[mdx] MDX & expressing communites-of-interest

[Josh Howlett]

> OK, I was assuming we were talking about multiple communities 
> who might all be associated with, say, Web SSO.  That seems 
> like an important use of the concept too.

Sure.

> > Are our porpoises uncrossed?
> 
> For the example you give above, I have no problem at all with 
> the idea that an aggregator could suck up an affiliation 
> entity and use it to produce an aggregate containing just 
> those entities named, say the eduroam ones.  When your 
> communities are disjoint, that's fine.  It's not the general 
> case, though, and I want to talk about the general case as 
> well as the one you're interested in.

I agree its not the general case, but its one that appears to satisfy my
use-cases. Providing that the general case addresses it, I'm happy :-)

josh.

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