Hi Andrea:

A while ago you talked about using an Expression (rather than a 
PropertyName) in Rule; we have a similar thing in the symbolizers where 
Expressions is already allowed.

At the time our conversation got stuck based on how to calculate the 
effective bounds of an expression (with a couple ideas ventured based on 
evaulating the expression on an extent or polygon covering the area for 
which the data set was valid).

Are you still interested in perusing these ideas? I ask because I am 
having similar fun with the symbolizer interfaces right now.

Jody

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