[OpenID] host-meta and "acct:"

[SitG Admin]

>you cannot have an empty subject.  See section 1.5.2:
>
>>  Unless otherwise noted in this specification or particular 
>>profiles, all URIs in XRD documents MUST consist of at least one 
>>non-whitespace character.

Will, please refer to Santosh's message - the one I quoted in my reply:

>Why are you guys so stuck up on allowing XRD's with no Subject?
>
>If you really want to do that, why don't you allow for an "Anonymous 
>XRD" who's Subject is empty?

To recap, Santosh proposed an alternative to omitting the Subject 
field entirely: making it empty instead. I am simply countering that, 
if it is conceptually acceptable (ignoring the specs for a moment) to 
have an empty Subject, it ought to be conceptually acceptable to omit 
that field entirely when there is no practical difference in parsing 
- you either find it, or you don't. If the latter, you may treat it 
as being empty, having some reserved name that stands for "ignore 
this", self-referential, whatever! Use one object for parsing the 
data, and then filter it so your interpreter doesn't choke.

-Shade