function symbols in SWRL FOL

Hi all,

I have a question regarding SWRL FOL [1] to which someone here might 
know the answer:

SWRL FOL is an extension of SWRL to first-order logic. However, there do 
not appear to be any function symbols in the language. Did I overlook 
something in the document?
Could someone tell me why we would want to restrict the expressiveness 
of the language? Why not define a full first-order logic and define 
subsets with some specific desirable properties?

Thanks for the clarification!


Best, Jos


[1] http://www.daml.org/2004/11/fol/proposal

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