Re: different calendar scales

Tim suggested on 09/23/2003 02:24:11 AM:
> I propose that CAP 10.7 be revised so that calscale-props is included as 
a 
> required response to the GET-CAPABILITY command, and that any 
> examples for GET-
> CAPABILITY be modified to show CALSCALE: GREGORIAN, HEBREW, JALALIL 
> CRLF (or a 
> similar list of calendar scales) being returned. 

Hmm, Mark didn't hop up and down on you for trying to make a change but 
then again noone seems to have responded (or Im missing WG traffic).   The 
suggestion has merit in that it would make adding support for 
non-GREGORIAN scales easy however adding to CAP is against the editors 
mantra. 

I like the idea but since there are currently no other calendar scales out 
there nor are there any proposals for any Im not sure there is sufficent 
need at this time.  Of course putting it in after the fact can be harder 
(imagine a CAP 1.0 client trying to use CAP to a HEBREW only CS...  Sucks 
to be that CU!)

There are 2 ways to approach this and neither cause any big delays in CAP. 
 

1: Simply add some text to Section 10.7 GET-CAPABILITY Command that says 
something like:

    For this version of CAP, both sides are assumed to support only the 
GREGORIAN calendar scale entries.  Entries in other calendar scales MUST 
NOT be sent to this version of a CAP implementation.

2: We can update CAP to actually return CALSCALE in the ABNF:

   cap-vreply     = "BEGIN" ":" "VCALENDAR" CRLF
                   ; The following properties may be in any order.
                   ;
                    prodid
                    version
                    reply-cmd
                    other-props
                    "BEGIN" ":" "VREPLY" CRLF
                    ; The following properties may be in any order.
                    ;
                    cap-version
                    calscale
                    car-level
                    components
                    stores-expanded
                    maxdate
                    mindate
                    itip-version
                    max-comp-size
                    multipart
                    query-level
                    recur-accepted
                    recur-expand
                    recur-limit
                    other-props
                    "END" ":" "VREPLY" CRLF
                   "END" ":" "VCALENDAR" CRLF

and then add some text to the command that says something like:

    The "GET-CAPABILITY" reply MUST include a CALSCALE property.  This 
indicates all the calendar scales which the sender understands.  Data that 
is not in one of those calendar scales MUST NOT be sent.

This would make the issue of a CAP 1.0 CUA talking to a HEBREW-only CS 
more easily detected and thus fail nicer ("The CS you are connecting only 
supports calendars in a scale I do not understand so I am unable to work 
with it.  Please upgrade me or use a different server.")

Bruce
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Bruce Kahn                                INet: 
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