XDI/XRI Question

["Barnhill William" <barnhill_william@bah.com>]

I'm trying to get a better understanding of XRI by formulating a list of 
simple real world use cases, and wondered if I could bounce one off the 
list.

Would I represent the description "Bill's email", where @pin context was 
resolved by some third party using cell numbers or some other pin, as 
xri:@email.(@pin.=Bill)?

Actually I imagine that would be "The email that is Bill's" and "Bill's 
email" would be xri:(@pin.=Bill).@email, right?

Subtle difference, but unless one is an alias/synonym for the other then 
the authority first contacted for resolution would be different in the 
two cases, yes?  Which case above would be the preferred form?

Thanks,

Bill Barnhill