Comments on: WFS Feature paging … yes please

By: what_nick

what_nick — Thu, 03 May 2007 09:09:51 +0000

Though not a WFS, Flickr Geographic queries employ a similar paging strategy.

By: Chris Tweedie

Chris Tweedie — Thu, 26 Apr 2007 01:52:15 +0000

While the resultType=hits may solve the issue of the total number, i still prefer CSW in that it is only a single request/response.

With WFS1.1 afaik (correct me if im wrong Chris) … you need to submit 2 requests, the first to retrieve the number based on your filter, and then submit the actual, “real” request.

Conversely, with CSW … all the useful info is contained in the header. This IMO, is the way it should be done if you are considering revisions …

SearchResults elementSet="summary" recordSchema="csw:Record" numberOfRecordsMatched="43" numberOfRecordsReturned="10" nextRecord="11"

By: Chris Holmes

Chris Holmes — Wed, 25 Apr 2007 14:42:54 +0000

In WFS 1.1 you can get the total number of features to be returned by a given query by doing resultType=’hits’.

As for CSW paging, yes, that’s definitely my inspiration. I need to get around to submitting a change request to WFS to adopt the same CSW semantics. I asked the editor of the spec and he wasn’t against it. Just need to write up the document. I also want to get CQL in to WFS - we’re already using it, and we have it for WMS as well. I need to write up some examples of how it’s useful.