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Subject: RE: [xri] versioning of authirity section

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.

Would you go so far as to version parts of the name authority?  For example:


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?


> -----Original Message-----
> From: Peter C Davis [mailto:peter.davis@neustar.biz]
> Sent: Monday, April 21, 2003 1:09 PM
> To: Lindelsee, Mike
> Subject: Re: [xri] versioning of authirity section
> Not sure it is required.  I do not recall seeing a requirement that 
> XRI:URI's MUST resolve (forever). While i do agree that resolution 
> processing language needs special attention in these cases. All the 
> resolver can do is locate the "current" resource at the noted 
> location, 
> not the version instance. However, using RegEx (but requiring 
> the input 
> string being the complete URI), one could rewrite the "versioned 
> authority" to a "versioned resource" during dereferencing using DDDS.
> I think this could be particularly powerfull when the authority 
> host.foo.biz[;2002-04-01T20:10:23Z]/this/resource is declared 
> equivelent 
> (aka Cross-Referenced) to some other XRI (say 
> urn:foo:(+resource)[;2003-04-12T00:00:00Z]
> --- peterd
> >>line 159:
> >>[ISSUE: It would be nice if naming authority parts were NOT 
> >>versioned to 
> >>make resolution simpler. Then, only the  local part  segments have 
> >>versioning info in them, and interpretation of this versioning 
> >>information would be local to the client and ultimate  leaf  
> >>directory. ]
> >>
> >><snip/>
> >>
> >>xri://some.domain.int[;2001-03-04T20:15:40Z]/foo/bar
> >>
> >>esp. since URIs are re-assignable. This allows for "This was the 
> >>authority at time T".
> >>
> >>--- peterd
> >>
> >>
> >>    
> >>

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