BSplineCurves, Surfaces and Arcs

Hi all !

1. Does anyone know an excellent way to calculate the arc-length of a BSplineCurve and of a part of a BSplineCurve ?

2.How can one connect a dynamic number of BSplineCurves to one (let us say) object, that is compatible (inheritance tree) with a TopoDS_Shape object ? Is there something, that could be recommended ?

3. How can one create one (!) complete BSplineSurface out of all that BSplineCurves then ?

Any hints are warmly welcomed !

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