Hi Martin, Wendy gave a good summary on the reasoning of not using URIs. We are wondering if you may have some additional comments so that we can address. Thank you so much!
Richard On Jan 27, 2014 11:16 AM, "Wendy Roome" <[email protected]> wrote: > Here's my response for "why resource ids instead of uris": > > An "ALTO Server" is a collection of services provided by a provider. That > provider may distribute these services over several different physical > servers, and that distribution may change over time. If we used URIs to > identify those services, the IDs would have to change whenever the provider > redistributed services. > > Therefore we defined "Resource IDs" as persistent, location-independent, > IDs for those services. Resource IDs must be unique, but only within the > context of one provider's services -- that is, the services defined by the > tree of IRDs reachable from a root IRD. That IRD tree maps those Resource > IDs to URIs, and allows the provider to change the mapping without > disrupting clients. Thus ALTO Resource IDs are relative to the URI of the > provider's IRD tree. If a provider had to use globally unique, > location-dependent URIs, instead of location-independent relative IDs, the > provider would have an unnecessary administrative burden. > > (Yes, I know "URIs", unlike URLs, are supposed to be "location > independent." But let's face reality: that only works if there's some > higher level mapping of URIs to locations. For all practical purposes, > "URI" means host-specific "URL".) > > Another way to look at it is that "Resource IDs" are like using relative > addresses within a web page. They make it easier to move a tree of related > pages from one host to another. > > - Wendy Roome > > From: "Y. Richard Yang" <[email protected]> > Date: Sun, January 26, 2014 at 16:40 > To: Martin Thomson <[email protected]> > Cc: "N:" <[email protected]>, "[email protected]" > <[email protected]>, Richard Alimi <[email protected]>, "Reinaldo Penno, > (repenno)" <[email protected]>, Wendy Roome <[email protected]>, > Sebastian Kiesel <[email protected]> > Subject: Re: Gen-ART review of draft-ietf-alto-protocol-25 > > > Section 10.2 defines a resource ID. Why do this when you could use > URIs? After all, that's what URIs are for. I realize that this would > be something of a major change to the protocol, but I think that the > question is particularly important. >
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