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Subject: RE: [wsn] Analysis of filtering
+1
Requirement of commutativity (or any particular positioning) on the open
content filters is too strict.
Since
we allow open content for filters, I think we are expected to remain
open about the composition of filters also. At the same time,
defining the nesting/composition rules for filters in BaseN would pull in a lot
of additional complexity, and I don't know if we want to go there
either.
Perhaps we could have the BaseN spec
-
Define the composition rules for the three filters defined by BaseN
(commutative, etc.)
-
Allow open content filters to also utilize the composition rules defined by
BaseN (a compositionRule attribute on the top level filter element with BaseN
specific default value)
-
Insert language to allow implementations (or other specifications) to
define and use new composition rules.
Hopefully this will provide support for interoperable filters out of the
box (spec defined) for the majority of use cases and still allow extensibility
for the complex ones (80-20).
Thanks,
Sanjay
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