[postgis-devel] GML for empty geometries ?

[Paul Ramsey]

On Wed, Dec 14, 2011 at 10:47 AM, Sandro Santilli <strk at keybit.net> wrote:
> On Wed, Dec 14, 2011 at 09:18:09AM -0800, Paul Ramsey wrote:
>> On Wed, Dec 14, 2011 at 8:37 AM, Sandro Santilli <strk at keybit.net> wrote:
>> >
>> > I'm not fond of XML Schemas so don't really know what I'm talking about.
>> > Is 'POINT EMPTY' legal WKT ?
>>
>> Based on 30 seconds of research I'd say go with NULL as the return for
>> empty geometries.
>> Yes, 'POINT EMPTY' (and all the other typological variants) is legal
>> in WKT. (But the concept of EMPTY appears completely ignored in all
>> discussions of WKB.) (Standards rule.)
>
> It strikes me that a valid entity can't be represented in all formats
> published by the same authority.
>
> I filed a ticket to revert the work I did on making nice empty
> GML geoms: http://trac.osgeo.org/postgis/ticket/1377 even if I'd
> prefer to invent our own and bend ST_GeomFromGML into supporting
> them :)

Yeah, we really can't do that, the GML will be validated against the
external schemas too often for us to bend the rules.

>
> --strk;
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