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Re: Can XPointers be used as a name (was Re: RDDL for names ?(was Re:XMLSchema built-in data typenamespaceURI.))
- From: Charles Reitzel <email@example.com>
- To: "Simon St.Laurent" <firstname.lastname@example.org>
- Date: Mon, 12 Mar 2001 22:57:21 -0500
That was one of the threads (Distributed RDDL) I started reading before I noticed the January date... This time I went and read (most of) Keith Moore's RESCAP draft and immediately I thought of the last great NS URI dereferencing war. At the time I said something like, "if you had a DNS-like substance for URIs, you could look before you leap."
Have a look at http://www.ietf.org/internet-drafts/draft-moore-rescap-rc-00.txt
A RESCAP recursive query would help RDDL processing (the client could pass the NS URI back and receive all the URIs contained in the document). It seems a bit tricky to capture both arcrole and role in the results (simple attribute name/value pairs).
RESCAP could work fine for simple NS URI aliasing, however. I.e. you could use a good, long term URN-type NS URI and provide a list of mirrored, load-balanced and/or locally cached instances of the schema document available over either HTTP or FTP. Because it supports signed data, a local server could maintain a secure cache.
take it easy,
At 01:04 PM 3/12/01 -0500, you wrote:
>At 03:43 PM 3/12/01 +0100, Eric van der Vlist wrote:
>>The URI may be a good schema location for my processing needs and a bad
>>choice as a base name for my datatypes.
>>The prefix is a shorthand for the namespace URI that is, in principle,
>>independent of the schema location.
>>This is a powerful feature of W3C XML Schema that would be lost if the
>>namespace URI had to match the schema location.
>I'm starting to wonder if maybe we need options which combine the
>capabilities of RDDL with the indirection of technologies the IETF is
>developing for asking questions about the nature of particular URIs.
>URI metadata might dig us out of this problem. Is Michael Mealling around?
>Simon St.Laurent - Associate Editor, O'Reilly and Associates
>XML Elements of Style / XML: A Primer, 2nd Ed.
>XHTML: Migrating Toward XML
>http://www.simonstl.com - XML essays and books
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take it easy,