resultType=hits for WFS 1.1

[bartvde]

WFS 1.1. has a resultType parameter, which can have a value of hits. In that case it should the return the number of records the query returns.

[tomkralidis]

More info on this in  http://portal.opengeospatial.org/files/?artifact_id=8339, table 9b, and clause 9.3

So, when a GetFeature request is passed with resulttype=hits OR <GetFeature resultType="hits"...>, MapServer WFS 1.1.0 responds with just the root element, adding the numberOfHits and timeStamp attributes.

<wfs:FeatureCollection
  xsi:schemaLocation="http://www.ec.gc.ca/carts http://devgeo.cciw.ca/cgi-bin/mapserv/carts?SERVICE=WFS&VERSION=1.1.0&REQUEST=DescribeFeatureType&TYPENAME=cws&OUTPUTFORMAT=text/xml; subtype=gml/3.1.1  http://www.opengis.net/wfs http://schemas.opengis.net/wfs/1.1.0/wfs.xsd" numberOfFeatures="$n" timeStamp="$t">

Where $n is the hit count and $t is the timestamp in ISO8601 format

Bart: does this make sense?

[tomkralidis]

This has been committed in trunk in r8662 and updated in msautotest in r8663.

Notes:

• for WFS 1.1.0, the root element will now always have numberOfFeatures output. This is an optional attribute which can be used regardless of whether resultType is passed by the client. So this would be useful to output in either case
• if resultType = hits, then the root element only is output
• timeStamp is an optional attribute, so I opted not to output it

Bart: can you test and verify? We can backport to 5.4.1 if all works as expected.

[bartvde]

Hey Tom, this works fine for us on ArcSDE. Thanks.

[tomkralidis]

FYI update in trunk (r9110).

If maxFeatures is passed in the GetFeature request, then the response numberOfFeatures matches maxFeatures.

FYI I also added an ows:Constraint "DefaultMaxFeatures" in WFS Capabilities (SOS does this as well) if MAP.WEB.METADATA.wfs|ows_maxfeatures is set.

Thanks to Bart and  GeoServer-users for the heads up.