MI How to calculate length of intersection polylines/regions ?

[Christoph Ebner von Eschenbach]

Sorry, if this is a frequently asked question, but I did not find an answer to this 
problem on MapInfo-L yet.

I have a table with lines/polylines, which intersects a table with region objects and 
I want to calculate the length of the intersection.

When I execute statements like
'Select Overlap(Polylines.obj, Regions.obj) from Polylines,Regions where Polylines.OBJ 
intersects Regions.OBJ Into NewTable', MapInfo selects the WHOLE length of these 
lines, which intersect regions. But since I'm only interested in the intersecting 
part, I cannot use the ObjectLen-Statement afterwards to get the intersecting length.

Any help would be very appreciated.
Christoph E.v.Eschenbach
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