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RE: Clarification on what exactly is captured in the Baseline Col lection...

From: Clemm, Geoff <gclemm@rational.com>
Date: Thu, 27 Sep 2001 13:06:10 -0400
Message-ID: <3906C56A7BD1F54593344C05BD1374B103F8AC0F@SUS-MA1IT01>
To: ietf-dav-versioning@w3.org
Looks good to me.  It would be great if you could put this slide set (and
the others you have created) up on a web site that we could link to from the
deltav site.  If you don't have access to a public web site you can author,
we could also just post the .ppt files directly on the deltav site (I try to
minimize the number of fat files we put up on the deltav site itself, to not
use up an excessive amount of Greg's disk space, and .ppt files are known to
be not skinny:-).
 
Cheers,
Geoff

-----Original Message-----
From: Peter Raymond [mailto:Peter.Raymond@merant.com]
Sent: Thursday, September 27, 2001 10:36 AM
To: Tim Ellison; ietf-dav-versioning@w3.org
Subject: RE: Clarification on what exactly is captured in the Baseline Col
lect ion...



Hi, 

To make this even clearer I have attached some powerpoint slides showing a
collection 
hierarchy before BASELINE-CONTROL and after BASELINE-CONTROL. 


Does it look correct? 

If it is, does the group think this would be useful to have avilable on
www.webdav.org/deltav 
to help explain the baseline concept? 

Regards, 
-- 
Peter Raymond - MERANT 
Principal Architect (PVCS) 
Tel: +44 (0)1727 813362 
Fax: +44 (0)1727 869804 
mailto:Peter.Raymond@merant.com <mailto:Peter.Raymond@merant.com>  
WWW: http://www.merant.com <http://www.merant.com>  
-----Original Message----- 
From: Peter Raymond [ mailto:Peter.Raymond@merant.com
<mailto:Peter.Raymond@merant.com> ] 
Sent: 27 September 2001 15:14 
To: Tim Ellison; ietf-dav-versioning@w3.org 
Subject: RE: Clarification on what exactly is captured in the Baseline Col
lect ion... 


Hi, 
Just to be clear, Tim, were you opting for option 1? eg: 



The confusion arises because it is not clearly stated in the spec. 
The pieces of text that confuse me most are: 
"Any nested collections that are needed to provide the 
appropriate name for a version-controlled member will be created" 
Makes it sound like a baseline collection will not contain all 
the collections, eg when you use BASELINE-CONTROL to populate 
a collection from a given baseline you need to parse the names 
of the VCRs and create any collection resources needed. 
Also the text that says: 
"In order to allow efficient baseline implementation, the state of a 
baseline of a collection is limited to be a set of versions and 
their names relative to the collection" 
Makes it sound like only bindings to versions are being captured, 
not bindings to other collections. 
-- 
Peter Raymond - MERANT 
Principal Architect (PVCS) 
Tel: +44 (0)1727 813362 
Fax: +44 (0)1727 869804 
mailto:Peter.Raymond@merant.com <mailto:Peter.Raymond@merant.com>  
WWW: http://www.merant.com <http://www.merant.com>  



-----Original Message----- 
From: Tim Ellison [ mailto:Tim_Ellison@uk.ibm.com
<mailto:Tim_Ellison@uk.ibm.com> ] 
Sent: 27 September 2001 14:31 
To: ietf-dav-versioning@w3.org 
Subject: Re: Clarification on what exactly is captured in the Baseline 
Collect ion... 



The baseline collection is deep, for example, it is the collection 
structure that you would see if you initialized a new workspace from that 
baseline. 
The confusion may have arisen since a 'baseline of a collection' (i.e., not 
a baseline-collection, <sigh>) is a non-collection resource.  Terminology 
confusion I think. 
Regards, 
Tim Ellison 
Java Technology Centre, MP146 
IBM UK Laboratory, Hursley Park, Winchester, UK. SO21 2JN 
tel: +44 (0)1962 819872  internal: 249872  MOBx: 270452 


 

                    Peter Raymond

                    <Peter.Raymond@merant.co       To:
ietf-dav-versioning@w3.org                        
                    m>                             cc:

                    Sent by:                       Subject:
Clarification on what exactly is captured in 
                    ietf-dav-versioning-requ        the Baseline Collect
ion...                             
                    est@w3.org

 

 

                    2001-09-27 10:50 AM

                    Please respond to Peter

                    Raymond

 

 







Hi, 
I thought I understood what was captured in the Baseline Collection (the 
collection which captures the state of the Baseline-Controlled Collection), 
but reading the spec in more detail with others in MERANT some seeds of 
doubt have been sown. 
Below is a detailed explanation, but I guess the basic question is, given: 
build 
  | 
  + include ---- globals.h 
Where build and include are collections and globals.h is a VCR. 
Does the Baseline Collection contain either: 
1) A binding to a collection where that collection contains a binding to a 
   VCR for globals.h. 
or 
2) One binding called "include/globals.h" which points to the VCR for 
globals.h. 
Is the Baseline Collection "deep" (containing collections and their 
members) or "shallow" 
does it only contain VCRs and have "multi-segment" bindings to indicate the 
presence 
of collections? 


Here is my analysis of the specification which shows this is 
ambiguous...... 
Section 12 says: 
       "In order to allow efficient baseline implementation, the state of a 
        baseline of a collection is limited to be a set of versions and 
their 
        names relative to the collection" 
Is it a set of versions or a set of VCRs pointing to versions?  I thought 
it was the 
latter.  Section 12.3.1 describes the members of the Baseline Collection to 
be VCRs 
not versions. 
In the postcondition DAV:select-existing-baseline it also talks about VCRs 
being 
created for each "version in the baseline", this gives the impression that 
versions 
(not VCRs) are captured by the baseline collection. 
Are the bindings to the VCRs in the Baseline Collection "multi-segment", eg 
build/src/gui/main.c or does the Baseline Collection capture the 
collections that 
were members of the original collection? 
We talk about the baseline capturing the state of the version-controlled 
members 
of a collection, but does it actually also capture the state of the 
collections 
that are in the configuration rooted at the baseline-controlled collection? 
I think the bindings are "multi-segment" and the Baseline Collection is 
"flat", 
the only hint to this is in the DAV:select-existing-baseline postcondition 
where it says that "Any nested collections that are needed to provide the 
appropriate name for a version-controlled member will be created", this 
hints 
that the baseline collection did not contain collections, it contained 
"multi-segment" bindings and now collections need to be created. 
But the DAV:create-new-baseline postcondition says: 
       "The DAV:baseline-collection of the new baseline MUST identify a 
        collection whose members have the same relative name and 
        DAV:checked-in version as the version-controlled members of the 
        request collection" 
This hints that the bindings are relative names (same as in the original 
collection). 
So I would say the specification is ambiguous.  If we can clarify this I 
will 
happily update the deltaV FAQ to include a good definition of the Baseline 
Collection. 
Regards, 
-- 
Peter Raymond - MERANT 
Principal Architect (PVCS) 
Tel: +44 (0)1727 813362 
Fax: +44 (0)1727 869804 
mailto:Peter.Raymond@merant.com <mailto:Peter.Raymond@merant.com>  
WWW: http://www.merant.com <http://www.merant.com>  
Received on Thursday, 27 September 2001 13:07:15 GMT

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