CAP 10: alarm-seq

[Bruce_Kahn@xxxxxxxxxxxxxxxx]

Gee, I think I need to stop comparing
my marked up draft 09 and just start afresh w/draft 10-12Jan2003.  In
doing some deeper reading for another topic I ran across something I find
added to iCalendar but not actually described in CAP.  In Section
2. Additions to
iCalendar there is:

These local alarms are not to be forwarded
to other CUs, CUAs, or CSs as are the "SEQUENCE" property and
the "ENABLE" parameter. So for the protocol between a CUA and
a CS, the following changes apply to the CAP protocol from [iCAL] section
4.6.6 page 67: 

  alarmc     = "BEGIN"
":" "VALARM" CRLF
                
       alarm-seq
               other-props
                
       (audioprop / dispprop / emailprop / procprop)
                
       "END" ":" "VALARM"
CRLF

 alarm-seq   = "SEQUENCE" alarmseqparams ":" posint
CRLF

alarmseqparams = other-params [";" local-param] other-params

               ; Where DIGIT is defined
in [iCAL]
               ;
 posint      = posintfirst 1*DIGIT

               ; A number starting with
1 through 9.
               ;
 posintfirst = %x31-39


I saw alarm-seq before but I never consciously
grokd the addition of it to VALARMs.  I find no discussion of this
in the WG archives.  Prior to CAP we sent all messages as full snapshots
so we did not have to consider just revising the VALARM (we would sequence
the containing VEVENT, etc instead and do whole substitutions).  So
now w/CAP we can just modify the VALARM on any particular component.  As
such Doug thoughtfully added alarm-seq to the spec.  

However I think that its not fully fleshed
out.  For example, when I first create a VALARM on a, say, VEVENT,
the SEQUENCE of it SHOULD be 0 to follow the existing schema.  This
is not possible given the ABNF above; the first value could only be 1 (or
higher) but never 0.  Why make SEQUENCE on VALARMs different from
all other components?  I say just use the same prose/logic from 2445
and call it a day.

Bruce
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Bruce Kahn                  
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