[mdx] Concepts document V1.9

[Josh Howlett]

> Josh, do you see a chance to find time to work in this 
> direction so a shorter version would be ready for the GN3 
> meeting mid next week?

Not a chance, I have no time :-/.

I was planning on announcing the fact that the MDX work was going on,
and that SA3 - through SWITCH's participation - would implement it for
eduGAIN.

josh.

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