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Fw: NEW ISSUE: use RDDL instead of XML Schema at the namespace URI?

From: Sanjiva Weerawarana <sanjiva@opensource.lk>
Date: Fri, 15 Apr 2005 23:12:12 +0600
Message-ID: <00e601c541de$48b19570$c0734109@LANKABOOK>
To: <www-ws-desc@w3.org>

Jonathan, shouldn't we do the same? At least recommend that what
should be at the end of the TNS should be RDDL?

Sanjiva.

----- Original Message ----- 
From: "Jonathan Marsh" <jmarsh@microsoft.com>
To: <public-ws-addressing@w3.org>
Sent: Friday, April 08, 2005 5:34 AM
Subject: NEW ISSUE: use RDDL instead of XML Schema at the namespace URI?


> 
> Background:
> 
> As many of you are aware, there is an ongoing debate on what kind of
> resource should be placed at the namespace URI.  The TAG has been unable
> to recommend a practice in this area, despite a lot of discussion.
> 
> The W3C, AIUI, has a policy that there should be some document at the
> namespace URI, but does not enforce a particular format.  In general
> namespace URIs seem to return HTML documents.
> 
> There are also many proponents of RDDL [1], which is simply an XHTML
> document with some machine-processable XLinks in it pointing to
> associated resources like schemas.
> 
> Justification:
> 
> One advantage of RDDL is that it would enable one to discover, through
> the namespace URI, a number of schemas for the namespace.  This is
> especially interesting when errata are taken into account.  The WS-I BP
> promulgated some fixes to the WSDL 1.1 schema, but since it is also
> desirable to have a stable document at the namespace URI, it published
> alternative dated versions with various fixes in them, and pointed to
> those dated versions from the spec.  It might have been simpler and more
> discoverable to find all the related (dated) schemas through a RDDL
> document at the namespace URI.
> 
> Proposal:
> 
> Place a RDDL document at each of the namespace URIs defined by WS-A.
> Provide a "latest schema" link as well as dated links to the schema.
> State in the document that the resources (schemas) at the dated links
> are immutable, the list of dated schemas may grow to incorporate fixes,
> and the latest schema link will always point to the latest.
> 
> A necessary related change to the specs is for sections of the specs
> which say that a schema is available "at" the namespace URI to be
> updated to say "through" the namespace URI, or some such.
> 
> Caveat:
> 
> Microsoft feels there are some benefits to this proposal to the extent
> that it doesn't take us down the rabbit hole of attempting to solve the
> general problem of what should go at a namespace URI.  We would prefer
> the status quo to spending significant amounts of time on this subject.
> 
> [1] http://www.rddl.org/
> 
Received on Friday, 15 April 2005 17:12:42 GMT

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