C3D - XML Variables for Legal Descriptions

Anyone know what the variable is to get a radial bearing? {curveStartDirection} gives me the bearing in from the radius point, but I can't find its opposite (I'm assuming it is there somewhere).

Also, does anyone have a list of what all the variables are and what they do?

I've monkeyed around with the legal description writer in C3D (xml) for years, but haven't ever seen a full list of everything I can list with it, which would be tremendously helpful.

Thanks,

Paul