[GRASS5] Re: Vector format proposal

[Eric G. Miller]

On Tue, May 15, 2001 at 08:48:27AM +0200, Radim Blazek wrote:
> USER_ID is category in grass and AREA_ID is sequential number assigned
> during build process. Link to table may not be broken. Lib is written in this 
> way.

Okay,
   Forgive me if I'm being dense. But, how do you join an external table
to select area(s) with category "2" when there are also lines and points
with category "2".  Do we join all then filter out the lines and points?

So we have something like:

1 : 2
2 : 2
3 : 2