Yahoo available AX attrs - more on numeric validation level

[Allen Tom]

I think the more general idea for AX 2.0 is to define a way for structured
data (aka objects) to be shared. This might conflict with the goal of making
the messages compact.

At least with the case of email address, we'd like a way to return the email
address, as well as attributes about the address. Ideally, we'd make this
mechanism generic so that any attribute can have metadata associated with
it. 

Allen


> The spec would need to require the colons, and probably permit empty
> strings in place of the numbers when an OP wanted to say nothing at all
> about validation, e.g.
> 
> openid.ax.d.c=::+1-555-555-1212
>