a universal list of data references is not that simple, though I guess some common naming convention is being used.
So basically, once you know the subtleties of how to model aircraft in JSBSim, you can control and animate it in the OT aircraft script easily.
But I really don't know enough about it yet, we are only using a minimum set and just what we need from it, it will require more documentation and tutorial effort if it has to be used for simulator.