[mdx] MDX & expressing communites-of-interest

[Scott Cantor]

Ian Young wrote on 2009-05-18:
> There are a couple of other variations that could perhaps be added to
> that list.

There's still another one, which is a SAML "affiliation", which has metadata
support already (though not in the sense that we've implemented anything
based on it).

I was considering that, though, and then extending the group-based policy
stuff in the SP to allow for Affiliation membership in addition to just the
containment model.

I started to think that affiliations might be a way to get the notion of a
"self-defined" group into the metadata layer. Today you can't easily create
RelyingParty settings based on groups that you manage yourself.

-- Scott