[geos-devel] WKT EMPTY

[strk at refractions.net]

I agree, POINT EMPTY would be easier to implement, and already has
more implementations then just POINT.

--strk;

On Tue, Apr 19, 2005 at 02:19:28PM -0700, Martin Davis wrote:
> Can't resist adding my 2c worth...
> 
> To my mind, it's pretty clear that the intent of the syntax spec is that
> words in all UPPERCASE are intended to be literals in the WKT language.
> In this case, the representation of an empty Point is
> 
> POINT EMPTY
> 
> This interpretation also has the advantage of being unambiguous and
> explicit.  If the representation was POINT only, there are two
> interpretations:
> 
> - an empty Point
> - an incorrect Point representation, with the actual coordinate missing
> 
> I guess the spec authors may have the final word, but until they weigh
> in I'd vote for sticking with POINT EMPTY.
> 
> Martin Davis, Senior Technical Architect
> Vivid Solutions Inc.      www.vividsolutions.com
> Suite #1A-2328 Government Street Victoria, B.C. V8T 5G5
> Phone: (250) 385 6040 - Local 308 Fax: (250) 385 6046
> 
> 
> > -----Original Message-----
> > From: geos-devel-bounces at geos.refractions.net 
> > [mailto:geos-devel-bounces at geos.refractions.net] On Behalf Of 
> > Frank Warmerdam
> > Sent: April 19, 2005 1:58 PM
> > To: GEOS Development List
> > Subject: [geos-devel] WKT EMPTY
> > 
> > 
> > Folks,
> > 
> > David Arctur is uncertain about the WKT EMPTY issue himself, so at 
> > this point we have no clear answer on what is right or wrong. 
> >  He has agreed that this point should be clarified in future 
> > versions of the 
> > simple features spec by the revision working group. 
> > 
> > But that doesn't help us here and now. 
> > 
> > PS. Forgive me for changing the subject - I think the GEOS 
> > Exceptions subject line was getting a little to general-purpose. 
> > 
> > Best regards,
> > -- 
> > ---------------------------------------+----------------------
> ----------
> > ---------------------------------------+------
> > I set the clouds in motion - turn up   | Frank Warmerdam, 
> > warmerdam at pobox.com
> > light and sound - activate the windows | http://pobox.com/~warmerdam
> > and watch the world go round - Rush    | Geospatial 
> > Programmer for Rent
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> > 
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