[mapserver-users] cascading mapserver

[Bart van den Eijnden]

Hi,

thanks all for the answers.

The only problem is that my vendor specific parameter (query_params) is not 
static, it is dynamic. Everytime the client makes a selection, a different 
where clause (like ID = 30) is sent in the query_params part of the 
request.

Does anybody know if OGC has something in their specification for 
dynamically querying WMS layers and retrieving the selection e.g. in red in 
the image retrieved?

Thanks,
Bart

On Thu, 27 Mar 2003 11:32:48 -0500, Daniel Morissette 
<morissette at dmsolutions.ca> wrote:

> Bart van den Eijnden wrote:
>>
>> How does it work with vendor specific parameters? I want to use 
>> mapserver
>> to be a cascading mapserver for 2 mapservers of a different brand. But
>> those guys have made vendor specific parameters like query_layers and
>> query_params to get a selection highlighted in the map.
>>
>> Will mapserver send those vendor specific parameters (although not 
>> OpenGIS
>> WMS parameters) to the mapserver of the different brand?
>>
>
> If you include vendor-specific parameters in the CONNECTION URL in your
> layer definition then MapServer will just forward those parameter and
> ignore them.  In other words, the CONNECTION URL in a WMS layer
> definitino is an opaque string and MapServer doesn't try to parse it or
> validate the parameters in it.  Well, there is one exception: it checks
> the VERSION parameter in the CONNECTION url to makes sure that it builds
> its parameters properly, but it doesn't change any of the
> vendor-specific parameters.
>
> FYI QUERY_LAYERS is not vendor-specific: it's part of the spec.  OTOH,
> QUERY_PARAMS would be considered vendor-specific.  So hopefully this WMS
> doesn not complain if you include a QUERY_PARAMS value in a GetMap
> request, if it doesn't complain then just include your QUERY_PARAMS
> value in the CONNECTION url in your mapfile and you should be fine.
>
> Daniel



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  Bart van den Eijnden
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