MS WFS "Chaining"

[Bart van den Eijnden]

Hi Chris,

this is the sample MAP file I have just used to test this approach. I 
can do a GetFeature request to my localhost server and get the GML 
returned by the DM Solutions WFS service:

http://localhost/cgi-bin/backup/mapserv_46.exe?map=c:\ms4w\apps\chameleon\samples\map\samplewfs.map&request=GetFeature&service=WFS&version=1.0.0&typename=park

This is the MAP file used:

NAME DEMO
STATUS ON
SIZE 400 300
EXTENT -2594561 -712631 3467361 3840000
UNITS METERS
SHAPEPATH "../data"
IMAGECOLOR 255 255 255
TRANSPARENT FALSE

WEB
  IMAGEPATH "/ms4w/tmp/ms_tmp/"
  IMAGEURL "/ms_tmp/"
  METADATA
    wfs_onlineresource 
"http://localhost/cgi-bin/backup/mapserv_46.exe?map=c:\ms4w\apps\chameleon\samples\map\samplewfs.map&"
    wfs_title "test wfs"
  END
END

PROJECTION
    "init=epsg:42304"
END

LAYER
  CONNECTION "http://www2.dmsolutions.ca/cgi-bin/mswfs_gmap?"
  CONNECTIONTYPE WFS
  NAME park
  METADATA
    wfs_typename "park"
    wfs_title "park layer"
    wfs_version "1.0.0"
  END
  TYPE POLYGON
  DUMP TRUE
  CLASS
    STYLE
      SYMBOL 0
      COLOR 255 0 0
      OUTLINECOLOR 255 0 0
    END
  END
  STATUS ON
  PROJECTION
    "init=epsg:42304"
  END
END

END

Hope this helps.

Best regards,
Bart

chris at narx.net wrote:

>Hi Bart, thanks for the reply.
>
>Care to submit a small mapfile sample of what you think may work ? :)
>
>I have played around with the metadata such as the online resource url but no
>such luck
>
>Thanks :)
>
>Quoting Bart van den Eijnden <bartvde at XS4ALL.NL>:
>
>  
>
>>Hi,
>>
>>this could be done I think. On your middle tier, you would have a
>>Mapserver WFS client layer, which you also expose as a WFS server layer
>>on the middle tier. The middle tier will then request the remote
>>Mapserver WFS.
>>
>>So in summary, on your middle tier you would have a WFS Client layer in
>>your MAP file, and you would also expose your middle tier as a WFS
>>server using the appropriate wfs server metadata.
>>
>>Does this make sense :-) ?
>>
>>Best regards,
>>Bart
>>
>>Chris Tweedie wrote:
>>
>>    
>>
>>>Morning list,
>>>
>>>A current work in progress requires extensive use of mapserver's WMS service
>>>chaining. My question is that as far as i can tell, there is no way to do a
>>>similar method using remote WFS services.
>>>
>>>To clarify, i am not after MS as a WFS Client (eg. render the WFS response
>>>      
>>>
>>as an
>>    
>>
>>>image) but simply forward the response on to the client. For example,
>>>
>>>1. Client (WFS Request) --> Core Mapserver (Forward request) --> Remote
>>>Mapserver
>>>
>>>2. Remote Mapserver (GML Response) --> Core Mapserver (Forward request) -->
>>>Client
>>>
>>>I hope mapserver could be enabled as a sort of pseudo OWS "proxy" but I have
>>>      
>>>
>>had
>>    
>>
>>>a look around without much success,
>>>
>>>Ideally, if there was a new meta tag such as
>>>
>>>"wfs_response_method"    "GML"
>>>
>>>or something similar attached to the layer, then this would suit my purpose
>>>exactly. Since the response is currently stored as a GML file in the ms_tmp
>>>directory anyway, it seems a simple manner of just forwarding on the request
>>>instead of rendering it using GDAL/OGR.
>>>
>>>Any feedback would be appreciated,
>>>
>>>Chris Tweedie
>>>
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>>>
>>>
>>>
>>>
>>>      
>>>
>
>
>
>
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>
>  
>

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