[OpenID] host-meta and "acct:"

[SitG Admin]

I suddenly find myself with a much better idea of what "Subject" is 
for, and it worries me. I strongly agree with the decision to drop it.

>This is metadata for any resource that says this is its metadata, ie 
>any resource with a "describedby" link pointing here.

So, if I were so inclined, I could link my own files to it (trusting 
that it would remain appropriate to my own purposes). Any number of 
people could share the same XRD file, instead of duplicating it; a 
new XRD file would not need to be created to accompany different 
resources.

>There is no URI for that collections of resources that could be put 
>in <Subject>.

Privacy: anonymous XRD's, useless without knowing *what* resource(s) 
it was meant to apply to.

-Shade