[mapserver-users] Odd warning in WFS GetCapabilities ~ what's missing in the config?

[Passmore, James H.]

Hi Jukka,

Thanks for persevering with this.

OK, so, the issue is not that I'm not using a shapefile (I'm using an OGR connection to an ESRI Geodatabase), or per se that I specified a list of SRS (the documentation shows a WFS_SRS list), but it is to do with the first cited SRS in the list.

So this original WEB METADATA "OWS_SRS" "CRS:84 EPSG:27700 EPSG:3034 EPSG:4258 EPSG:4326" fails

but his works (that is the error message in the GetCapabilities goes away)

WEB METADATA "OWS_SRS" "EPSG:4326 CRS:84 EPSG:27700 EPSG:3034 EPSG:4258"

with no need to specify an OWS/WFS LAYER METADATA section.

So the error message occurs when an unrecognized SRS is specified first.

As I understand it the processing precedence (assuming everything is otherwise correct) is:

MAP.WEB.METADATA.WFS_SRS (if this doesn't exist then check next)
MAP.WEB.METADATA.OWS_SRS (if this doesn't exist then check next)
MAP.PROJECTION (if this doesn't exist then check for the Feature)
LAYER.METADATA.WFS_SRS
LAYER.METADATA.OWS_SRS
LAYER.PROJECTION

If none then you get error:

<!--
WARNING: Mandatory mapfile parameter: (at least one of) MAP.PROJECTION, LAYER.PROJECTION or wfs/ows_srs metadata was missing in this context.
-->

There does appear to be a different processing precedence if there is some issue with the SRS, in such a situation you get:

MAP.WEB.METADATA.WFS_SRS (if this has error then check next)
MAP.WEB.METADATA.OWS_SRS (if this has error then check for the Feature)
LAYER.METADATA.WFS_SRS  (if this has error then check next)
LAYER.METADATA.OWS_SRS

If there is still an error/issue you get the same (now misleading) message:

<!--
WARNING: Mandatory mapfile parameter: (at least one of) MAP.PROJECTION, LAYER.PROJECTION or wfs/ows_srs metadata was missing in this context.
-->

I say misleading because MAP.PROJECTION, LAYER.PROJECTION are set here (EPSG:4326) but are ignored.  It is further misleading because ows_srs metadata is also set.


As I stated the service was working even with the warning in place (I think QGIS must just assume CRS:84 support because it isn't reported) e.g. this request 'works':

http://194.66.252.155/cgi-bin/BGS_OGE_Bedrock_and_Surface_Geology_in2/ows?SERVICE=WFS&VERSION=1.0.0&REQUEST=GetFeature&TYPENAME=GE.GeologicFault.BGS.EN.1M.Bedrock&SRSNAME=CRS:84

Really I am surprised that MapServer has been able to serve the request at all, but looking closer I see that I haven't got a CRS:84 response at all, what I have is an EPSG:4326 response, in fact I can specify any unrecognized SRSNAME and I get an EPSG:4326 response

For example:

http://194.66.252.155/cgi-bin/BGS_OGE_Bedrock_and_Surface_Geology_in2/ows?SERVICE=WFS&VERSION=1.0.0&REQUEST=GetFeature&TYPENAME=GE.GeologicFault.BGS.EN.1M.Bedrock&SRSNAME=UGH:00.

To me it looks like in the background MapServer must look at MAP.PROJECTION or LAYER.PROJECTION despite the error message, or else it must assume EPSG:4326 as a default.

Cheers

James







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