Nested facets

I wrote about the concept of "nested facets" here:
http://poorbuthappy.com/ease/archives/002793.html

It's a very simple concept, but one that I think we should be aware of
(it isn't represented in XFML nor in Facetmap (afaik)), so that we can
make sure that it makes it into our tools.

I'm looking to see if this concept of nested facets has been
described/discussed elsewhere (in the LIS community?), probably using
other terms...

I'd like to spread knowledge about it, but I want to use a terminology
that already exists, if any.

Thanks for any pointers!
Cheers,
Peter






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