WFS server must support XPath expressions for referencing XML elements and attributes

[nsavard]

The "gml:" in "gml:description" in the sql request generated by a getfeature request, caused a Postgis error.

The request is:

http://gw.mapgears.com:8500/cgi-bin/mswfs110_ogc_cite?&service=WFS&version=1.1.0&request=GetFeature&typename=sf:PrimitiveGeoFeature&namespace=xmlns(sf=http://cite.opengeospatial.org/gmlsf)&filter=<ogc:Filter%20xmlns:gml="http://www.opengis.net/gml"%20xmlns:ogc="http://www.opengis.net/ogc"><ogc:PropertyIsEqualTo><ogc:PropertyName>//gml:description</ogc:PropertyName><ogc:Literal>description-f008</ogc:Literal></ogc:PropertyIsEqualTo></ogc:Filter>

The error is:

msWFSGetFeature(): WFS server error. FLTApplyFilterToLayer() failed
msPostGISLayerWhichShapes(): Query error. Error (ERROR:  syntax error at or near ":"
LINE 1: ...,500575 500000,500000 500000))',4326) and ( (//gml:descripti...
                                                             ^
) executing query: select "description","name","intProperty","uriProperty","measurand","dateTimeProperty","dateProperty","decimalProperty","id",encode(AsBinary(force_collection(force_2d("the_geom")),'NDR'),'hex') as geom,"id" from primitivegeofeature where the_geom && GeomFromText('POLYGON((500000 500000,500000 500075,500575 500075,500575 500000,500000 500000))',4326) and ( (//gml:description= 'description-f008') )
msSaveMap(): Unable to access file. (/tmp/ms_tmp/4b730556_1dab_0._filter.map)
msEvalRegex(): Regular expression error. String failed expression test.

[nsavard]

Notice that the error is caused by XPath expressions not beeing supported in a WFS server.

[assefa]

fix committed in r9792. We should not get the postgres error. Not sure yet if that is enough to pass the test (cite test is down right now and could not check it).

[nsavard]

RE #comment:2 I'm not a programmer but I checked the revision, it seems to only strip the namespace. It doesn't seem to fix the xpath expressions. Isn't it?

[assefa]

Norm, you are right. Only the strip on namespaces is done. Not sure yet how to address yet xpath expression.