Very helpful: Using the flag "-r" (v.in.ogr -r) will allow you to limit the 
import of a vector file to the current region.
You thus don't need to clip as postprocess but can do that directly when 
converting.

@strk: Do you know of projects/options to implement the grass topology inside 
PostGIS2.0?


>As I'm having to do with topology in PostGIS I'm very interested in the
>concept behind GRASS regions. It's interesting that you mention a resolution
>as I've been thinking for a while that a default resolution could be computed
>given an extent in that the maximum error double precision floating points can
>represent depend on the biggest absolute value one may ever want to use.
>An extent (region) would then give you these upper limits so to be possibly
>usable to compute a resolution.
>
>Is this anything close to what GRASS is using these regions for ?
>
>Yeah, I know this is probably not the right list to discuss this, but
>I'm hoping grass people are also here and can help in harmonizing topologies
>some more, on a neutral gameboard:)
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