Re: [cmis] Re: Note on CMIS utilizing COPY and MOVE verbs

[Al Brown <albertcbrown@us.ibm.com>]

>Is the assumption that the server will assign the collection-local name?
That is the APP behavior - After POST, Content-Location header is returned with the location of the [new] resource [in that collection].  The server may specify the new location as a collection-local name.  Or it may not.  The FileNet prototype does not use collection-local names, but rather bases the URI off of the underlying object id.

>If we wanted to use COPY/MOVE, we'd need an extension (such as
>"Destination-Collection" instead of "Destination"). On the other hand,
>we could standardize the "Allow-Rename" header
>(<http://msdn.microsoft.com/en-us/library/aa142703(EXCHG.65).aspx>),
>which apparently is already supported in some Microsoft products.
I would prefer Destination-Collection.  However, how do we advertise to clients that COPY/MOVE does not support Destination but Destination-Collection header?  Also, how do we map removeObjectFromFolder?  

We could either add a new header (e.g., removeFrom) or a new verb.  However, I do not get a warm feeling from this approach so far.  I think it would be cleaner to have new verbs or have those verbs clarified in an rfc for this use case first.

-Al

Al Brown
Emerging Standards and Industry Frameworks
CMIS: https://w3.tap.ibm.com/w3ki07/display/ECMCMIS/Home
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Julian Reschke ---04/15/2009 10:14:20 AM---Al Brown wrote:

From:	Julian Reschke <julian.reschke@greenbytes.de>
To:	Al Brown/Costa Mesa/IBM@IBMUS
Cc:	cmis@lists.oasis-open.org
Date:	04/15/2009 10:14 AM
Subject:	[cmis] Re: Note on CMIS utilizing COPY and MOVE verbs

---

Al Brown wrote:
> Julian,
> 
> I saw a post on the JSR list and it prodded to me to (re)read the 
> appropriate rfcs. If you look at copy 
> (http://tools.ietf.org/html/rfc2518#section-8.8) or move 
> (http://tools.ietf.org/html/rfc2518#section-8.9), it is articulated to 
> copy (or move) a resource from location a (uri1) to location b (uri2). 

The relevant RFC nowadays is RFC 4918, but, yes, that is correct.

> These locations are fully specified to be where the object will live 
> after the verb. They include the location under the folder, rather than 
> uri2 being the uri to the folder. Am I understanding COPY and MOVE 
> correctly in WebDAV?
> 
> This is a discrepancy with the CMIS model.
> 
> In CMIS, we have:
> - moveObject (object, folder)
> - addObjectToFolder(object, folder)
> - removeObjectFromFolder(object, folder)
> 
> In WebDAV case COPY/MOVE would want uri2 to contain the location of the 
> object in the folder: e.g. http://foo/folder1/newlocation where in CMIS 
> it should be http://foo/folder1.

I keep forgetting that :-).

Is the assumption that the server will assign the collection-local name?

> In CMIS, there is not a notion of path, only folder containment. All 
> URI's in the rest binding are basically repository-specific how they are 
> generated. The most a client can do is specify the Slug ala app.
> 
> If we would like to use COPY and MOVE, wouldn't we have to redefine COPY 
> and MOVE for CMIS?

If there's no way for the client to "guess" the final URI (like "new 
folder name / old local name" -- which I doubt), then yes, MOVE and COPY 
wouldn't work as desired.

If we wanted to use COPY/MOVE, we'd need an extension (such as 
"Destination-Collection" instead of "Destination"). On the other hand, 
we could standardize the "Allow-Rename" header 
(<http://msdn.microsoft.com/en-us/library/aa142703(EXCHG.65).aspx>), 
which apparently is already supported in some Microsoft products.

BR, Julian


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