Re: [ietf-caldav] draft-daboo-webdav-sync-01

[Arnaud Quillaud <[e-mail]>]

Roberto Polli wrote:
> On martedì 10 marzo 2009 15:50:29 you wrote:
>   
>> Note that the current spec is a generic webdav spec.
>>     
> you mean the target is about fasten webdav sync and not caldav one?
>
>   
Given that caldav is based on webdav, this spec applies to both (and to 
any other webdav based protocol e.g. CardDAV).
>> You want to get deleted items separately from other changes?
>>     
> yes. I know the issue is quite complex. Afaik sync process needs at least 3 
> methods:
> 1- get new items since last sync
> 2- get updated items since last sync
> 3- get deleted items since last sync
>
>   
The current spec gives you all 3, except that there is only one method 
(see http://tools.ietf.org/html/draft-daboo-webdav-sync-01#section-4.2):

<<

      The DAV:status element in each DAV:sync-response element is used
      to indicate how the resource may have changed:

         A status code of '201 Created' is used to indicate resources
         that are new.

         A status code of '200 OK' is used to indicate resources that
         have changed.

         A status code of '404 Not Found' is used to indicate resources
         that have been removed.

 >>


>> For CalDAV we would
>> need to write an extension that would allow a time-range to be included in
>> the report
>>     
> I miss the point:
> * as of now we can find events by time-range with caldav for queries 1) and 2) 
> using CREATED|LAST-MOD
>   
Hmm, this is rather dangerous since those iCalendar properties are 
controlled by the client, not by the server.
> * as we lack a method for 3) we're forced to use etags mapping (and storing a 
> table on database with a history between syncs), thus retrieving all events 
> and retrieve deleted items by difference of sets (stored - retrieved).
> * retrieving deleted items directly from server will (partially) solve that 
> issue.. 
>   
I think the current spec returns exactly what you want.
> I wish this mail is not too confuse.
>
> Hope it helps+Peace,
> R.
>
>