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Subject: RE: [obix] FW: [wsrf] Fw: NEW ISSUE: use RDDL instead of XML Schema at the namespace URI?

RDDL is an excellent tool for documenting XML formats and an excellent resource to be referenced by the namespace URI.  I think this was tossed around as a possibility in the obix xml group last fall, its probably worth considering again.  

I haven't seen an announcement from the chair yet (maybe it slipped by already) - Power Measurement has decided to withdraw from OBIX which is why I have been so silent the last few months.  It has been rewarding participating in OBIX and the vision is still compelling. 


-----Original Message-----
From: Considine, Toby (Facilities Technology Office) [mailto:Toby.Considine@fac.unc.edu] 
Sent: Friday, April 08, 2005 06:58
To: obix@lists.oasis-open.org
Subject: [obix] FW: [wsrf] Fw: NEW ISSUE: use RDDL instead of XML Schema at the namespace URI?

Interesting next step, perhaps?


"Is minic bhris beal an duine a shron.."
   'Tis often a man's mouth that broke his nose.."
                                   Old Irish saying =================================================== 
Toby Considine               | Phone  (919)962-9073 
Facilities Services          | Fax    (919)962-1102 
University of North Carolina |  
Chapel Hill, NC              |   tobias@fac.unc.edu 

-----Original Message-----
From: Tom Maguire [mailto:tmaguire@us.ibm.com] 
Sent: Friday, April 08, 2005 8:37 AM
To: wsrf@lists.oasis-open.org
Subject: [wsrf] Fw: NEW ISSUE: use RDDL instead of XML Schema at the
namespace URI?

Interesting issue has been raised in WSA WG that may be applicable to us as
well.  See below.


Perfection is achieved, not when there is nothing more to add, but when
there is nothing left to take away.   - Antoine de Saint-Exupery

T o m   M a g u i r e

STSM, On Demand Architecture

Poughkeepsie, NY  12601
----- Forwarded by Tom Maguire/Hawthorne/IBM on 04/08/2005 08:35 AM -----

public-ws-addressing-request@w3.org wrote on 04/07/2005 07:34:15 PM:

> 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/

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