The answer (apparently) to list each function with a "fallback value"; 
please see the SE 1.1 specification for details.
So you would list all the possible functions; if the user tries to call 
a function in a context where it can not be understood the fallback 
value would be used.

I am not saying this is a great solution; just the one developed by the 
SE 1.1 spec.
Jody


> Because WFS does not allow different functions by feature type, 
> functions not supported by all feature types cannot be published in the 
> WFS capabilities. So how do clients know what they can call? There has 
> to be some sort of back-channel agreement. Some have referred to this as 
> a profile, and the publication and discovery of these is an open 
> question. (Cue Rob Atkinson ...)
>
>   
>> Sorry I did not have the time to follow the debate on this topic
>> when it was happening (a couple months ago I believe), so maybe
>> I'm missing something obvious here?
>>     
>
> No, these are the right questions to ask.
>
>   


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