[postgis-devel] WKT form(s) of MULTIPOINT

[Mateusz Loskot]

Thanks for digging this out Paul.

"Everyone follows the example!" is actually the answer
I was looking for on ":)

M

On 4 December 2013 15:52, Paul Ramsey <pramsey at cleverelephant.ca> wrote:
> Not the first to notice this, though apparently it's rare enough to
> only be found spottily.
>
> http://lists.osgeo.org/pipermail/postgis-devel/2011-February/011759.html
>
> The fact that the postgis form is in other places (openlayers) makes
> things harder yet.
>
> And the root cause raises his voice here,
> http://lists.osgeo.org/pipermail/postgis-users/2003-September/003168.html
>
> P
>
>
> On Wed, Dec 4, 2013 at 7:44 AM, Paul Ramsey <pramsey at cleverelephant.ca> wrote:
>> Well, that's embarrassing. We don't implement either spec, we follow
>> SQL/MM, but it has the same BNF as the above. We got the initial
>> sparser representation at the dawn of time, and I guess never changed
>> it. I would have thought it would happen at 2.0 when the wkt emitter
>> was re-written, but apparently I missed it (unless the archives show I
>> did it on purpose)
>>
>> P.
>>
>> On Wed, Dec 4, 2013 at 7:31 AM, Mateusz Loskot <mateusz at loskot.net> wrote:
>>> Hi,
>>>
>>> Yet another curiosity from the OGC vs PostGIS ring.
>>> Given the WKT BNF grammars specified in the two versions of OGC SFS:
>>>
>>> 1) OGC 05-126 Version: 1.1.0
>>>
>>> <MultiPoint Tagged Text> := MULTIPOINT <Multipoint Text>
>>> <Multipoint Text> := EMPTY | ( <Point Text > {, <Point Text > }* )
>>> <Point Text> := EMPTY | ( <Point> )
>>> <Point> := <x> <y>
>>>
>>> 2) OGC 06-103 Version: 1.2.[0-1]
>>>
>>> <multipoint tagged text> ::= multipoint <multipoint text>
>>> <multipoint text> ::= <empty set>
>>>         | <left paren> <point text> {<comma> <point text>}* <right paren>
>>> <point text> ::= <empty set> | <left paren> <point> <right paren>
>>> <point> ::= <x> <y>
>>>
>>> Why PostGIS documentation shows MULTIPOINT(0 0,1 2)
>>> as example in "OpenGIS WKB and WKT"?
>>> (PostGIS can parse the degenerate form as well.)
>>>
>>> BTW, Wikipedia [1] also shows the same form (after PostGIS?):
>>> http://en.wikipedia.org/wiki/Well-known_text
>>>
>>> I sense, this is due to *incorrect* example presented in 6.2.3 section
>>> of the OGC 05-126 Version: 1.1.0,
>>> where ‘MULTIPOINT (10 10, 20 20)’ is presented.
>>>
>>> Which version of OGC SF does PostGIS implement here?
>>>
>>> Best regards,
>>> --
>>> Mateusz  Łoskot, http://mateusz.loskot.net
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-- 
Mateusz  Łoskot, http://mateusz.loskot.net