SLD Filter Using Default Mapfile Rendering

[John Fletcher]

> What you could do is, if the data you're fetching is 
> available as OGC:WFS, is use MapServer as a WFS client and 
> apply the filter at the mapfile (or dynamically generated) 
> level and assume the same rendering as per mapfile.

That's a really good idea - one I hadn't considered.  The only problem
is that I need to be able to apply a filter dynamically through the CGI
interface (I'm assuming Mapserver doesn't expose any CGI interface to
access the filter for WFS layers).

Has there ever been talk of the implementation of a DefaultSymbolizer in
the SLD spec that would do this sort of thing?  I suppose the SLD spec
could also just recommend a default action for a WMS to take if no
Symbolizer is present.  Of course, I could just be exposing my ignorance
of the whole subject...

Thanks for the help.

John