[postgis-devel] POINT EMPTY in WKB

[Paragon Corporation]

Yah the answer is Paul is too lazy.

That's okay I don't forsee myself trying to create multipoints with empty
points.  I'm sure there is a use case, but I really don't want to know what
that is. 

That would dig up a whole can of worms like what is the intersection of a
multipoint composed of 2 empty points with a multilinestring with 2 empty
linestrings.



-----Original Message-----
From: postgis-devel-bounces at postgis.refractions.net
[mailto:postgis-devel-bounces at postgis.refractions.net] On Behalf Of Mark
Cave-Ayland
Sent: Tuesday, December 07, 2010 3:39 AM
To: PostGIS Development Discussion
Subject: Re: [postgis-devel] POINT EMPTY in WKB

Paul Ramsey wrote:

> It's legal and it's a whole category of empty shit I am not handling 
> correctly. I only recognize the case of
> 
> MULTIPOINT EMPTY
> 
> and MULTIPOINT (...stuff...) is assumed to be real stuff.
> 
> GEOMETRYCOLLECTION(POINT EMPTY, POINT EMPTY) will be picked up though.
> 
> Oy vey.
> 
> P.

I suspect that the answer to this can be found in the ISO spec WKT BNF
representation - or at least it should be ;)


ATB,

Mark.

-- 
Mark Cave-Ayland - Senior Technical Architect
PostgreSQL - PostGIS
Sirius Corporation plc - control through freedom
http://www.siriusit.co.uk
t: +44 870 608 0063

Sirius Labs: http://www.siriusit.co.uk/labs
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