[mdx] what do do about duplicates

[Josh Howlett]

> What is the aggregator to do if it receives different 
> metadata for the same entityID from 2 different sources?

Policy decision time?

For eduGAIN, I was vaguely thinking that the entity with the 'strongest'
associated registration assurance wins (e.g. proof of possession-of-key
associated with an EVCert > proof of ownership of domain >
self-assertion).

josh. 

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