[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] re URN, URL, URI
Amit Rekhi wrote: | Hello, | After having gone through the URI specs at the w3c site I wanted | to confirm a few doubts. I'd be grateful if anyone would kindly help. Assuming these are the current versions of the specifications from the IETF, where the URN work is done: | DOUBT 1 :- URNs at this point are not widely used since there is no | generally available resolution service. In case a resolution infrastructure | comes up in time :- There is a generally available resolution mechanism, through DNS, but it has not implemented except on a test basis so far as I know. URNs, of course, may be useful within more constrained contexts. Note that URN resolution won't happen for you without some effort on your part. | * Where would the service reside(client/server)? You would want to have resolution hints on the client end, and be able to check your cache for documents you already have; otherwise consult RFC 2168 for the DNS approach. | * Would the server simply serve all the docs that contain FPIs to the client | or would it resolve the FPIs to system IDs before serving the docs to the | client or would it "selectively" serve files depending upon the FPIs it can | resolve? A URN resolution service will only resolve URNs. It might be coupled with a document server, but that's another matter. RFC 2168 indicates the possible services that could be specified (N2N, N2L), but there is no requirement that a resolution services support any particular one of them, I believe. An FPI as it stands is not a URN, but were an FPI name space defined for URN use, FPIs can be escaped and encoded as URNs. | * Would the client in anyway be involved in resolving the FPI -> Sys ID? If the URN resolution service returns a URL, presumably you'd want the client to resolve the URL. | DOUBT 2 :- URN simply stated refers to a globally unique, persistent name | from a NameSpace. This name could be used to provide a label to resources. | | * Could a URN also label a resource which may not necessarily be residing on | the web? | ( I could label a resource with a URN ,and the resource could very well be a | set of paper documents! | This could happen in a scenario where 2 parties provide a paper resource | with a URN and transmit only the URN in their XML files to each other. The | resource could be transmitted on paper since it is a set of paper | documents ) Yes. This is not a bug. | DOUBT 3 :- Talking in terms of URI, if a URI is not a URLthen it HAS to be a | URN and vice versa. Am I right? At this point, yes. URCs were talked about, but those interested in URCs are now mostly doing RDF. regards, Terry Allen Terry Allen Veo Systems, Inc. Business Language Designer 2440 W. El Camino Real tallen[at]sonic.net Mountain View, Calif., 94040 Common Business Library - available at http://www.veosystems.com/ xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i... Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ To (un)subscribe, mailto:majordomo@i... the following message; (un)subscribe xml-dev To subscribe to the digests, mailto:majordomo@i... the following message; subscribe xml-dev-digest List coordinator, Henry Rzepa (mailto:rzepa@i...)
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