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Subject: Dropping the word 'Canonical' from XRD

Subject is described as "Provides the canonical identifier for the resource described by this XRD". I think the word 'canonical' does not make sense here and should be removed. Subject is simply the subject of the document and Alias are other names it is known by. Subject might be considered canonical if there are aliases present, but alone, it does not really have that clear meaning.

It should be perfectly fine to describe a resource which has two URIs by its non-preferred URI since that may change over time without creating a need to update descriptors as the preferred URI changes. There could also be deployments where different protocols require different URI structures, and each will describe the same resource but with a different primary URI.

Of course, protocols can designate additional meaning to the Subject element and declare it as canonical for their use cases.


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