[OpenLayers-Users] question about OpenLayers.Format.GML.v2

[Arnd Wippermann]

I would also like to request different feature types from one WFS server
into on vector layer. 

Today I use this behaviour to add one layer to my application and can
afterwards decide, which typenames to request from the server. I haven't to
add three separate layers.

I do not use grouping in the mapfile, instead i change with mergeNewParams
the typename parameter for the request.

A simple example shows this:

http://gis.ibbeck.de/ginfo/apps/OLExamples/OL26/examples/styles_unique_with_
group_wfs.html

Arnd Wippermann


-----Ursprüngliche Nachricht-----
Von: users-bounces at openlayers.org [mailto:users-bounces at openlayers.org] Im
Auftrag von Tim Schaub
Gesendet: Donnerstag, 6. November 2008 18:59
Cc: users at openlayers.org
Betreff: Re: [OpenLayers-Users] question about OpenLayers.Format.GML.v2

Hey-

bartvde at osgis.nl wrote:
> Hi list,
> 
> the constructor of the new GML2 parser gets a featureType parameter.
> 
> Does this mean that if a GML file contains multiple featureTypes, that 
> I have to call read multiple times, and append the results myself? 
> Will this be as efficient as doing the parsing in a single round?

Yeah, this is because up until this point, vector formats have been used to
read/write collections of features, and I think of collections of features
as layers.

I'd like to continue thinking that way (because I think it works).  But I
know there are people who are interested in making WFS requests for multiple
feature types (which I like to think of as layers).

I really want to get WFS working for the most common cases.  And I want it
to be solid (with good support for transactions and filtered queries).  I've
made a boatload of changes in the topp/wfs sandbox - including changes to
the GML & Filter code.

My spare energy will be focussed on getting this code (the WFS protocol and
related GML & Filter changes) in to the trunk.  Modifying the existing GML
code is a bit at odds with that.

I also know that it will make sense to have the protocol be used in the
absence of a layer.  And of course we want to support our OGC protocol power
user(s).

Bart, can you describe (perhaps again) where you want to make a single
request for multiple feature types.  I'm sure it is done all the time, I
just usually see a way that I think it simpler, so I'm curious to hear more
use cases.

Tim


> 
> Best regards,
> Bart
> 
> _______________________________________________
> Users mailing list
> Users at openlayers.org
> http://openlayers.org/mailman/listinfo/users


--
Tim Schaub
OpenGeo - http://opengeo.org
Expert service straight from the developers.
_______________________________________________
Users mailing list
Users at openlayers.org
http://openlayers.org/mailman/listinfo/users