extensibility

I've done a bunch of thinking over the weekend about extensibility and
how it interacts with streamability. I've prototyped a solution in algae.
Take a peek at the Algae doc on profiles and extensibility [1] and an
extension (implemented, but poorly documented at this point) on adding
rules to query [2]. It uses and demonstrates the extensibility mechanism.

[1] http://www.w3.org/2004/05/06-Algae/#extensibility
[2] http://www.w3.org/2004/06/20-rules/
-- 
-eric

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