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RE: COPY and bindings II

From: Nevermann, Dr., Peter <Peter.Nevermann@softwareag.com>
Date: Fri, 22 Aug 2003 14:03:35 +0200
Message-ID: <DFF2AC9E3583D511A21F0008C7E6210605C4802B@daemsg02.software-ag.de>
To: "'WebDAV Mailing List'" <w3c-dist-auth@w3.org>
On behalf of Geoff Clemm:

Peter:  This keeps bouncing when I try to send it to the 
w3c-dist-auth@w3c.org mailing list ... could you try posting it for me?


----- Forwarded by Geoffrey M Clemm/Lexington/IBM on 08/21/2003 04:15 PM 

Geoffrey M Clemm/Lexington/IBM
08/20/2003 06:08 PM

"Nevermann, Dr., Peter" <Peter.Nevermann@softwareag.com>
"'w3c-dist-auth@w3c.org'" <w3c-dist-auth@w3c.org>, 
Re: COPY and bindings II

Yes, we need language to cover the case Peter describes.  I suggest we
add the sentence:

If because of multiple bindings to a resource, more than one source
resource updates a single destination resource, the order of the
updates is server defined.

Also, I notices that the current description of COPY does not fully cover
the case where the COPY creates a new copy of a resource when there were
multiple bindings to that resource in the source of the copy.  To remedy
this omission, I propose that we replace the final paragraph of section 
of the Binding protocol with:

If a COPY request would cause a new resource to be created
as a copy of an existing resource, and that COPY request
has already created a copy of that existing resource,
the COPY request instead creates another binding to the
previous copy, instead of creating a new resource.

Peter wrote on 08/17/2003 08:57:46 AM:

> A while ago I asked, whether - assuming no resource at destination 
> to overwrite - COPY should preserve bindings, i.e. should COPY yield
> 1) or 2) (see below):
> 1) 
>       |u1     --COPY-->    |u2 
>       C                    C' 
>     a/  \b               a/  \b 
>     C1  C2               Ca  Cb 
>     x\  /y              x|    |y 
>       R                  Rx  Ry 
> 2) 
>       |u1     --COPY-->    |u2 
>       C                    C' 
>     a/  \b               a/  \b 
>     C1  C2               Ca  Cb 
>     x\  /y               x\  /y 
>       R                    R' 
> Most of you voted for 2). 
> Now, assuming there *were* resources at destination to overwrite - 
> take diagram 1) for visualization, where C', Ca, Cb, Rx, Ry all 
> existed beforehand - I assume that COPY u1->u2 would result in Rx 
> and Ry both being updated with content + dead-properties from R.
> And, again using diagram 1) and assuming all shown resources existed
> beforehand, what happens if we do the COPY the other way round, i.e.
> COPY u2->u1? The Binding spec states in section 2.3, last paragraph:
> "If a COPY causes one or more existing resources to be updated, the 
> bindings to those resources MUST be unaffected by the COPY."
> Is it then correct, that while copying the C'-tree over the C-tree, 
> resource R is first updated by Rx and then again by Ry (or the other
> way round)? That is, one of Rx or Ry "wins" in updating R? Hm???
> Regards, 
> Peter 
Received on Saturday, 23 August 2003 07:12:23 UTC

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