[postgis-devel] Canonical Text Rep for empty Geometry Collections

[strk at refractions.net]

On Mon, Jan 17, 2005 at 12:49:36PM +0100, Markus Schaber wrote:
> Hi,
> 
> What is the correct Canonical Text Representation for empty Geometry
> Collections?

'GEOMETRYCOLLECTION EMPTY'

(actually '<anytype> EMPTY' works)


> With old PostGIS 0.8, the following worked:
> 
> logigis=#  select 'GEOMETRYCOLLECTION(EMPTY)'::geometry;
>              geometry
> -----------------------------------
>  SRID=-1;GEOMETRYCOLLECTION(EMPTY)
> (1 Zeile)
> 
> But with new PostGIS 1.0 CVS, it does not work any more:
> 
> lwgeom=# select 'GEOMETRYCOLLECTION(EMPTY)'::geometry;
> ERROR:  parse error - invalid geometry
> lwgeom=# select 'SRID=-1;GEOMETRYCOLLECTION(EMPTY)'::geometry;
> ERROR:  parse error - invalid geometry
> 
> This makes me believe that we currently cannot restore old dumps that
> contain empty collections.

Yes, this is an issue. I'll try at making the new parser
accept that as well.

--strk;

> 
> HTH,
> Markus



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