[mdx] what to trust

[Josh Howlett]

> One place that turns out to be a little wrinkled is the case 
> of a publisher with multiple practice statements.

Or, similarly, an aggregator consuming metadata from publishers with
different practise statements.

I think the existing use-cases would be satisfied by the metadata
consumer adopting a 'lowest common denominator' policy model, and so the
trust decorations already defined by SAML2Meta would suffice.

josh.

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