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RE: WebDAV Bindings - Issue Yaron.ApplePie3

From: Slein, Judith A <JSlein@crt.xerox.com>
Date: Tue, 18 Jan 2000 11:09:11 -0500
Message-ID: <8E3CFBC709A8D21191A400805F15E0DBD24569@crte147.wc.eso.mc.xerox.com>
To: "'Yaron Goland'" <yarong@Exchange.Microsoft.com>, "Slein, Judith A" <JSlein@crt.xerox.com>, w3c-dist-auth@w3.org
This resolution sounds good to me.

--Judy

> -----Original Message-----
> From: Yaron Goland [mailto:yarong@Exchange.Microsoft.com]
> Sent: Tuesday, January 18, 2000 11:02 AM
> To: 'Slein, Judith A'; w3c-dist-auth@w3.org
> Subject: RE: WebDAV Bindings - Issue Yaron.ApplePie3
> 
> 
> I suspect the issue is better described as "Can a user rely 
> on getting back
> a complete list of all the bindings they are allowed to see 
> when they ask
> for a dav:bindings property?"
> 
> I suspect Judy's answer will be "yes". Which is certainly 
> reasonable. If so,
> then we need to clarify the language in the spec to make this 
> clear. This is
> definitely a conclusion one can come to from reading the spec 
> but it would
> be useful if the conclusion was explicitly addressed. 
> Language such as "A
> client can rely upon the contents of the DAV:bindings 
> property specifying
> all bindings for that resource that the client is authorized 
> to know about."
> 
> That having been said, it is also fairly clear that a design for weak
> bindings will most likely want to use the DAV:bindings 
> property. The reason
> being that if one is performing a search one will almost 
> certainly want to
> search on both weak and strong bindings. If one wants one 
> over the other,
> one can always select the search based on resource type as 
> weak bindings
> will almost certainly have their own resource type. Strong bindings
> obviously don't require their own resource type as, by 
> definition, every
> WebDAV resource (to some extent or another) is a strong binding.
> 
> As such I would like to see the DAV:bindings definition 
> language tweaked to
> say something along the lines of "DAV:bindings, when used 
> with bindings as
> defined in this specification,...."
> 
> By putting in the parenthetical phrase the weak bindings spec 
> will be able
> to say "DAV:bindings, when used with weak bindings, provides a list of
> available bindings. This list may not necessarily be complete."
> 
> 			Yaron
> 
> 
> > -----Original Message-----
> > From: Slein, Judith A [mailto:JSlein@crt.xerox.com]
> > Sent: Tue, January 18, 2000 7:36 AM
> > To: 'Yaron Goland'; w3c-dist-auth@w3.org
> > Subject: RE: WebDAV Bindings - Issue Yaron.ApplePie3
> > 
> > 
> > Comments in <js> </js> below.
> >  
> >  -----Original Message-----
> > From: Yaron Goland [mailto:yarong@Exchange.Microsoft.com]
> > Sent: Sunday, January 16, 2000 8:26 PM
> > To: w3c-dist-auth@w3.org
> > Subject: WebDAV Bindings - Issue Yaron.ApplePie3
> > 
> > 
> > 
> > Section 11 of the BIND spec states: "A PROPFIND requesting 
> > DAV:bindings MUST
> > return only those bindings that the client is authorized to see."
> > 
> > This brings up a couple of questions. The first question is 
> > "How do I ever
> > know if I have the definitive list of bindings?" I suspect 
> > the answer is
> > "you don't" since there may be bindings you aren't 
> authorized to see. 
> > 
> > <js> Right. </js>
> > 
> > This then brings us to another sentence in section 11 which 
> > reads "If the
> > DAV:bindings property exists on a given resource, it MUST 
> > contain a complete
> > list of all bindings to that resource."
> > 
> > However this means that the dav:bindings property must 
> always return a
> > complete list of bindings which the sentence following it 
> > (given at the
> > start of this letter) contradicts. 
> > 
> > <js> I don't see this as contradictory.  The value of the 
> > property on the
> > resource is the complete list of bindings.  What gets 
> > returned in response
> > to any particular PROPFIND request is some subset of that 
> > value. </js> 
> > 
> > One should never have two MUST level requirements that are in direct
> > contradiction. The reason for the contradiction is that we 
> > have raised the
> > bar too high on the contents of the dav:bindings property 
> > value. We have
> > already specified that due to security concerns it is 
> > absolutely impossible
> > for you to ever be sure that you necessarily have the 
> complete list of
> > bindings. Therefore requiring that the complete list be 
> > returned, even as
> > the default in the absence of security concerns, is self defeating.
> > 
> > Therefore I move that the language in section 11 be changed 
> > to read that the
> > dav:bindings property may contain zero or more of the 
> > bindings available on
> > a resource rather than the definitive set since it is impossible to
> > meaningfully require that the definitive set be returned.
> > 
> 
Received on Tuesday, 18 January 2000 11:09:28 GMT

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