Per-request filtering of data
The WMS specification allows the use of vendor parameters in requests. Vendor parameters are non-standard (that is; the parameter is not part of the OGC specification) request parameters that have been implemented by a vendor to provide enhanced capabilities. While vendor parameters are useful to provide enhanced capabilities, care must be taken when using them in your own client-side implementations. If you are making a generic client application that can target multiple WMS servers, then it is quite likely that they will be from a range of vendors. If you use a vendor-specific request parameter to a server that is not aware of it, you might see errors occurring. However, if you know for sure that you are targeting ...
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