[GRASS-dev] v.external, ogr direct access, topology and pseudo-topology.... a bit confused

[G. Allegri]

> But even a simple overlay can give wrong results if the data is not
> topologically clean... I personally cherish the fact that GRASS doesn't make
> it easy to do things quick and dirty.

Probably we mean different things, or maybe I've msunderstood topology
in Grass. Spatial operators like Overlay generally leaverages on
topology graph structures (like in GEOS), but I suppsed that
pseudo-topology (as meant in Grass) would be enough to guarantee the
results. Isn't it?