> The idea works for me provided the following two also work, so that we don't 
> break backwards compatibility:
Updating your example as they refer to two different implementations that take 
different numbers of parameters:

// the use of string is supported with ':' used to act as a short hand for 
qualifying a name
// (providing access to two different implementations of buffer as shown here)

Expression expr = ff.function( "jts:buffer", ff.property("geom"), 
ff.literal(32), ff.literal("round") );
Expression expr = ff.function("buffer",ff.property("geom"), ff.literal(0.3));
> The first should work to allow lookups to still work from SLD or filter, 
> where we cannot specify a Name but only
> a string.
> 
> 
> 

Correct; justin's patch does work as you describe. I will update the proposal 
page.

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