What is this XRD is for?

[Breno de Medeiros <breno@google.com>]

The XRD is metadata about a resource.

Given an XRD document, what is the resource it is about?

I think we should say in the spec that if no <Subject> is present,
then the spec does not define a mechanism to answer that question,
though extensions of the spec can provide a means to infer the answer
to this question.

If a <Subject> is present, then I think we should specify what it
means. <Alias> should be interpreted as 'metadata also for X' where,
where 'X' is inferred from the Alias using the same rules for the
<Subject>.

My thoughts currently are that the resource is the equivalence class
of URIs in a scheme-dependent way. My thinking is that these URIs are
alternative representations of the same resource, and XRDs are
meta-data about resources, not about a URI string.

E.g.: http://EXAMPLE.com http://example.com/ http://example.com:/
http://example.com:80/ are alternatives for http://example.com.


-- 
--Breno