Re: [Geoserver-users] Questions about Filter Namespace Qualifiers for XML WFS Requests

[Justin D. <jde...@op...>]

Hi,

Can you include the full XML document you are sending for the request. Also
can you replicate the problem against any layer, say one of the layers that
ships with GeoServer?

Thanks.

-Justin

On Tue, Nov 2, 2010 at 4:00 PM, phony baloney <pho...@gm...>wrote:

> Hi all,
>
> First time writer/subscriber to the list.
>
> I've been experimenting with POST'd XML WFS requests in GeoServer 2.02
> recently and have observed some strange results. Basically, according to my
> understanding of the OGC WFS and filter specifications, in a valid WFS
> request sent via XML, every XML element is supposed to be properly
> namespace-qualified, e.g. something like:
>
> (namespace prefixes/URI's are appropriately defined earlier in the WFS
> request)
>
> <ogc:Filter>
>    <ogc:PropertyIsBetween>
>       <ogc:PropertyName>foo:bar</ogc:PropertyName>
>       <ogc:LowerBoundary><ogc:Literal>2</ogc:Literal></ogc:LowerBoundary>
>       <ogc:UpperBoundary><ogc:Literal>4</ogc:Literal></ogc:UpperBoundary>
>    </ogc:PropertyIsBetween>
> </ogc:Filter>
>
> However, when I issue the above request to GeoServer 2.02, it will
> encounter a ClassCastException when it tries to perform an unguarded cast
> from the "property name" String object to an OpenGIS filter Expression
> interface object. If I instead try to replicate the behavior of the
> PropertyIsBetween filter by using a PropertyIsLessThan AND'd with a
> PropertyIsGreaterThan filter, then I no longer get the exception, but I get
> 0 features in the feature collection I get back (and yes, I've confirmed
> that it should be getting results back). If I take out either one of the
> comparisons in the latter case (i.e. either the PropertyIsLessThan or the
> PropertyIsGreaterThan), then I start getting an error message back from the
> database because it tries to pass one of the numeric literals as an SQL
> string literal in single quotes.
>
>
> I had come across a similar issue when specifying filters using KVP over
> HTTP GET requests before. My fix/workaround/hack/whatever in that case was
> that if I removed the namespace qualifiers from all of the filter tags,
> things would work just fine. E.g. using something like:
>
> <Filter>
>    <PropertyIsBetween>
>       <PropertyName>foo:bar</PropertyName>
>       <LowerBoundary><Literal>2</Literal></LowerBoundary>
>       <UpperBoundary><Literal>4</Literal></UpperBoundary>
>    </PropertyIsBetween>
> </Filter>
>
> instead would work fine. It appears that this is also the case with XML
> requests, as stripping off the namespace qualifiers on the filter
> expressions fixes the problem and you get the correct results back
> afterward. Is this a known issue, or am I missing something, or am I just
> misreading/misinterpreting the OGC standards? Also, is it possible that I
> don't have my GeoServer properly configured? Is this a side effect of moving
> away from/deprecating the GeoTools filter classes in favor of the OpenGIS
> filter interfaces?
>
> (As a slight aside, I have no clue where your guys' implementation classes
> for those interfaces are hiding, or whether they're being provided by
> another library)
>
> As a final note, I have also tried enabling the "strict CITE compliance"
> option on the WFS service and have used the GeoServer-specific "strict=true"
> on the client end when submitting my WFS requests, but neither seems to make
> any difference over whether the filter expression is accepted with namespace
> qualifiers. Any info on this would be greatly appreciated.
>
>
> Thanks!
> Phony
>
>
>
> ------------------------------------------------------------------------------
> Nokia and AT&T present the 2010 Calling All Innovators-North America
> contest
> Create new apps & games for the Nokia N8 for consumers in  U.S. and Canada
> $10 million total in prizes - $4M cash, 500 devices, nearly $6M in
> marketing
> Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store
> http://p.sf.net/sfu/nokia-dev2dev
> _______________________________________________
> Geoserver-users mailing list
> Geo...@li...
> https://lists.sourceforge.net/lists/listinfo/geoserver-users
>
>


-- 
Justin Deoliveira
OpenGeo - http://opengeo.org
Enterprise support for open source geospatial.