[OpenID] host-meta and "acct:"

[SitG Admin]

>Don't get me wrong, I think having an optional Subject is a 
>pragmatic solution. I just think it de-values XRD itself to suggest 
>that an optional Subject is an appropriate extension point, since (I 
>suspect) the concept of Subject is shared by all users of XRD 
>whether or not the element itself appears in the document.

I agree, but I think it would be difficult to maintain privacy 
(anonymous XRD documents) if all the XRD elements specified what 
resources they applied to (much less where to find those). I think 
that applications which are concerned about mutual referencing, that 
way, can require the use of Subject or another element to do so; put 
in a strong warning about security so that developers who may be 
unaware of this concern know to watch out for it, and leave the 
possibility open (for developers who know what they're doing) to 
leave it out when so desired.

-Shade