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Subject: Re: [xri] Backtracking
Tan, William wrote: > 1. Authority resolution and service selection are distinct phases. > When authority resolution completes, it is done and returns the > result to the calling function. It might be at the 3rd Ref out of 5 > possible Refs, and there is no way to continue where it left off. > 2. During service selection, if you see a Ref, you will spawn a > different authority resolution phase, but that has nothing to do > with the original authority resolution. This child authority > resolution phase also knows nothing about service selection. It > completes, and returns (if successful) the results back to the > caller, which is the service selection function. If this child > authority resolution phase fails and there are more Refs, the > service selection function will spawn another authority resolution > phase on the next Ref. Yes, well said, and that matches my understanding. John Bradley wrote: > This is the tricky bit. I am informed that the current spec sec > 11.5 intends that if the final XRD is returned and you do service > selection on it, and if that "does not" find the required SEP then > you must unwind back to the same point that you would have if the > XRD was not returned. So, are you saying that if I resolve @a*b*c and the XRD for *c does not contain the SEP I'm looking for, nor any REFs, I should go back and look in *b for that SEP? That would not make any sense to me. If however I follow an XRD level REF that I found in *c, and do not find the SEP I'm looking for in the last XRD for -that- resolution chain, I can go and examine any other REFs that I might have found in *c. But once I start following REFs, I cannot backtrack to before the XRD where I started following REFs. =vg
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