Re: [xri] versioning of authirity section

[Peter C Davis <peter.davis@neustar.biz>]

Lindelsee, Mike wrote:

>Even though XRIs don't always need to resolve, I tend to think of the modal case as being URIs that do resolve.  If versioning can be applied to name authorities, I definitely agree that we need to pay close attention to the details of what that means and how resolution is specified/handled.
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Agreed.

>Would you go so far as to version parts of the name authority?  For example:
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>   host[;2002-04-01T20:10:23Z].foo.biz/this/resource
>
>My sense is that using versioning on parts of a DNS name might complicate things more that it would be worth.  Such a feature might be easier to implement with name authorties that don't use DNS names (since we are creating a new resolution mechanism for those anyway).  Thoughts?
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This is not as unreasonable as it may seem at the surface.  The DNS has 
this capacity today with serial numbers on zones (commonly expressed as 
[\d]{4,4}[\d]{2,2}[\d]{2,2}[\d]{2,2} or yyyymmddnn).  So, for larger, 
distributed zones, you could even have:

    host[:2002030402].foo.bar[:2002020145].biz/this/resource

trouble is, in general, that only the zone authority can express such an 
XRI.  Others _could_, but only through digging (pun intended) deeply 
with DNS administrative tools (getting zone serial numbers).  I do not 
think we should deliberately exclude such a structure from XRI.

As for non-DNS names, as you point out, things could be simpler (esp. 
for HTTP-based resolution)

--- peterd