[OpenLayers-Users] KML beomg standardized?

[Chris Holmes]

Jon Blower wrote:
>  > where did you get the OGC / Google Cooperative effort?
> It was announced recently - can't remember where now but a Google search 
> on KML and OGC should produce results.

Yes, the main Google guys attended the last OGC meeting.

> 
>>  They need to ditch there own schema concept and go with a standard xml
>>  schema...
> It's my understanding that they will release a schema in due course (I 
> don't think there's a KML schema at all at the moment is there?).
There have been a few unofficial schemas floating around.


>  A 
> schema would definitely be useful for developers, provided it's properly 
> constructed.  The GML schema is very complex and, because it's 
> aggregated other documents, you can't easily do things like 
> automatically create Java classes from it (as far as I know) - so its 
> practical use for tooling is a bit limited.
With Simple Features for GML you finally can 
http://portal.opengeospatial.org/files/?artifact_id=15201 / 
http://schemas.opengis.net/gml/3.1.1/profiles/gmlsfProfile/1.0.0/ They 
should have released it when they put out gml 3.1.1 in the first place.

Note that implementing _reading_ KML with all the styling, is actually 
quite difficult.  I've talked to people who have had to do it and it's 
definitely tricky.  Partially because there is no schema, so you have to 
parse most any order.

But just reading the geometries is pretty easy - though it should be 
noted that geometries are based almost completely on GML 2.1.2

Producing KML is easy, since you can put it in any which order.

Chris

> 
>  > Speaking only for myself, I'm much more likely to support KML than any
>  > other XML geographic format.  I am wholly in favor of supporting KML in
>  > OpenLayers, regardless of what Google does with it from here on out.
>  > It's well-understood, it's simple, and it works.
> I agree!  It would be a disaster if KML became much more complicated - 
> there are so many datasets popping up in KML because it's simple.  BTW, 
> I've heard talk of KML "profiles": for example, certain KML constructs 
> are meaningless in a 2-D environment like Google Maps and OpenLayers, so 
> there might be a profile for 2-D apps that misses some features out.  
> I'm not sure whether (and when) this would happen though.
> 
> Regards,
> Jon
> 
> On 1/19/07, *Christopher Schmidt* <crschmidt at metacarta.com 
> <mailto:crschmidt at metacarta.com>> wrote:
> 
>     On Thu, Jan 18, 2007 at 06:08:12PM -0600, Lance Dyas wrote:
>      > Jon Blower wrote:
>      > >
>      > >
>      > > I would strongly support the idea of supporting KML in OpenLayers,
>      > > particularly now that Google are standardising KML through OGC.
>      > They need to ditch there own schema concept and go with a
>     standard xml
>      > schema...
> 
>     Speaking only for myself, I'm much more likely to support KML than any
>     other XML geographic format.  I am wholly in favor of supporting KML in
>     OpenLayers, regardless of what Google does with it from here on out.
>     It's well-understood, it's simple, and it works.
> 
>     Regards,
>     --
>     Christopher Schmidt
>     MetaCarta
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> 
> 
> 
> -- 
> --------------------------------------------------------------
> Dr Jon Blower              Tel: +44 118 378 5213 (direct line)
> Technical Director         Tel: +44 118 378 8741 (ESSC)
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-- 
Chris Holmes
The Open Planning Project
http://topp.openplans.org
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