[Bf-python] creating IPO

[info at blender3d.it]

Hi all,
Firts of all I'm sorry for my poor english

I'm working on a script using IPOs and I have a couple of questions:

1. It's correct to create a new ipocurve with statment:
        ipo = Ipo.New('Object', "name_of_ipo")
        ipo.addCurve('RotX')
this is working but is not documented in the API.

2. in the ipo window I can see dRotX and dLocX ipos
    but if I want to create a dRotX ipocurve I have to write
    addCurve(DRotX.....
    is this a bug?

3. Can please someone explain which is the difference between RotX and dRotX
or between LocX and dLocX


Thank for Your attention.

Ciao

        Paolo