[postgis-devel] POINT EMPTY in WKB

[Paul Ramsey]

It's just POINT EMPTY. Everything else has a representation. In fact,
I think Mats checked for me and SQLServer uses the same semantic as I
am for empties in WKB, npoints=0 or ngeoms=0 or nrings=0 depending on
the type being represented.

And I think for POINT EMPTY they transform to GEOMETRYCOLLECTION
EMPTY. (which is what we do now, see

  SELECT AsText('POINT EMPTY'::geometry);

P.

On Mon, Dec 6, 2010 at 12:48 PM, Paragon Corporation <lr at pcorp.us> wrote:
>
>
>> A final possibility would be to hack POINT EMPTY into WKB, as
>> something like POINT(nan nan nan) or POINT(inf inf inf) or POINT(-0 -0
>> -0). There would be a danger there in platforms that have different
>> interpretations of what nan, inf or -0 are in binary.
>
> I the only issue with POINT EMPTY or ..anyspecifictype EMPTY
>
> I'm a bit bothered about the dump issue you describe -- not being able to
> restore exactly what you thought you had.
>
> Thanks,
> Regina
>
>
>
> _______________________________________________
> postgis-devel mailing list
> postgis-devel at postgis.refractions.net
> http://postgis.refractions.net/mailman/listinfo/postgis-devel
>