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Subject: [Ietf-calsify] VFREEBUSY
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Hello everybody,

In Sec. 3.6.4. you can find the following about the properties dtend and
duration:

1. ABNF:

                   ; the following are OPTIONAL,
                   ; but MUST NOT occur more than once

                   ... / dtend / duration / ...

2. Text:

      In a free time request, these properties can be used
      in combination with the "DURATION" property to represent a request
      for a duration of free time within a specified window of time.


Is it intended that 'dtend' and 'duration' my both occur in a VFREEBUSY
component? Or shouldn't they be mutually exclusive?

Best Regards,

Oliver Block

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From ietf-calsify-bounces@osafoundation.org  Thu Jul  3 14:39:07 2008
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Subject: [Ietf-calsify] Duration Value Type
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Hello everybody,

I'd like to draw your attention to the following text:

      When computing an exact duration, the greatest order time
      components MUST be added first, that is, the number of weeks MUST
      be added first, followed by the number of days, number of hours,
      number of minutes, and number of seconds.

The syntax is defined as follows:

        dur-value  = (["+"] / "-") "P" (dur-date / dur-time / dur-week)

        dur-date   = dur-day [dur-time]
        dur-time   = "T" (dur-hour / dur-minute / dur-second)
        dur-week   = 1*DIGIT "W"
        dur-hour   = 1*DIGIT "H" [dur-minute]
        dur-minute = 1*DIGIT "M" [dur-second]
        dur-second = 1*DIGIT "S"
        dur-day    = 1*DIGIT "D"

As far as I've understood the meaning of RFC2445 (not the latest draft) 
and also of the syntax above, the use of week excludes the use of 
dur-date and also of dur-time. (I don't know if there is a need of a 
mixed form of in real life time planning.) So if you want to allow 
dur-week AND dur-date/dur-time within the same value, you need to change 
the ABNF to, for example

        dur-value  = (["+"] / "-") "P" [dur-week]  (dur-date / dur-time)

or for example

        dur-value  = (["+"] / "-") "P" (dur-date / dur-time / dur-week)
        ...
        dur-week   = 1*DIGIT "W" [dur-date]
        ...

If not, you need to change the text:

      When computing an exact duration, the greatest order time
      components MUST be added first, that is, the number of days MUST
      be added first, followed number of hours, number of minutes, and 
number
      of seconds.

Additionally there could be added an explicit statement if weeks and 
day/time are both to be used in a Duration value.


Do you agree?


Best Regards,

Oliver Block


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From ietf-calsify-bounces@osafoundation.org  Thu Jul  3 15:23:49 2008
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From: "Tim Hare" <TimHare@comcast.net>
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	<ietf-calsify@osafoundation.org>
Subject: RE: [Ietf-calsify] VFREEBUSY
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I believe DTSTART and DTEND specify the endpoints of the "specified window
of time" and DURATION the amount of time requested, in a free time request.

In English "I need to find an hour of your free time sometime between 11:00
on 07/03/20008 and 17:00 on 07/11/2008". 


Tim Hare
Interested Bystander, Non-Inc.

-----Original Message-----
From: ietf-calsify-bounces@osafoundation.org
[mailto:ietf-calsify-bounces@osafoundation.org] On Behalf Of Oliver Block
Sent: Friday, July 04, 2008 4:46 PM
To: ietf-calsify@osafoundation.org
Subject: [Ietf-calsify] VFREEBUSY

Hello everybody,

In Sec. 3.6.4. you can find the following about the properties dtend and
duration:

1. ABNF:

                   ; the following are OPTIONAL,
                   ; but MUST NOT occur more than once

                   ... / dtend / duration / ...

2. Text:

      In a free time request, these properties can be used
      in combination with the "DURATION" property to represent a request
      for a duration of free time within a specified window of time.


Is it intended that 'dtend' and 'duration' my both occur in a VFREEBUSY
component? Or shouldn't they be mutually exclusive?

Best Regards,

Oliver Block

_______________________________________________
Ietf-calsify mailing list
Ietf-calsify@osafoundation.org
http://lists.osafoundation.org/mailman/listinfo/ietf-calsify


_______________________________________________
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From ietf-calsify-bounces@osafoundation.org  Fri Jul  4 05:03:30 2008
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From: Oliver Block <lists@block-online.eu>
To: "Tim Hare" <TimHare@comcast.net>, ietf-calsify@osafoundation.org
Subject: Re: [Ietf-calsify] VFREEBUSY
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Am Freitag, 4. Juli 2008 00:23:28 schrieben Sie:
> I believe DTSTART and DTEND specify the endpoints of the "specified window
> of time" and DURATION the amount of time requested, in a free time request.
>
> In English "I need to find an hour of your free time sometime between 11:00
> on 07/03/20008 and 17:00 on 07/11/2008".

That's a good point. 

Best Regards,

Oliver Block
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Hi Oliver,

This is issue 67.

http://www.ofcourseimright.com/cgi-bin/roundup/calsify/issue67

Resolution is to disallow DURATION in VFREEBUSY components.
Check logs starting at [12:59:07]:

http://jabber.ietf.org/logs/calsify/2008-03-11.txt

Or the minutes of IETF71:

http://www.ietf.org/proceedings/08mar/minutes/calsify.txt

 > Consensus on issue 67 is to go with option a): Remove statement from
RFC2445bis.

Cheers,
Bernard

Oliver Block wrote:
> Am Freitag, 4. Juli 2008 00:23:28 schrieben Sie:
>> I believe DTSTART and DTEND specify the endpoints of the "specified window
>> of time" and DURATION the amount of time requested, in a free time request.
>>
>> In English "I need to find an hour of your free time sometime between 11:00
>> on 07/03/20008 and 17:00 on 07/11/2008".
> 
> That's a good point. 
> 
> Best Regards,
> 
> Oliver Block
> _______________________________________________
> Ietf-calsify mailing list
> Ietf-calsify@osafoundation.org
> http://lists.osafoundation.org/mailman/listinfo/ietf-calsify
> 

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Oliver Block wrote:
> Hello everybody,
> 
> I'd like to draw your attention to the following text:
> 
>      When computing an exact duration, the greatest order time
>      components MUST be added first, that is, the number of weeks MUST
>      be added first, followed by the number of days, number of hours,
>      number of minutes, and number of seconds.
> 
> The syntax is defined as follows:
> 
>        dur-value  = (["+"] / "-") "P" (dur-date / dur-time / dur-week)
> 
>        dur-date   = dur-day [dur-time]
>        dur-time   = "T" (dur-hour / dur-minute / dur-second)
>        dur-week   = 1*DIGIT "W"
>        dur-hour   = 1*DIGIT "H" [dur-minute]
>        dur-minute = 1*DIGIT "M" [dur-second]
>        dur-second = 1*DIGIT "S"
>        dur-day    = 1*DIGIT "D"
> 
> As far as I've understood the meaning of RFC2445 (not the latest draft) 
> and also of the syntax above, the use of week excludes the use of 
> dur-date and also of dur-time. (I don't know if there is a need of a 
> mixed form of in real life time planning.) So if you want to allow 
> dur-week AND dur-date/dur-time within the same value, you need to change 
> the ABNF to, for example
> 
>        dur-value  = (["+"] / "-") "P" [dur-week]  (dur-date / dur-time)
> 
> or for example
> 
>        dur-value  = (["+"] / "-") "P" (dur-date / dur-time / dur-week)
>        ...
>        dur-week   = 1*DIGIT "W" [dur-date]
>        ...
> 
> If not, you need to change the text:
> 
>      When computing an exact duration, the greatest order time
>      components MUST be added first, that is, the number of days MUST
>      be added first, followed number of hours, number of minutes, and 
> number
>      of seconds.

+1

Good catch.

Thanks,
Bernard

> 
> Additionally there could be added an explicit statement if weeks and 
> day/time are both to be used in a Duration value.
> 
> 
> Do you agree?
> 
> 
> Best Regards,
> 
> Oliver Block
> 
> 
> _______________________________________________
> Ietf-calsify mailing list
> Ietf-calsify@osafoundation.org
> http://lists.osafoundation.org/mailman/listinfo/ietf-calsify
> 

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References: <1F85ABB9-62D3-4AB6-8F1D-D3B4507806A8@osafoundation.org>	<1213599798.9973.124.camel@little.research.nokia.com>	<1213610174.9973.136.camel@little.research.nokia.com>	<8838196F-017B-4780-B182-CFF3E37FFCDF@osafoundation.org>	<1214218197.9973.325.camel@little.research.nokia.com>
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Subject: [Ietf-calsify] Re: AD review issue #1: Use of ALTREP
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I don't believe the current proposal is appropriate.

As it stands, the draft (RFC2445 as well) makes it clear that ALTREP is 
only allowed on 6 specific text properties, that is, COMMENT, 
DESCRIPTION, LOCATION, RESOURCES, SUMMARY, and CONTACT. I also believe 
the meaning of ALTREP is already properly defined.

In practice though, I'm not sure there is a single calendar user agent 
that exposes it (i.e., allow an end user to set its value, or make use 
of it).

Finally, the following search on the web will only report two iCalendar 
objects that makes use of ALTREP!

http://www.google.com/search?q=ALTREP+filetype%3Aics

In the past we've discussed limiting the URI schemes allowed for 
CAL-ADDRESS but never got around to it.  Perhaps we should limit the URI 
schemed allowed both for ALTREP and CAL-ADDRESS (two sets) while we're 
at it.

On the other hand, when applications while actually start making use of 
ALTREP, I suspect the media type of the resource being pointed at might 
be the real interop issue (e.g., http URL pointing to an XHTML, HTML, 
PDF, PNG, or JPG document).

Cheers,
Bernard

Eliot Lear wrote:
> Am I correct in that this issue is to be resolved as below?  Are there 
> any objections?
> 
> Eliot
> 
> Lisa Dusseault wrote:
>>
>> On Jun 23, 2008, at 3:49 AM, Aki Niemi wrote:
>>
>>> May I suggest an alternative approach? Since the list of "known" uses of
>>> ALTREP can actually be narrowed down to about three, I think we should
>>> add to the definition of each of these properties exactly what it means
>>> to receive one with the ALTREP parameter that contains an HTTP URL.
>>> Other URIs permitted, but their meaning is undefined. In other words,
>>> document current practice as much as we can, but keep further uses open.
>>>
>>> And then to ALTREP parameter, add the description you propose, as
>>> generic advice to how the parameter should be handled/used.
>>
>> +1
>> _______________________________________________
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> 
> 

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Subject: [Ietf-calsify] Re: AD review issue #2: DIR parameter
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Cyrus Daboo wrote:
> Hi Aki,
> 
> --On June 16, 2008 12:59:12 PM +0300 Aki Niemi <aki.niemi@nokia.com> wrote:
> 
>>> > Section 3.2.6, DIR parameter:  This should be limited to LDAP URLs
>>> > only, if not by requirement then at least by noting that other types
>>> > of URLs are likely to be harmful to interoperability.
>>
>> For maximum interoperability, a mandatory-to-implement choice should be
>> defined. However, is LDAP even widely enough supported in iCalendar
>> implementations to justify this? I suspect vCardDAV URLs could in the
>> future start appearing here as well.
> 
> I think at the very least HTTP/HTTPS needs to be allowed as well.
> 

cid and mid would be needed in the context of iMIP.

Here's a proposal for the mandatory-to-implement:

cid
data (e.g., to embed vCard directly?)
file
ftp
http
https
ldap
mid

Cheers,
Bernard
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Subject: Re: AD review issue #3: Meaning of RELTYPE parameter value of SIBLING
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While I was about to propose that we deprecate SIBLING I found cases 
where it might be handy in the future...

1- Group multiple to-dos that don't have a parent to-do. Not a very 
important use cases I think...

2- When breaking an unbounded recurring events in two events (i.e., the 
truncated unbounded recurring events for past recurrence instances, and 
a new unbounded recurring event for the "new" future recurrence 
instances), it might be useful to link the events together with this 
relationship.

Cheers,
Bernard

Aki Niemi wrote:
> ma, 2008-06-16 kello 10:03 +0300, ext Aki Niemi kirjoitti:
>>> Section 3.2.15: RELTYPE.  What does it mean that a calendar component  
>>> referenced is the SIBLING of this one?  How is a user agent supposed  
>>> to use this information?  Is this parameter ever used except on  
>>> RELATED-TO?  Is it actually in use even there?  Health warnings at  
>>> least.
> 
> Good question. Is there a use case that requires a relationship beyond
> parent-child (which currently is the only *defined* relationship in the
> document anyway)?
> 
> Cheers,
> Aki
> 
> _______________________________________________
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Subject: Re: AD review issue #4: Supporting both VTODO and VEVENT in	thesame
	iCalendar stream (was: Re: [Ietf-calsify] Re: AD review	on2445bis)
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It's not clear to me what Lisa is suggesting actually.

a) Warning about the fact that components type can be mixed?
b) Not to ignore unsupported component types silently?

Proposed text would be great!

Things that should be noted:

1- iTIP does not allow different component types to be mixed.

2- CalDAV provides means to get only the components types that you want.

As such, in practice we will only see mixed component types in export 
scenarios and Internet calendars (aka, webcal).

Cheers,
Bernard

Eliot Lear wrote:
> I believe we have consensus as to Lisa's suggestion.  Any disagreement?
> 
> Eliot
> 
> Tim Hare wrote:
>> As an "informed user" - i.e. not a developer, I definitely support
>> NON-silent rejection.  I can agree with non-support of certain components
>> only if I receive some notification;  due to work requirements I am now
>> journalling my time on some projects, and it would be good to know if I
>> can't import that data into another tool.
>>
>>
>> Tim Hare
>> Interested Bystander, Non-Inc.
>>
>> -----Original Message-----
>> From: ietf-calsify-bounces@osafoundation.org
>> [mailto:ietf-calsify-bounces@osafoundation.org] On Behalf Of Cyrus Daboo
>> Sent: Monday, June 16, 2008 12:33 PM
>> To: Lisa Dusseault
>> Cc: ietf-calsify@osafoundation.org; Bernard Desruisseaux
>> Subject: Re: AD review issue #4: Supporting both VTODO and VEVENT in 
>> thesame
>> iCalendar stream (was: Re: [Ietf-calsify] Re: AD review on2445bis)
>>
>> Hi Lisa,
>>
>> --On June 16, 2008 9:25:14 AM -0700 Lisa 
>> Dusseault<lisa@osafoundation.org>
>> wrote:
>>
>>   
>>>> The suggestion of an implementation note that describes the "common
>>>> use" of the components and explains that some may be supported and
>>>> others not is fine. In fact telling implementors that they need to be
>>>> prepared for another system to reject a component would be good.
>>>>        
>>> I can get behind that.  I'd also like to recommend that systems not
>>> reject a component silently -- a user needs to know if they imported a
>>> iCalendar file and lost 50 VJOURNAL components in the process.
>>>      
>>
>> Agreed.
>>
>> Note that iTIP does have a status code for "Unsupported Component" 
>> (3.13) -
>> so informing the originator of the iCalendar data that they are sending
>> something that is not supported by the recipient is covered by that.
>>
>> -- 
>> Cyrus Daboo
>>
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From: "Tim Hare" <TimHare@comcast.net>
To: "'Bernard Desruisseaux'" <bernard.desruisseaux@oracle.com>,
	"'Eliot Lear'" <lear@cisco.com>
Subject: RE: AD review issue #4: Supporting both VTODO and VEVENT in	thesame
	iCalendar stream (was: Re: [Ietf-calsify] Re: AD review	on2445bis)
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I can't speak for Lisa, but the export/import scenario is one place where b)
applies.  If by "Internet calendar" you mean an .ics file that is opened via
browser, that is also an 'import' scenario I think. 


Tim Hare
Interested Bystander, Non-Inc.

-----Original Message-----
From: Bernard Desruisseaux [mailto:bernard.desruisseaux@oracle.com] 
Sent: Friday, July 04, 2008 11:06 AM
To: Eliot Lear
Cc: Tim Hare; ietf-calsify@osafoundation.org
Subject: Re: AD review issue #4: Supporting both VTODO and VEVENT in thesame
iCalendar stream (was: Re: [Ietf-calsify] Re: AD review on2445bis)

It's not clear to me what Lisa is suggesting actually.

a) Warning about the fact that components type can be mixed?
b) Not to ignore unsupported component types silently?

Proposed text would be great!

Things that should be noted:

1- iTIP does not allow different component types to be mixed.

2- CalDAV provides means to get only the components types that you want.

As such, in practice we will only see mixed component types in export
scenarios and Internet calendars (aka, webcal).

Cheers,
Bernard

Eliot Lear wrote:
> I believe we have consensus as to Lisa's suggestion.  Any disagreement?
> 
> Eliot
> 
> Tim Hare wrote:
>> As an "informed user" - i.e. not a developer, I definitely support 
>> NON-silent rejection.  I can agree with non-support of certain 
>> components only if I receive some notification;  due to work 
>> requirements I am now journalling my time on some projects, and it 
>> would be good to know if I can't import that data into another tool.
>>
>>
>> Tim Hare
>> Interested Bystander, Non-Inc.
>>
>> -----Original Message-----
>> From: ietf-calsify-bounces@osafoundation.org
>> [mailto:ietf-calsify-bounces@osafoundation.org] On Behalf Of Cyrus 
>> Daboo
>> Sent: Monday, June 16, 2008 12:33 PM
>> To: Lisa Dusseault
>> Cc: ietf-calsify@osafoundation.org; Bernard Desruisseaux
>> Subject: Re: AD review issue #4: Supporting both VTODO and VEVENT in 
>> thesame iCalendar stream (was: Re: [Ietf-calsify] Re: AD review 
>> on2445bis)
>>
>> Hi Lisa,
>>
>> --On June 16, 2008 9:25:14 AM -0700 Lisa 
>> Dusseault<lisa@osafoundation.org>
>> wrote:
>>
>>   
>>>> The suggestion of an implementation note that describes the "common 
>>>> use" of the components and explains that some may be supported and 
>>>> others not is fine. In fact telling implementors that they need to 
>>>> be prepared for another system to reject a component would be good.
>>>>        
>>> I can get behind that.  I'd also like to recommend that systems not 
>>> reject a component silently -- a user needs to know if they imported 
>>> a iCalendar file and lost 50 VJOURNAL components in the process.
>>>      
>>
>> Agreed.
>>
>> Note that iTIP does have a status code for "Unsupported Component" 
>> (3.13) -
>> so informing the originator of the iCalendar data that they are 
>> sending something that is not supported by the recipient is covered by
that.
>>
>> --
>> Cyrus Daboo
>>
>> _______________________________________________
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>> Ietf-calsify@osafoundation.org
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>>    
> 
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To: Bernard Desruisseaux <bernard.desruisseaux@oracle.com>
Subject: Re: [Ietf-calsify] Re: AD review issue #1: Use of ALTREP
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Notes uses it on Description and Comment.



From:
Bernard Desruisseaux <bernard.desruisseaux@oracle.com>
To:
Eliot Lear <lear@cisco.com>
Cc:
"ietf-calsify@osafoundation.org" <ietf-calsify@osafoundation.org>
Date:
07/04/2008 09:56 AM
Subject:
[Ietf-calsify] Re: AD review issue #1: Use of ALTREP
Sent by:
ietf-calsify-bounces@osafoundation.org



I don't believe the current proposal is appropriate.

As it stands, the draft (RFC2445 as well) makes it clear that ALTREP is=20
only allowed on 6 specific text properties, that is, COMMENT,=20
DESCRIPTION, LOCATION, RESOURCES, SUMMARY, and CONTACT. I also believe=20
the meaning of ALTREP is already properly defined.

In practice though, I'm not sure there is a single calendar user agent=20
that exposes it (i.e., allow an end user to set its value, or make use=20
of it).

Finally, the following search on the web will only report two iCalendar=20
objects that makes use of ALTREP!

http://www.google.com/search?q=3DALTREP+filetype%3Aics

In the past we've discussed limiting the URI schemes allowed for=20
CAL-ADDRESS but never got around to it.  Perhaps we should limit the URI=20
schemed allowed both for ALTREP and CAL-ADDRESS (two sets) while we're=20
at it.

On the other hand, when applications while actually start making use of=20
ALTREP, I suspect the media type of the resource being pointed at might=20
be the real interop issue (e.g., http URL pointing to an XHTML, HTML,=20
PDF, PNG, or JPG document).

Cheers,
Bernard

Eliot Lear wrote:
> Am I correct in that this issue is to be resolved as below?  Are there=20
> any objections?
>=20
> Eliot
>=20
> Lisa Dusseault wrote:
>>
>> On Jun 23, 2008, at 3:49 AM, Aki Niemi wrote:
>>
>>> May I suggest an alternative approach? Since the list of "known" uses=20
of
>>> ALTREP can actually be narrowed down to about three, I think we should
>>> add to the definition of each of these properties exactly what it=20
means
>>> to receive one with the ALTREP parameter that contains an HTTP URL.
>>> Other URIs permitted, but their meaning is undefined. In other words,
>>> document current practice as much as we can, but keep further uses=20
open.
>>>
>>> And then to ALTREP parameter, add the description you propose, as
>>> generic advice to how the parameter should be handled/used.
>>
>> +1
>> =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F
>> Ietf-calsify mailing list
>> Ietf-calsify@osafoundation.org
>> http://lists.osafoundation.org/mailman/listinfo/ietf-calsify
>>
>=20
>=20

=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F
Ietf-calsify mailing list
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<br><font size=3D2 face=3D"sans-serif">Notes uses it on Description and Com=
ment.</font><br><br><br><table width=3D100%><tr valign=3Dtop><td><font size=
=3D1 color=3D#5f5f5f face=3D"sans-serif">From:</font><td><font size=3D1 fac=
e=3D"sans-serif">Bernard Desruisseaux &lt;bernard.desruisseaux@oracle.com&g=
t;</font><tr valign=3Dtop><td><font size=3D1 color=3D#5f5f5f face=3D"sans-s=
erif">To:</font><td><font size=3D1 face=3D"sans-serif">Eliot Lear &lt;lear@=
cisco.com&gt;</font><tr><td valign=3Dtop><font size=3D1 color=3D#5f5f5f fac=
e=3D"sans-serif">Cc:</font><td><font size=3D1 face=3D"sans-serif">&quot;iet=
f-calsify@osafoundation.org&quot;
&lt;ietf-calsify@osafoundation.org&gt;</font><tr valign=3Dtop><td><font siz=
e=3D1 color=3D#5f5f5f face=3D"sans-serif">Date:</font><td><font size=3D1 fa=
ce=3D"sans-serif">07/04/2008 09:56 AM</font><tr valign=3Dtop><td><font size=
=3D1 color=3D#5f5f5f face=3D"sans-serif">Subject:</font><td><font size=3D1 =
face=3D"sans-serif">[Ietf-calsify] Re: AD review issue #1:
Use of ALTREP</font><tr valign=3Dtop><td><font size=3D1 color=3D#5f5f5f fac=
e=3D"sans-serif">Sent by:</font><td><font size=3D1 face=3D"sans-serif">ietf=
-calsify-bounces@osafoundation.org</font></table><br><hr noshade><br><br><b=
r><tt><font size=3D2>I don't believe the current proposal is appropriate.<b=
r><br>As it stands, the draft (RFC2445 as well) makes it clear that ALTREP =
is
<br>only allowed on 6 specific text properties, that is, COMMENT, <br>DESCR=
IPTION, LOCATION, RESOURCES, SUMMARY, and CONTACT. I also believe
<br>the meaning of ALTREP is already properly defined.<br><br>In practice t=
hough, I'm not sure there is a single calendar user agent
<br>that exposes it (i.e., allow an end user to set its value, or make use
<br>of it).<br><br>Finally, the following search on the web will only repor=
t two iCalendar
<br>objects that makes use of ALTREP!<br><br></font></tt><a href=3D"http://=
www.google.com/search?q=3DALTREP+filetype%3Aics"><tt><font size=3D2>http://=
www.google.com/search?q=3DALTREP+filetype%3Aics</font></tt></a><tt><font si=
ze=3D2><br><br>In the past we've discussed limiting the URI schemes allowed=
 for <br>CAL-ADDRESS but never got around to it. &nbsp;Perhaps we should li=
mit the
URI <br>schemed allowed both for ALTREP and CAL-ADDRESS (two sets) while we=
're
<br>at it.<br><br>On the other hand, when applications while actually start=
 making use of
<br>ALTREP, I suspect the media type of the resource being pointed at might
<br>be the real interop issue (e.g., http URL pointing to an XHTML, HTML, <=
br>PDF, PNG, or JPG document).<br><br>Cheers,<br>Bernard<br><br>Eliot Lear =
wrote:<br>&gt; Am I correct in that this issue is to be resolved as below? =
&nbsp;Are
there <br>&gt; any objections?<br>&gt; <br>&gt; Eliot<br>&gt; <br>&gt; Lisa=
 Dusseault wrote:<br>&gt;&gt;<br>&gt;&gt; On Jun 23, 2008, at 3:49 AM, Aki =
Niemi wrote:<br>&gt;&gt;<br>&gt;&gt;&gt; May I suggest an alternative appro=
ach? Since the list of &quot;known&quot;
uses of<br>&gt;&gt;&gt; ALTREP can actually be narrowed down to about three=
, I think
we should<br>&gt;&gt;&gt; add to the definition of each of these properties=
 exactly
what it means<br>&gt;&gt;&gt; to receive one with the ALTREP parameter that=
 contains an
HTTP URL.<br>&gt;&gt;&gt; Other URIs permitted, but their meaning is undefi=
ned. In other
words,<br>&gt;&gt;&gt; document current practice as much as we can, but kee=
p further
uses open.<br>&gt;&gt;&gt;<br>&gt;&gt;&gt; And then to ALTREP parameter, ad=
d the description you propose,
as<br>&gt;&gt;&gt; generic advice to how the parameter should be handled/us=
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Date: Tue, 08 Jul 2008 16:43:36 -0400
From: Cyrus Daboo <cyrus@daboo.name>
To: ietf-calsify@osafoundation.org
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Subject: [Ietf-calsify] Why no empty calendar?
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Hi,
(Whilst I realize it is too late for changes to 2445bis now, I think it is 
still worth raising issues and using the issue tracker to log problems that 
could be considered in a future revision - assuming Eliot does not mind 
leaving the tracker up).

Currently both 2445 and 2445bis make it impossible to have an empty 
VCALENDAR object. i.e. a VCALENDAR with only properties - no components. 
The relevant ABNF is:

        icalbody   = calprops component


        component  = 1*(eventc / todoc / journalc / freebusyc /
                     timezonec / iana-comp / x-comp)

The workaround is to send a single VTIMEZONE object or a bogus X- component 
(perhaps BEGIN:X-2445-IS-SILLY), or a bogus "regular" component. But that 
seems a little silly. It should be perfectly possible for me to publish an 
empty calendar.

Proposal: relax the restriction that a VCALENDAR object has to contain "one 
or more" components, to instead allow "zero or more" components, and adjust 
ABNF and text accordingly.

-- 
Cyrus Daboo

_______________________________________________
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From ietf-calsify-bounces@osafoundation.org  Tue Jul  8 13:53:46 2008
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From: "Tim Hare" <TimHare@comcast.net>
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Subject: RE: [Ietf-calsify] Why no empty calendar?
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What's the use case for publishing an empty calendar?

Why would I want to open that file, assuming I found it using some sort of
calendar search? 

If this _were_ allowed in some future revision, then I would vote that a UA
MUST warn that the file is empty when opened. No one wants to open an .ics
file (say for example the schedule for the Irish National Hurling
Championships) to add something to their calendar, get nothing added, and
not be informed.  It's already sometimes onerous when a UA opens a calendar
file _with_ data but doesn't position you to, or tell you about, the first
item added - you then end up hunting through calendar entries to make sure
what you thought would happened did in fact happen.


Tim Hare
Interested Bystander, Non-Inc.

-----Original Message-----
From: ietf-calsify-bounces@osafoundation.org
[mailto:ietf-calsify-bounces@osafoundation.org] On Behalf Of Cyrus Daboo
Sent: Tuesday, July 08, 2008 4:44 PM
To: ietf-calsify@osafoundation.org
Subject: [Ietf-calsify] Why no empty calendar?

Hi,
(Whilst I realize it is too late for changes to 2445bis now, I think it is
still worth raising issues and using the issue tracker to log problems that
could be considered in a future revision - assuming Eliot does not mind
leaving the tracker up).

Currently both 2445 and 2445bis make it impossible to have an empty
VCALENDAR object. i.e. a VCALENDAR with only properties - no components. 
The relevant ABNF is:

        icalbody   = calprops component


        component  = 1*(eventc / todoc / journalc / freebusyc /
                     timezonec / iana-comp / x-comp)

The workaround is to send a single VTIMEZONE object or a bogus X- component
(perhaps BEGIN:X-2445-IS-SILLY), or a bogus "regular" component. But that
seems a little silly. It should be perfectly possible for me to publish an
empty calendar.

Proposal: relax the restriction that a VCALENDAR object has to contain "one
or more" components, to instead allow "zero or more" components, and adjust
ABNF and text accordingly.

--
Cyrus Daboo

_______________________________________________
Ietf-calsify mailing list
Ietf-calsify@osafoundation.org
http://lists.osafoundation.org/mailman/listinfo/ietf-calsify


_______________________________________________
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Ietf-calsify@osafoundation.org
http://lists.osafoundation.org/mailman/listinfo/ietf-calsify


From ietf-calsify-bounces@osafoundation.org  Tue Jul  8 14:04:56 2008
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Date: Tue, 08 Jul 2008 17:04:51 -0400
From: Cyrus Daboo <cyrus@daboo.name>
To: Tim Hare <TimHare@comcast.net>, ietf-calsify@osafoundation.org
Subject: RE: [Ietf-calsify] Why no empty calendar?
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Hi Tim,

--On July 8, 2008 4:53:42 PM -0400 Tim Hare <TimHare@comcast.net> wrote:

> What's the use case for publishing an empty calendar?
>
> Why would I want to open that file, assuming I found it using some sort of
> calendar search?

I create a new calendar on my web calendar system that exposes the calendar 
data as an .ics file (e.g. webcal://).

I can send out the subscription URL before events are added (perhaps I am 
not the one who will add events, I might be the system admin and only 
tasked with creating calendars for other people who will author them).

You want that file because at some point it will have events in it and your 
client will poll and pick those up.

-- 
Cyrus Daboo

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From: Helge Hess <helge.hess@opengroupware.org>
To: "Tim Hare" <TimHare@comcast.net>
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Subject: Re: [Ietf-calsify] Why no empty calendar?
Date: Tue, 8 Jul 2008 23:09:54 +0200
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+1, makes sense to me.

On 08.07.2008, at 22:53, Tim Hare wrote:
> What's the use case for publishing an empty calendar?
>
> Why would I want to open that file, assuming I found it using some  
> sort of
> calendar search?

You do not 'open' the 'file', you subscribe it. While it may not  
contain events now, it might contain some in the future.

Using the transport layer for this (eg HTTP 404) is not that good. The  
calendar actually exists and is valid, its just empty at a specific  
point in time.
The only other option might be to return an empty resource (content- 
length: 0). But then the calendar component itself might have  
interesting meta data.

Thanks,
   Helge

PS: I'm pretty sure that most iCal tools already work that way ...
-- 
Helge Hess
http://helgehess.eu/
_______________________________________________
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From: "Tim Hare" <TimHare@comcast.net>
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Subject: RE: [Ietf-calsify] Why no empty calendar?
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OK I understand the use case now; so my only statement will be that any UA
which processes the file (please note, you do not have to subscribe to it,
it's perfectly OK to reference an .ics file via an anchor tag and href
attribute, with a file association which causes it to be opened by a
particular desktop program) MUST warn that it is empty.

 


Tim Hare
Interested Bystander, Non-Inc.

-----Original Message-----
From: Helge Hess [mailto:helge.hess@opengroupware.org] 
Sent: Tuesday, July 08, 2008 5:10 PM
To: Tim Hare
Cc: 'Cyrus Daboo'; ietf-calsify@osafoundation.org
Subject: Re: [Ietf-calsify] Why no empty calendar?

+1, makes sense to me.

On 08.07.2008, at 22:53, Tim Hare wrote:
> What's the use case for publishing an empty calendar?
>
> Why would I want to open that file, assuming I found it using some 
> sort of calendar search?

You do not 'open' the 'file', you subscribe it. While it may not contain
events now, it might contain some in the future.

Using the transport layer for this (eg HTTP 404) is not that good. The
calendar actually exists and is valid, its just empty at a specific point in
time.
The only other option might be to return an empty resource (content-
length: 0). But then the calendar component itself might have interesting
meta data.

Thanks,
   Helge

PS: I'm pretty sure that most iCal tools already work that way ...
--
Helge Hess
http://helgehess.eu/


_______________________________________________
Ietf-calsify mailing list
Ietf-calsify@osafoundation.org
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From: Reinhold Kainhofer <reinhold@kainhofer.com>
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Subject: Re: [Ietf-calsify] Why no empty calendar?
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Am Dienstag, 8. Juli 2008 schrieb Tim Hare:
> OK I understand the use case now; so my only statement will be that any UA
> which processes the file (please note, you do not have to subscribe to it,
> it's perfectly OK to reference an .ics file via an anchor tag and href
> attribute, with a file association which causes it to be opened by a
> particular desktop program) MUST warn that it is empty.

I don't think that should really be a MUST. If I add a remote calendar file 
(i.e. a URL that will be regularly polled) to my personal organizer, I simply 
want its events to be displayed in my UA. I don't want to be bothered 
with "WARNING: The calendar blahblah does not contain any events!" messages 
whenever the application polls the calendar.

Of course, there are situations where a warning makes sense, but in other 
situations it is simply annoying to the user.

Cheers,
Reinhold


- -- 
- ------------------------------------------------------------------
Reinhold Kainhofer, Vienna University of Technology, Austria
email: reinhold@kainhofer.com, http://reinhold.kainhofer.com/
 * Financial and Actuarial Mathematics, TU Wien, http://www.fam.tuwien.ac.at/
 * K Desktop Environment, http://www.kde.org, KOrganizer maintainer
 * Chorvereinigung "Jung-Wien", http://www.jung-wien.at/
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.6 (GNU/Linux)

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From: "Tim Hare" <TimHare@comcast.net>
To: "'Reinhold Kainhofer'" <reinhold@kainhofer.com>,
	<ietf-calsify@osafoundation.org>
Subject: RE: [Ietf-calsify] Why no empty calendar?
Date: Tue, 8 Jul 2008 21:12:36 -0400
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When you're discussing polling, you're in the realm of Atom or RSS and
subscriptions, where eliminating the error message is "natural" - my RSS
reader doesn't tell me when the feed has not been updated. If, however we
allow VCALENDARs to be empty, a UA which imports a calendar through
mechanisms other than a subscription definitely needs to warn the user. 

I'll have to think more deeply on this; perhaps there needs to be an iTIP- /
iMIP- document to describe behaviors when iCalendar objects are consumed in
ways other than mail, CalDAV, or subscriptions?


Tim Hare
Interested Bystander, Non-Inc.

-----Original Message-----
From: Reinhold Kainhofer [mailto:reinhold@kainhofer.com] 
Sent: Tuesday, July 08, 2008 5:57 PM
To: ietf-calsify@osafoundation.org
Cc: Tim Hare; 'Helge Hess'
Subject: Re: [Ietf-calsify] Why no empty calendar?

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Am Dienstag, 8. Juli 2008 schrieb Tim Hare:
> OK I understand the use case now; so my only statement will be that 
> any UA which processes the file (please note, you do not have to 
> subscribe to it, it's perfectly OK to reference an .ics file via an 
> anchor tag and href attribute, with a file association which causes it 
> to be opened by a particular desktop program) MUST warn that it is empty.

I don't think that should really be a MUST. If I add a remote calendar file
(i.e. a URL that will be regularly polled) to my personal organizer, I
simply want its events to be displayed in my UA. I don't want to be bothered
with "WARNING: The calendar blahblah does not contain any events!" messages
whenever the application polls the calendar.

Of course, there are situations where a warning makes sense, but in other
situations it is simply annoying to the user.

Cheers,
Reinhold


- --
- ------------------------------------------------------------------
Reinhold Kainhofer, Vienna University of Technology, Austria
email: reinhold@kainhofer.com, http://reinhold.kainhofer.com/
 * Financial and Actuarial Mathematics, TU Wien,
http://www.fam.tuwien.ac.at/
 * K Desktop Environment, http://www.kde.org, KOrganizer maintainer
 * Chorvereinigung "Jung-Wien", http://www.jung-wien.at/ -----BEGIN PGP
SIGNATURE-----
Version: GnuPG v1.4.6 (GNU/Linux)

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-----END PGP SIGNATURE-----


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Subject: [Ietf-calsify] Question about etag support for freebusy report
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Hi.

Strong Etags must be supported by CS, as by RFC 4791.

Any report method, like freebusy reports, normally do not provide etags.

Â¿Correct?

Thanx.
Erny
Yaco Sistemas
Spain

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Subject: Re: [Ietf-calsify] Question about etag support for freebusy report
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On 11.07.2008, at 11:58, Ernesto Revilla wrote:
> Strong Etags must be supported by CS, as by RFC 4791.
>
> Any report method, like freebusy reports, normally do not provide =20
> etags.
>
> =BFCorrect?


Yes.

Greets,
   Helge
--=20
Helge Hess
http://helgehess.eu/=
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
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	Title           : iCalendar Transport-Independent Interoperability Protocol (iTIP)
	Author(s)       : C. Daboo
	Filename        : draft-ietf-calsify-2446bis-07.txt
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Thank you, Cyrus, for this update that contains IANA Considerations and 
an updated Appendix of changes.

Eliot

Internet-Drafts@ietf.org wrote:
> A New Internet-Draft is available from the on-line Internet-Drafts directories.
> This draft is a work item of the Calendaring and Scheduling Standards Simplification Working Group of the IETF.
>
>
> 	Title           : iCalendar Transport-Independent Interoperability Protocol (iTIP)
> 	Author(s)       : C. Daboo
> 	Filename        : draft-ietf-calsify-2446bis-07.txt
> 	Pages           : 126
> 	Date            : 2008-07-14
>
> This document specifies a protocol using the iCalendar object
> specification to provide scheduling interoperability between
> different calendar systems.  This is done without reference to a
> specific transport protocol so as to allow multiple methods of
> communication between systems.  Subsequent documents will define
> profiles of this protocol using specific interoperable methods of
> communications between systems.
>
> iTIP complements the iCalendar object specification by adding
> semantics for group scheduling methods commonly available in current
> calendar systems.  These scheduling methods permit two or more
> calendar systems to perform transactions such as publish, schedule,
> reschedule, respond to scheduling requests, negotiation of changes or
> cancel.
>
> A URL for this Internet-Draft is:
> http://www.ietf.org/internet-drafts/draft-ietf-calsify-2446bis-07.txt
>
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
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Thank you, Cyrus, for this update that contains IANA Considerations and
an updated Appendix of changes.<br>
<br>
Eliot<br>
<br>
<a class="moz-txt-link-abbreviated" href="mailto:Internet-Drafts@ietf.org">Internet-Drafts@ietf.org</a> wrote:
<blockquote cite="mid:20080714181502.1C5F03A6A5C@core3.amsl.com"
 type="cite">
  <pre wrap="">A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Calendaring and Scheduling Standards Simplification Working Group of the IETF.


	Title           : iCalendar Transport-Independent Interoperability Protocol (iTIP)
	Author(s)       : C. Daboo
	Filename        : draft-ietf-calsify-2446bis-07.txt
	Pages           : 126
	Date            : 2008-07-14

This document specifies a protocol using the iCalendar object
specification to provide scheduling interoperability between
different calendar systems.  This is done without reference to a
specific transport protocol so as to allow multiple methods of
communication between systems.  Subsequent documents will define
profiles of this protocol using specific interoperable methods of
communications between systems.

iTIP complements the iCalendar object specification by adding
semantics for group scheduling methods commonly available in current
calendar systems.  These scheduling methods permit two or more
calendar systems to perform transactions such as publish, schedule,
reschedule, respond to scheduling requests, negotiation of changes or
cancel.

A URL for this Internet-Draft is:
<a class="moz-txt-link-freetext" href="http://www.ietf.org/internet-drafts/draft-ietf-calsify-2446bis-07.txt">http://www.ietf.org/internet-drafts/draft-ietf-calsify-2446bis-07.txt</a>

Internet-Drafts are also available by anonymous FTP at:
<a class="moz-txt-link-freetext" href="ftp://ftp.ietf.org/internet-drafts/">ftp://ftp.ietf.org/internet-drafts/</a>

Below is the data which will enable a MIME compliant mail reader
implementation to automatically retrieve the ASCII version of the
Internet-Draft.
  </pre>
  <pre wrap="">
<hr size="4" width="90%">
_______________________________________________
Ietf-calsify mailing list
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<a class="moz-txt-link-freetext" href="http://lists.osafoundation.org/mailman/listinfo/ietf-calsify">http://lists.osafoundation.org/mailman/listinfo/ietf-calsify</a>
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From ietf-calsify-bounces@osafoundation.org  Mon Jul 14 15:49:11 2008
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From: Lisa Dusseault <lisa@osafoundation.org>
To: Tim Hare <TimHare@comcast.net>
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Subject: Re: AD review issue #4: Supporting both VTODO and VEVENT in	thesame
	iCalendar stream (was: Re: [Ietf-calsify] Re: AD review	on2445bis)
Date: Mon, 14 Jul 2008 15:49:21 -0700
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Yes, it's the import scenarios I had in mind.  Even if it's not  
strictly Internet Engineering.

Off the top of my head, suggested text change that can certainly be  
improved upon, particularly the hand-wavy "other situations":

OLD:

    An iCalendar object MUST include the "PRODID" and "VERSION" calendar
    properties.  In addition, it MUST include at least one calendar
    component.  Special forms of iCalendar objects are possible to
    publish just busy time (i.e., only a "VFREEBUSY" calendar component)
    or time zone (i.e., only a "VTIMEZONE" calendar component)
    information.  In addition, a complex iCalendar object that is used  
to
    capture a complete snapshot of the contents of a calendar is  
possible
    (e.g., composite of many different calendar components).  More
    commonly, an iCalendar object will consist of just a single  
"VEVENT",
    "VTODO" or "VJOURNAL" calendar component.  Applications MUST ignore
    x-comp and iana-comp they don't recognized.

NEW:

    An iCalendar object MUST include the "PRODID" and "VERSION" calendar
    properties.  In addition, it MUST include at least one calendar
    component.   Applications MUST ignore
    x-comp and iana-comp they don't recognized.

	When iCalendar objects are sent out using iTIP, these usually
    consist of just a single "VEVENT", "VTODO" or "VJOURNAL" calendar
    component.  The recipient is expected to support any of these.  In  
other
    situtations, iCalendar objects may contain only a "VFREEBUSY"
    or "VTIMEZONE" calendar component.  Finally, complex iCalendar
    objects containing several different calendar components are used
    to capture a complete snapshot of the contents of a calendar, task  
list,
    project file or other application construct.

    Applications that support importing iCalendar objects SHOULD
    support all of the component types defined in this document, and
    SHOULD NOT silently drop any components as that can lead
    to user data loss.

Lisa

On Jul 4, 2008, at 1:17 PM, Tim Hare wrote:

> I can't speak for Lisa, but the export/import scenario is one place  
> where b)
> applies.  If by "Internet calendar" you mean an .ics file that is  
> opened via
> browser, that is also an 'import' scenario I think.
>
>
> Tim Hare
> Interested Bystander, Non-Inc.
>
> -----Original Message-----
> From: Bernard Desruisseaux [mailto:bernard.desruisseaux@oracle.com]
> Sent: Friday, July 04, 2008 11:06 AM
> To: Eliot Lear
> Cc: Tim Hare; ietf-calsify@osafoundation.org
> Subject: Re: AD review issue #4: Supporting both VTODO and VEVENT in  
> thesame
> iCalendar stream (was: Re: [Ietf-calsify] Re: AD review on2445bis)
>
> It's not clear to me what Lisa is suggesting actually.
>
> a) Warning about the fact that components type can be mixed?
> b) Not to ignore unsupported component types silently?
>
> Proposed text would be great!
>
> Things that should be noted:
>
> 1- iTIP does not allow different component types to be mixed.
>
> 2- CalDAV provides means to get only the components types that you  
> want.
>
> As such, in practice we will only see mixed component types in export
> scenarios and Internet calendars (aka, webcal).
>
> Cheers,
> Bernard
>
> Eliot Lear wrote:
>> I believe we have consensus as to Lisa's suggestion.  Any  
>> disagreement?
>>
>> Eliot
>>
>> Tim Hare wrote:
>>> As an "informed user" - i.e. not a developer, I definitely support
>>> NON-silent rejection.  I can agree with non-support of certain
>>> components only if I receive some notification;  due to work
>>> requirements I am now journalling my time on some projects, and it
>>> would be good to know if I can't import that data into another tool.
>>>
>>>
>>> Tim Hare
>>> Interested Bystander, Non-Inc.
>>>
>>> -----Original Message-----
>>> From: ietf-calsify-bounces@osafoundation.org
>>> [mailto:ietf-calsify-bounces@osafoundation.org] On Behalf Of Cyrus
>>> Daboo
>>> Sent: Monday, June 16, 2008 12:33 PM
>>> To: Lisa Dusseault
>>> Cc: ietf-calsify@osafoundation.org; Bernard Desruisseaux
>>> Subject: Re: AD review issue #4: Supporting both VTODO and VEVENT in
>>> thesame iCalendar stream (was: Re: [Ietf-calsify] Re: AD review
>>> on2445bis)
>>>
>>> Hi Lisa,
>>>
>>> --On June 16, 2008 9:25:14 AM -0700 Lisa
>>> Dusseault<lisa@osafoundation.org>
>>> wrote:
>>>
>>>
>>>>> The suggestion of an implementation note that describes the  
>>>>> "common
>>>>> use" of the components and explains that some may be supported and
>>>>> others not is fine. In fact telling implementors that they need to
>>>>> be prepared for another system to reject a component would be  
>>>>> good.
>>>>>
>>>> I can get behind that.  I'd also like to recommend that systems not
>>>> reject a component silently -- a user needs to know if they  
>>>> imported
>>>> a iCalendar file and lost 50 VJOURNAL components in the process.
>>>>
>>>
>>> Agreed.
>>>
>>> Note that iTIP does have a status code for "Unsupported Component"
>>> (3.13) -
>>> so informing the originator of the iCalendar data that they are
>>> sending something that is not supported by the recipient is  
>>> covered by
> that.
>>>
>>> --
>>> Cyrus Daboo
>>>
>>> _______________________________________________
>>> Ietf-calsify mailing list
>>> Ietf-calsify@osafoundation.org
>>> http://lists.osafoundation.org/mailman/listinfo/ietf-calsify
>>>
>>>
>>> _______________________________________________
>>> Ietf-calsify mailing list
>>> Ietf-calsify@osafoundation.org
>>> http://lists.osafoundation.org/mailman/listinfo/ietf-calsify
>>>
>>>
>>
>> _______________________________________________
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>>
>
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>
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Subject: Re: [Ietf-calsify] Why no empty calendar?
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On Jul 8, 2008, at 6:12 PM, Tim Hare wrote:

> When you're discussing polling, you're in the realm of Atom or RSS and
> subscriptions, where eliminating the error message is "natural" - my  
> RSS
> reader doesn't tell me when the feed has not been updated. If,  
> however we
> allow VCALENDARs to be empty, a UA which imports a calendar through
> mechanisms other than a subscription definitely needs to warn the  
> user.
>
> I'll have to think more deeply on this; perhaps there needs to be an  
> iTIP- /
> iMIP- document to describe behaviors when iCalendar objects are  
> consumed in
> ways other than mail, CalDAV, or subscriptions?

+1.  Actually I think the subscription case needs to be fleshed out too.

I drafted some text a little while back, that might have been a 2445  
appendix, but could instead get used in a separate doc.  This starts  
out as drafty text but then turns into somewhat of an outline.

Lisa

----

X.  Importing and exporting iCalendar Data

The iCalendar specification is commonly used as the basis for  
exporting calendar files that can be imported into different software  
when users need to move their calendars around. This document  
describes that practice.  It is intended to be descriptive rather than  
normative.

The file type and extension are as specified in RFC2445bis.

When a user has several calendars for different categories or contexts  
(such as "home", "work" and "local events"), user agents most commonly  
export these as separate files rather than using categories within one  
big file.  This works well with user agents that import each ICS file  
as a new calendar.  Another common practice is to name the export file  
after the calendar, e.g. "work.ics".

X.1. Components

All iCalendar components can be mixed in the same file.  VTIMEZONE  
components SHOULD be included in the same file where the timezone  
definitions are used.

X.1.1 VTODOs

Many, but not all clients, can handle importing VTODOs along with  
VEVENTS.  When the user maintains several different calendars for  
different contexts, the VTODOs are usually associated with the same  
contexts as the VEVENTs: (e.g. "home tasks" and "work tasks").  Thus,  
it's very convenient to export VTODOs in the same file as VEVENTS.    
However, there are still some calendar agents that don't handle tasks,  
and users might find their tasks disappearing or even confusing the  
importing piece of software.   It might be a useful feature to allow  
users the choice of including VTODOs in export files or leaving them  
out.

VTODOs can be recurring items, can have due dates and alarms. This  
should be supported, otherwise the user must be warned if information  
is being lost in import.

X.1.2 VJOURNALs

VJOURNAL components are even less consistently handled.   They are  
used in some time-management software to allow users to enter quick  
notes, that might turn into tasks or events or may simply be archived  
as plain notes.   However, when a user agent has no ability to display  
notes as separate components from calendar events, the user at least  
needs to be made aware that some types of components are not being  
preserved in the import.

Not all properties are routinely supported on VJOURNAL items.   
CONTACT, ORGANIZER, RECURRING, SEQUENCE  properties are not. ,.. what  
else?  Alarms... perhaps attachments should be recommended here, and  
most other things advised against.

X.2. Alarms

choice to clear all alarms when importing
default choice when exporting should be to include
how to convert to local context
how the ATTACH property points to a local file

importing client MUST be able to handle multiple alarms on the same  
parent component

X.3.  Attachments

How does this work anyway?  Is CID URL really used?  Where are the  
content parts stored, that are referenced?


X.4.  Other considerationsw

The FREEBUSY properties on an iCalendar object should be preserved in  
this way...

The METHOD property should not appear

The PRODID property can be dropped/changed on import, but should be  
saved on export for debugging information.

CATEGORIES are generally treated as keywords, either folksonomies or  
specific categories in some enterprise systems.  In either case,  
categories are not usually given top-level UI treatment -- instead,  
separate calendars (separate iCalendar files) are more commonly used  
as the model.

COMMENT properties are not common.  User agents may fold this into  
description during import.

How are invitations handled?  How can a user see, when they import an  
event into a new piece of software, that this was received as an  
invitation and from whom and when?

How often is RELATED-TO really used and what for?  Can a user agent  
drop this on import?

Y.  Security Considerations (to add to security considerations already  
there)

Respecting CLASS:private and confidential

---
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Subject: [Ietf-calsify] status of RFC 2445bis
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Lisa, Bernard, Aki, all:

I've held off sending this note because Bernard was on holiday last 
week.  Here is my understanding of the AD issues:

AD Issue 1:

A disagreement between Bernard and everyone else.  Bernard, rough 
consensus says that you should change the text accordingly.

AD Issue 2:

There needs to be a statement as to what URIs are allowed and how they 
are to be resolved (in the case of HTTP and HTTPs).

AD Issue 3:

Bernard has come up with what seems like sufficient grounds to leave 
things as they are in the draft.

AD Issue 4:

Bernard has requested text, but there is consensus that text is needed 
and we are currently blocking on that.

I would like to see this draft move forward quickly after IETF.  
Bernard, can you please address each issue in an update?

Thanks,

Eliot
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Lisa Dusseault had proposed some text:

>Yes, it's the import scenarios I had in mind.  Even if it's not strictly
Internet Engineering.
>
>Off the top of my head, suggested text change that can certainly be
improved upon, particularly the hand-wavy "other situations":
>
>OLD:
>
>    An iCalendar object MUST include the "PRODID" and "VERSION" calendar
>    properties.  In addition, it MUST include at least one calendar
>    component.  Special forms of iCalendar objects are possible to
>    publish just busy time (i.e., only a "VFREEBUSY" calendar component)
>    or time zone (i.e., only a "VTIMEZONE" calendar component)
>    information.  In addition, a complex iCalendar object that is used to
>    capture a complete snapshot of the contents of a calendar is possible
>    (e.g., composite of many different calendar components).  More
>    commonly, an iCalendar object will consist of just a single "VEVENT",
>    "VTODO" or "VJOURNAL" calendar component.  Applications MUST ignore
>    x-comp and iana-comp they don't recognized.
>
>NEW:
>
>    An iCalendar object MUST include the "PRODID" and "VERSION" calendar
>    properties.  In addition, it MUST include at least one calendar
>    component.   Applications MUST ignore
>    x-comp and iana-comp they don't recognized.
>
>	When iCalendar objects are sent out using iTIP, these usually
>    consist of just a single "VEVENT", "VTODO" or "VJOURNAL" calendar
>    component.  The recipient is expected to support any of these.  In
other
>    situtations, iCalendar objects may contain only a "VFREEBUSY"
>    or "VTIMEZONE" calendar component.  Finally, complex iCalendar
>    objects containing several different calendar components are used
>    to capture a complete snapshot of the contents of a calendar, task
list,
>    project file or other application construct.
>
>    Applications that support importing iCalendar objects SHOULD
>    support all of the component types defined in this document, and
>    SHOULD NOT silently drop any components as that can lead
>    to user data loss.

Bernard Desruisseaux had stated previously:

>Things that should be noted:
>
>1- iTIP does not allow different component types to be mixed.

I believe multiple component types should be allowed within ITIP for certain
METHOD: values, PUBLISH being the first that comes to mind, (although for
one of the use cases, moving the entire contents of a calendar, a new method
type  of TRANSPORT might be in order).

I would reword suggest slightly different wording for Lisa's last paragraph
(although this could use some work, too, I fear):

NEW:

Some applications provide a function to read iCalendar objects in a
non-scheduling context, for example to import a copy of a calendar which was
exported for backup. These applications SHOULD support iCalendar objects
which contain several different component types as long as the types are
valid component types defined in this document. Applications which import
iCalendar objects and  which do not process all of the component types in an
iCalendar object SHOULD inform the user that some components were ignored,
and SHOULD inform the user or create a log of which components were ignored.


Tim Hare
Interested Bystander, Non-Inc.

-----Original Message-----
From: ietf-calsify-bounces@osafoundation.org
[mailto:ietf-calsify-bounces@osafoundation.org] On Behalf Of Eliot Lear
Sent: Wednesday, July 23, 2008 8:24 AM
To: Bernard Desruisseaux; Lisa Dusseault; Aki Niemi;
ietf-calsify@osafoundation.org
Subject: [Ietf-calsify] status of RFC 2445bis

Lisa, Bernard, Aki, all:

I've held off sending this note because Bernard was on holiday last week.
Here is my understanding of the AD issues:

AD Issue 1:

A disagreement between Bernard and everyone else.  Bernard, rough consensus
says that you should change the text accordingly.

AD Issue 2:

There needs to be a statement as to what URIs are allowed and how they are
to be resolved (in the case of HTTP and HTTPs).

AD Issue 3:

Bernard has come up with what seems like sufficient grounds to leave things
as they are in the draft.

AD Issue 4:

Bernard has requested text, but there is consensus that text is needed and
we are currently blocking on that.

I would like to see this draft move forward quickly after IETF.  
Bernard, can you please address each issue in an update?

Thanks,

Eliot
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Subject: [Ietf-calsify] Relationship between STATUS,
	COMPLETED and PERCENT-COMPLETE
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Are there any implied semantics between STATUS, COMPLETED and
PERCENT-COMPLETE on VTODO? I'm trying to figure out the best way to
indicate status for a task that was performed but was unsuccessful.Is
the combination of STATUS NEEDS-ACTION and a COMPLETED date legal?
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Subject: [Ietf-calsify] we're not meeting this week, but..
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Dear all,

The Calsify WG is not meeting this week.  However, if you would like to 
talk to the chairs, both Aki and I will be available.  Also, we are 
organizing an unofficial social breakfast on Wednesday at 7:30am at the 
restaurant that offers breakfast ;-)  If you'd to join, please drop me a 
line.

All the best,

Eliot
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Subject: [Ietf-calsify] Registration Open for CalConnect XIII: Roundtable
 XIII and CalConnect
 Interoperability Test Event, October 6-10, 2008, Sunnyvale, California
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Registration is now open for CalConnect XIII comprised of Roundtable 
XIII and a CalConnect Interoperability Test Event*, hosted by 
Yahoo/Zimbra in Sunnyvale, California on October 6-10, 2008.

Please see http://www.calconnect.org/calconnect13.shtml for logistics 
information and links to registration for the Roundtable and for the 
CalConnect Interoperability Test Event*.

If you are considering participating in the CalConnect Interoperability 
Test Event*, note that it begins with breakfast on Monday morning the 
6th at 08:00 and runs to noon on Wednesday the 8th.  As usual the 
Roundtable will begin with lunch at 12:30 on Wednesday the 8th  and run 
until early Friday afternoon the 10th. 

A general schedule of events is provided on the logistics page; the 
final schedule of TC sessions, together with topical agendas, will be 
available by mid-September.

We will have a *Technology Preview* on Wednesday afternoon at 1600, 
demonstrating multiple clients and servers participating in Freebusy 
URL, CalDAV Scheduling, and iSCHEDULE server-server scheduling.  
(iSCHEDULE is the HTTP-based instance of iTIP being worked on by the 
iSCHEDULE Technical Committee.)

Hope to see you in Sunnyvale in October!

Cheers,

Dave Thewlis


*This CalConnect Interoperability Test Event will be a "regular" IOP 
test event.  The next MOBILE Calendaring Interoperability Test Event 
will be held in November - see 
http://www.calconnect.org/miop0811.shtml.  (The formal announcement of 
the Mobile IOP Test Event will be made soon.)

-- 
*Dave Thewlis, Executive Director
Calconnect - The Calendaring and Scheduling Consortium*
+1 707 840 9391 (voice) · +1 707 498 2238 (mobile)
http://www.calconnect.org · Dave.Thewlis@calconnect.org 
<mailto:Dave.Thewlis@calconnect.org>

--------------000702040005030103070209
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
</head>
<body bgcolor="#ffffff" text="#000000">
<br>
Registration is now open for CalConnect XIII comprised of Roundtable
XIII and
a CalConnect
Interoperability Test Event*, hosted by Yahoo/Zimbra in Sunnyvale,
California
on October 6-10, 2008.<br>
<br>
Please see&nbsp;<a href="http://www.calconnect.org/calconnect13.shtml">http://www.calconnect.org/calconnect13.shtml</a>
for logistics information and links to registration for the Roundtable
and for the CalConnect Interoperability Test Event*.<br>
<br>
If you are considering participating in the CalConnect Interoperability
Test Event*, note that it begins with breakfast on Monday morning the
6th at 08:00 and
runs to noon on Wednesday the 8th.&nbsp; As usual the Roundtable will begin
with lunch at 12:30 on Wednesday the 8th&nbsp; and run until early Friday
afternoon the 10th.&nbsp; <br>
<br>
A general schedule of events is provided on the logistics page; the
final schedule of TC sessions, together with topical agendas, will be
available by mid-September.<br>
<br>
We will have a <b>Technology Preview</b> on Wednesday
afternoon at 1600, demonstrating multiple clients and servers
participating in Freebusy URL, CalDAV Scheduling, and iSCHEDULE
server-server scheduling.&nbsp; (iSCHEDULE is the HTTP-based instance of
iTIP being worked on by the iSCHEDULE Technical Committee.)<br>
<br>
Hope to see you in Sunnyvale in October!<br>
<br>
Cheers,<br>
<br>
Dave Thewlis<br>
<br>
<br>
*This CalConnect Interoperability Test Event will be a "regular" IOP
test event.&nbsp; The next MOBILE Calendaring Interoperability Test Event
will be held in November - see <a
 href="http://www.calconnect.org/miop0811.shtml">http://www.calconnect.org/miop0811.shtml</a>.&nbsp;
(The formal announcement of the Mobile IOP Test Event will be made
soon.)<br>
<br>
<div class="moz-signature">-- <br>
<font size="-1"><b>Dave Thewlis, Executive Director<br>
Calconnect - The Calendaring and Scheduling Consortium</b><br>
+1 707 840 9391 (voice) &middot; +1 707 498 2238 (mobile)<br>
<a href="http://www.calconnect.org">http://www.calconnect.org</a> &middot; <a
 href="mailto:Dave.Thewlis@calconnect.org">Dave.Thewlis@calconnect.org</a>
</font></div>
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Date: Wed, 30 Jul 2008 10:07:31 -0700
From: Dave Thewlis <Dave.Thewlis@calconnect.org>
Organization: The Calendaring and Scheduling Consortium
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CalConnect has announced that its second Mobile Calendaring 
Interoperability Test Event will be a standalone event November 4-6, 
2008, hosted by Kerio Technologies in Plzen, Czech Republic, and 
registration is now open for the event. Several CalConnect members have 
indicated a distinct interest in or plan to participate. Logistics and 
registration information are available at 
http://www.calconnect.org/miop0811.shtml.  The press release announcing 
this event can be found at http://www.calconnect.org/publicity/080728 
CalConnect Mobile IOP Test Event.doc 
<http://www.calconnect.org/publicity/080728%20CalConnect%20Mobile%20IOP%20Test%20Event.doc>.  


As always, this event is open to members and non-members alike; however 
space will be somewhat limited and early registration is advisable.  If 
you have questions about the event, feel free to post to the 
calmobileiop-l list (you may join the list at 
http://www.calconnect.org/calmobileioplist.shtml if you are not already 
a member), or contact me at the e-mail below.

Hope to see you in Plzen!

Best Regards,

Dave Thewlis

-- 
*Dave Thewlis, Executive Director
Calconnect - The Calendaring and Scheduling Consortium*
+1 707 840 9391 (voice) · +1 707 498 2238 (mobile)
http://www.calconnect.org · Dave.Thewlis@calconnect.org 
<mailto:Dave.Thewlis@calconnect.org>

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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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</head>
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CalConnect has announced that its second Mobile Calendaring
Interoperability Test Event will be a standalone event November 4-6,
2008, hosted by Kerio Technologies in Plzen, Czech Republic, and
registration is now open for the event. Several CalConnect members have
indicated a distinct interest in or plan to participate. Logistics and
registration information are available at <a
 href="http://www.calconnect.org/miop0811.shtml">http://www.calconnect.org/miop0811.shtml</a>.&nbsp;
The press release announcing this event can be found at <a
 href="http://www.calconnect.org/publicity/080728%20CalConnect%20Mobile%20IOP%20Test%20Event.doc">http://www.calconnect.org/publicity/080728
CalConnect Mobile IOP Test Event.doc</a>.&nbsp; <br>
<br>
As always, this event is open to members and non-members alike; however
space will be somewhat limited and early registration is advisable.&nbsp; If
you
have questions about the event, feel free to post to the calmobileiop-l
list (you may join the list at <a
 href="http://www.calconnect.org/calmobileioplist.shtml">http://www.calconnect.org/calmobileioplist.shtml</a>
if you are not already a member), or contact me at the e-mail below.<br>
<br>
Hope to see you in Plzen!<br>
<br>
Best Regards,<br>
<br>
Dave Thewlis<br>
<br>
<div class="moz-signature">-- <br>
<font size="-1"><b>Dave Thewlis, Executive Director<br>
Calconnect - The Calendaring and Scheduling Consortium</b><br>
+1 707 840 9391 (voice) &middot; +1 707 498 2238 (mobile)<br>
<a href="http://www.calconnect.org">http://www.calconnect.org</a> &middot; <a
 href="mailto:Dave.Thewlis@calconnect.org">Dave.Thewlis@calconnect.org</a>
</font></div>
</body>
</html>

--------------030606000501070005030201--

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_______________________________________________
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--===============0791948469==--



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CalConnect has announced that its second Mobile Calendaring 
Interoperability Test Event will be a standalone event November 4-6, 
2008, hosted by Kerio Technologies in Plzen, Czech Republic, and 
registration is now open for the event. Several CalConnect members have 
indicated a distinct interest in or plan to participate. Logistics and 
registration information are available at 
http://www.calconnect.org/miop0811.shtml.  The press release announcing 
this event can be found at http://www.calconnect.org/publicity/080728 
CalConnect Mobile IOP Test Event.doc 
<http://www.calconnect.org/publicity/080728%20CalConnect%20Mobile%20IOP%20Test%20Event.doc>.  


As always, this event is open to members and non-members alike; however 
space will be somewhat limited and early registration is advisable.  If 
you have questions about the event, feel free to post to the 
calmobileiop-l list (you may join the list at 
http://www.calconnect.org/calmobileioplist.shtml if you are not already 
a member), or contact me at the e-mail below.

Hope to see you in Plzen!

Best Regards,

Dave Thewlis

-- 
*Dave Thewlis, Executive Director
Calconnect - The Calendaring and Scheduling Consortium*
+1 707 840 9391 (voice) · +1 707 498 2238 (mobile)
http://www.calconnect.org · Dave.Thewlis@calconnect.org 
<mailto:Dave.Thewlis@calconnect.org>

--------------030606000501070005030201
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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</head>
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CalConnect has announced that its second Mobile Calendaring
Interoperability Test Event will be a standalone event November 4-6,
2008, hosted by Kerio Technologies in Plzen, Czech Republic, and
registration is now open for the event. Several CalConnect members have
indicated a distinct interest in or plan to participate. Logistics and
registration information are available at <a
 href="http://www.calconnect.org/miop0811.shtml">http://www.calconnect.org/miop0811.shtml</a>.&nbsp;
The press release announcing this event can be found at <a
 href="http://www.calconnect.org/publicity/080728%20CalConnect%20Mobile%20IOP%20Test%20Event.doc">http://www.calconnect.org/publicity/080728
CalConnect Mobile IOP Test Event.doc</a>.&nbsp; <br>
<br>
As always, this event is open to members and non-members alike; however
space will be somewhat limited and early registration is advisable.&nbsp; If
you
have questions about the event, feel free to post to the calmobileiop-l
list (you may join the list at <a
 href="http://www.calconnect.org/calmobileioplist.shtml">http://www.calconnect.org/calmobileioplist.shtml</a>
if you are not already a member), or contact me at the e-mail below.<br>
<br>
Hope to see you in Plzen!<br>
<br>
Best Regards,<br>
<br>
Dave Thewlis<br>
<br>
<div class="moz-signature">-- <br>
<font size="-1"><b>Dave Thewlis, Executive Director<br>
Calconnect - The Calendaring and Scheduling Consortium</b><br>
+1 707 840 9391 (voice) &middot; +1 707 498 2238 (mobile)<br>
<a href="http://www.calconnect.org">http://www.calconnect.org</a> &middot; <a
 href="mailto:Dave.Thewlis@calconnect.org">Dave.Thewlis@calconnect.org</a>
</font></div>
</body>
</html>

--------------030606000501070005030201--


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From: Dave Thewlis <Dave.Thewlis@calconnect.org>
Organization: The Calendaring and Scheduling Consortium
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Subject: [Ietf-calsify] Registration Open for CalConnect XIII: Roundtable XIII and CalConnect Interoperability Test Event, October 6-10, 2008, Sunnyvale, California
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Registration is now open for CalConnect XIII comprised of Roundtable 
XIII and a CalConnect Interoperability Test Event*, hosted by 
Yahoo/Zimbra in Sunnyvale, California on October 6-10, 2008.

Please see http://www.calconnect.org/calconnect13.shtml for logistics 
information and links to registration for the Roundtable and for the 
CalConnect Interoperability Test Event*.

If you are considering participating in the CalConnect Interoperability 
Test Event*, note that it begins with breakfast on Monday morning the 
6th at 08:00 and runs to noon on Wednesday the 8th.  As usual the 
Roundtable will begin with lunch at 12:30 on Wednesday the 8th  and run 
until early Friday afternoon the 10th. 

A general schedule of events is provided on the logistics page; the 
final schedule of TC sessions, together with topical agendas, will be 
available by mid-September.

We will have a *Technology Preview* on Wednesday afternoon at 1600, 
demonstrating multiple clients and servers participating in Freebusy 
URL, CalDAV Scheduling, and iSCHEDULE server-server scheduling.  
(iSCHEDULE is the HTTP-based instance of iTIP being worked on by the 
iSCHEDULE Technical Committee.)

Hope to see you in Sunnyvale in October!

Cheers,

Dave Thewlis


*This CalConnect Interoperability Test Event will be a "regular" IOP 
test event.  The next MOBILE Calendaring Interoperability Test Event 
will be held in November - see 
http://www.calconnect.org/miop0811.shtml.  (The formal announcement of 
the Mobile IOP Test Event will be made soon.)

-- 
*Dave Thewlis, Executive Director
Calconnect - The Calendaring and Scheduling Consortium*
+1 707 840 9391 (voice) · +1 707 498 2238 (mobile)
http://www.calconnect.org · Dave.Thewlis@calconnect.org 
<mailto:Dave.Thewlis@calconnect.org>

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Registration is now open for CalConnect XIII comprised of Roundtable
XIII and
a CalConnect
Interoperability Test Event*, hosted by Yahoo/Zimbra in Sunnyvale,
California
on October 6-10, 2008.<br>
<br>
Please see&nbsp;<a href="http://www.calconnect.org/calconnect13.shtml">http://www.calconnect.org/calconnect13.shtml</a>
for logistics information and links to registration for the Roundtable
and for the CalConnect Interoperability Test Event*.<br>
<br>
If you are considering participating in the CalConnect Interoperability
Test Event*, note that it begins with breakfast on Monday morning the
6th at 08:00 and
runs to noon on Wednesday the 8th.&nbsp; As usual the Roundtable will begin
with lunch at 12:30 on Wednesday the 8th&nbsp; and run until early Friday
afternoon the 10th.&nbsp; <br>
<br>
A general schedule of events is provided on the logistics page; the
final schedule of TC sessions, together with topical agendas, will be
available by mid-September.<br>
<br>
We will have a <b>Technology Preview</b> on Wednesday
afternoon at 1600, demonstrating multiple clients and servers
participating in Freebusy URL, CalDAV Scheduling, and iSCHEDULE
server-server scheduling.&nbsp; (iSCHEDULE is the HTTP-based instance of
iTIP being worked on by the iSCHEDULE Technical Committee.)<br>
<br>
Hope to see you in Sunnyvale in October!<br>
<br>
Cheers,<br>
<br>
Dave Thewlis<br>
<br>
<br>
*This CalConnect Interoperability Test Event will be a "regular" IOP
test event.&nbsp; The next MOBILE Calendaring Interoperability Test Event
will be held in November - see <a
 href="http://www.calconnect.org/miop0811.shtml">http://www.calconnect.org/miop0811.shtml</a>.&nbsp;
(The formal announcement of the Mobile IOP Test Event will be made
soon.)<br>
<br>
<div class="moz-signature">-- <br>
<font size="-1"><b>Dave Thewlis, Executive Director<br>
Calconnect - The Calendaring and Scheduling Consortium</b><br>
+1 707 840 9391 (voice) &middot; +1 707 498 2238 (mobile)<br>
<a href="http://www.calconnect.org">http://www.calconnect.org</a> &middot; <a
 href="mailto:Dave.Thewlis@calconnect.org">Dave.Thewlis@calconnect.org</a>
</font></div>
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Date: Sun, 27 Jul 2008 21:47:23 +0100
From: Eliot Lear <lear@cisco.com>
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Subject: [Ietf-calsify] we're not meeting this week, but..
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Dear all,

The Calsify WG is not meeting this week.  However, if you would like to 
talk to the chairs, both Aki and I will be available.  Also, we are 
organizing an unofficial social breakfast on Wednesday at 7:30am at the 
restaurant that offers breakfast ;-)  If you'd to join, please drop me a 
line.

All the best,

Eliot


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Subject: [Ietf-calsify] Relationship between STATUS, COMPLETED and PERCENT-COMPLETE
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Are there any implied semantics between STATUS, COMPLETED and
PERCENT-COMPLETE on VTODO? I'm trying to figure out the best way to
indicate status for a task that was performed but was unsuccessful.Is
the combination of STATUS NEEDS-ACTION and a COMPLETED date legal?


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From: "Tim Hare" <TimHare@comcast.net>
To: "'Eliot Lear'" <lear@cisco.com>, "'Bernard Desruisseaux'" <bernard.desruisseaux@oracle.com>, "'Lisa Dusseault'" <lisa@osafoundation.org>, "'Aki Niemi'" <aki.niemi@nokia.com>, <ietf-calsify@osafoundation.org>
Subject: RE: [Ietf-calsify] status of RFC 2445bis - AD Issue #4
Date: Wed, 23 Jul 2008 09:40:25 -0400
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Lisa Dusseault had proposed some text:

>Yes, it's the import scenarios I had in mind.  Even if it's not strictly
Internet Engineering.
>
>Off the top of my head, suggested text change that can certainly be
improved upon, particularly the hand-wavy "other situations":
>
>OLD:
>
>    An iCalendar object MUST include the "PRODID" and "VERSION" calendar
>    properties.  In addition, it MUST include at least one calendar
>    component.  Special forms of iCalendar objects are possible to
>    publish just busy time (i.e., only a "VFREEBUSY" calendar component)
>    or time zone (i.e., only a "VTIMEZONE" calendar component)
>    information.  In addition, a complex iCalendar object that is used to
>    capture a complete snapshot of the contents of a calendar is possible
>    (e.g., composite of many different calendar components).  More
>    commonly, an iCalendar object will consist of just a single "VEVENT",
>    "VTODO" or "VJOURNAL" calendar component.  Applications MUST ignore
>    x-comp and iana-comp they don't recognized.
>
>NEW:
>
>    An iCalendar object MUST include the "PRODID" and "VERSION" calendar
>    properties.  In addition, it MUST include at least one calendar
>    component.   Applications MUST ignore
>    x-comp and iana-comp they don't recognized.
>
>	When iCalendar objects are sent out using iTIP, these usually
>    consist of just a single "VEVENT", "VTODO" or "VJOURNAL" calendar
>    component.  The recipient is expected to support any of these.  In
other
>    situtations, iCalendar objects may contain only a "VFREEBUSY"
>    or "VTIMEZONE" calendar component.  Finally, complex iCalendar
>    objects containing several different calendar components are used
>    to capture a complete snapshot of the contents of a calendar, task
list,
>    project file or other application construct.
>
>    Applications that support importing iCalendar objects SHOULD
>    support all of the component types defined in this document, and
>    SHOULD NOT silently drop any components as that can lead
>    to user data loss.

Bernard Desruisseaux had stated previously:

>Things that should be noted:
>
>1- iTIP does not allow different component types to be mixed.

I believe multiple component types should be allowed within ITIP for certain
METHOD: values, PUBLISH being the first that comes to mind, (although for
one of the use cases, moving the entire contents of a calendar, a new method
type  of TRANSPORT might be in order).

I would reword suggest slightly different wording for Lisa's last paragraph
(although this could use some work, too, I fear):

NEW:

Some applications provide a function to read iCalendar objects in a
non-scheduling context, for example to import a copy of a calendar which was
exported for backup. These applications SHOULD support iCalendar objects
which contain several different component types as long as the types are
valid component types defined in this document. Applications which import
iCalendar objects and  which do not process all of the component types in an
iCalendar object SHOULD inform the user that some components were ignored,
and SHOULD inform the user or create a log of which components were ignored.


Tim Hare
Interested Bystander, Non-Inc.

-----Original Message-----
From: ietf-calsify-bounces@osafoundation.org
[mailto:ietf-calsify-bounces@osafoundation.org] On Behalf Of Eliot Lear
Sent: Wednesday, July 23, 2008 8:24 AM
To: Bernard Desruisseaux; Lisa Dusseault; Aki Niemi;
ietf-calsify@osafoundation.org
Subject: [Ietf-calsify] status of RFC 2445bis

Lisa, Bernard, Aki, all:

I've held off sending this note because Bernard was on holiday last week.
Here is my understanding of the AD issues:

AD Issue 1:

A disagreement between Bernard and everyone else.  Bernard, rough consensus
says that you should change the text accordingly.

AD Issue 2:

There needs to be a statement as to what URIs are allowed and how they are
to be resolved (in the case of HTTP and HTTPs).

AD Issue 3:

Bernard has come up with what seems like sufficient grounds to leave things
as they are in the draft.

AD Issue 4:

Bernard has requested text, but there is consensus that text is needed and
we are currently blocking on that.

I would like to see this draft move forward quickly after IETF.  
Bernard, can you please address each issue in an update?

Thanks,

Eliot
_______________________________________________
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Date: Wed, 23 Jul 2008 14:24:18 +0200
From: Eliot Lear <lear@cisco.com>
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To: Bernard Desruisseaux <bernard.desruisseaux@oracle.com>, Lisa Dusseault <lisa@osafoundation.org>, Aki Niemi <aki.niemi@nokia.com>, "ietf-calsify@osafoundation.org" <ietf-calsify@osafoundation.org>
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Subject: [Ietf-calsify] status of RFC 2445bis
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Lisa, Bernard, Aki, all:

I've held off sending this note because Bernard was on holiday last 
week.  Here is my understanding of the AD issues:

AD Issue 1:

A disagreement between Bernard and everyone else.  Bernard, rough 
consensus says that you should change the text accordingly.

AD Issue 2:

There needs to be a statement as to what URIs are allowed and how they 
are to be resolved (in the case of HTTP and HTTPs).

AD Issue 3:

Bernard has come up with what seems like sufficient grounds to leave 
things as they are in the draft.

AD Issue 4:

Bernard has requested text, but there is consensus that text is needed 
and we are currently blocking on that.

I would like to see this draft move forward quickly after IETF.  
Bernard, can you please address each issue in an update?

Thanks,

Eliot


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Subject: Re: [Ietf-calsify] Why no empty calendar?
Date: Mon, 14 Jul 2008 15:55:00 -0700
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On Jul 8, 2008, at 6:12 PM, Tim Hare wrote:

> When you're discussing polling, you're in the realm of Atom or RSS and
> subscriptions, where eliminating the error message is "natural" - my  
> RSS
> reader doesn't tell me when the feed has not been updated. If,  
> however we
> allow VCALENDARs to be empty, a UA which imports a calendar through
> mechanisms other than a subscription definitely needs to warn the  
> user.
>
> I'll have to think more deeply on this; perhaps there needs to be an  
> iTIP- /
> iMIP- document to describe behaviors when iCalendar objects are  
> consumed in
> ways other than mail, CalDAV, or subscriptions?

+1.  Actually I think the subscription case needs to be fleshed out too.

I drafted some text a little while back, that might have been a 2445  
appendix, but could instead get used in a separate doc.  This starts  
out as drafty text but then turns into somewhat of an outline.

Lisa

----

X.  Importing and exporting iCalendar Data

The iCalendar specification is commonly used as the basis for  
exporting calendar files that can be imported into different software  
when users need to move their calendars around. This document  
describes that practice.  It is intended to be descriptive rather than  
normative.

The file type and extension are as specified in RFC2445bis.

When a user has several calendars for different categories or contexts  
(such as "home", "work" and "local events"), user agents most commonly  
export these as separate files rather than using categories within one  
big file.  This works well with user agents that import each ICS file  
as a new calendar.  Another common practice is to name the export file  
after the calendar, e.g. "work.ics".

X.1. Components

All iCalendar components can be mixed in the same file.  VTIMEZONE  
components SHOULD be included in the same file where the timezone  
definitions are used.

X.1.1 VTODOs

Many, but not all clients, can handle importing VTODOs along with  
VEVENTS.  When the user maintains several different calendars for  
different contexts, the VTODOs are usually associated with the same  
contexts as the VEVENTs: (e.g. "home tasks" and "work tasks").  Thus,  
it's very convenient to export VTODOs in the same file as VEVENTS.    
However, there are still some calendar agents that don't handle tasks,  
and users might find their tasks disappearing or even confusing the  
importing piece of software.   It might be a useful feature to allow  
users the choice of including VTODOs in export files or leaving them  
out.

VTODOs can be recurring items, can have due dates and alarms. This  
should be supported, otherwise the user must be warned if information  
is being lost in import.

X.1.2 VJOURNALs

VJOURNAL components are even less consistently handled.   They are  
used in some time-management software to allow users to enter quick  
notes, that might turn into tasks or events or may simply be archived  
as plain notes.   However, when a user agent has no ability to display  
notes as separate components from calendar events, the user at least  
needs to be made aware that some types of components are not being  
preserved in the import.

Not all properties are routinely supported on VJOURNAL items.   
CONTACT, ORGANIZER, RECURRING, SEQUENCE  properties are not. ,.. what  
else?  Alarms... perhaps attachments should be recommended here, and  
most other things advised against.

X.2. Alarms

choice to clear all alarms when importing
default choice when exporting should be to include
how to convert to local context
how the ATTACH property points to a local file

importing client MUST be able to handle multiple alarms on the same  
parent component

X.3.  Attachments

How does this work anyway?  Is CID URL really used?  Where are the  
content parts stored, that are referenced?


X.4.  Other considerationsw

The FREEBUSY properties on an iCalendar object should be preserved in  
this way...

The METHOD property should not appear

The PRODID property can be dropped/changed on import, but should be  
saved on export for debugging information.

CATEGORIES are generally treated as keywords, either folksonomies or  
specific categories in some enterprise systems.  In either case,  
categories are not usually given top-level UI treatment -- instead,  
separate calendars (separate iCalendar files) are more commonly used  
as the model.

COMMENT properties are not common.  User agents may fold this into  
description during import.

How are invitations handled?  How can a user see, when they import an  
event into a new piece of software, that this was received as an  
invitation and from whom and when?

How often is RELATED-TO really used and what for?  Can a user agent  
drop this on import?

Y.  Security Considerations (to add to security considerations already  
there)

Respecting CLASS:private and confidential

---


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Subject: Re: AD review issue #4: Supporting both VTODO and VEVENT in	thesame iCalendar stream (was: Re: [Ietf-calsify] Re: AD review	on2445bis)
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Yes, it's the import scenarios I had in mind.  Even if it's not  
strictly Internet Engineering.

Off the top of my head, suggested text change that can certainly be  
improved upon, particularly the hand-wavy "other situations":

OLD:

    An iCalendar object MUST include the "PRODID" and "VERSION" calendar
    properties.  In addition, it MUST include at least one calendar
    component.  Special forms of iCalendar objects are possible to
    publish just busy time (i.e., only a "VFREEBUSY" calendar component)
    or time zone (i.e., only a "VTIMEZONE" calendar component)
    information.  In addition, a complex iCalendar object that is used  
to
    capture a complete snapshot of the contents of a calendar is  
possible
    (e.g., composite of many different calendar components).  More
    commonly, an iCalendar object will consist of just a single  
"VEVENT",
    "VTODO" or "VJOURNAL" calendar component.  Applications MUST ignore
    x-comp and iana-comp they don't recognized.

NEW:

    An iCalendar object MUST include the "PRODID" and "VERSION" calendar
    properties.  In addition, it MUST include at least one calendar
    component.   Applications MUST ignore
    x-comp and iana-comp they don't recognized.

	When iCalendar objects are sent out using iTIP, these usually
    consist of just a single "VEVENT", "VTODO" or "VJOURNAL" calendar
    component.  The recipient is expected to support any of these.  In  
other
    situtations, iCalendar objects may contain only a "VFREEBUSY"
    or "VTIMEZONE" calendar component.  Finally, complex iCalendar
    objects containing several different calendar components are used
    to capture a complete snapshot of the contents of a calendar, task  
list,
    project file or other application construct.

    Applications that support importing iCalendar objects SHOULD
    support all of the component types defined in this document, and
    SHOULD NOT silently drop any components as that can lead
    to user data loss.

Lisa

On Jul 4, 2008, at 1:17 PM, Tim Hare wrote:

> I can't speak for Lisa, but the export/import scenario is one place  
> where b)
> applies.  If by "Internet calendar" you mean an .ics file that is  
> opened via
> browser, that is also an 'import' scenario I think.
>
>
> Tim Hare
> Interested Bystander, Non-Inc.
>
> -----Original Message-----
> From: Bernard Desruisseaux [mailto:bernard.desruisseaux@oracle.com]
> Sent: Friday, July 04, 2008 11:06 AM
> To: Eliot Lear
> Cc: Tim Hare; ietf-calsify@osafoundation.org
> Subject: Re: AD review issue #4: Supporting both VTODO and VEVENT in  
> thesame
> iCalendar stream (was: Re: [Ietf-calsify] Re: AD review on2445bis)
>
> It's not clear to me what Lisa is suggesting actually.
>
> a) Warning about the fact that components type can be mixed?
> b) Not to ignore unsupported component types silently?
>
> Proposed text would be great!
>
> Things that should be noted:
>
> 1- iTIP does not allow different component types to be mixed.
>
> 2- CalDAV provides means to get only the components types that you  
> want.
>
> As such, in practice we will only see mixed component types in export
> scenarios and Internet calendars (aka, webcal).
>
> Cheers,
> Bernard
>
> Eliot Lear wrote:
>> I believe we have consensus as to Lisa's suggestion.  Any  
>> disagreement?
>>
>> Eliot
>>
>> Tim Hare wrote:
>>> As an "informed user" - i.e. not a developer, I definitely support
>>> NON-silent rejection.  I can agree with non-support of certain
>>> components only if I receive some notification;  due to work
>>> requirements I am now journalling my time on some projects, and it
>>> would be good to know if I can't import that data into another tool.
>>>
>>>
>>> Tim Hare
>>> Interested Bystander, Non-Inc.
>>>
>>> -----Original Message-----
>>> From: ietf-calsify-bounces@osafoundation.org
>>> [mailto:ietf-calsify-bounces@osafoundation.org] On Behalf Of Cyrus
>>> Daboo
>>> Sent: Monday, June 16, 2008 12:33 PM
>>> To: Lisa Dusseault
>>> Cc: ietf-calsify@osafoundation.org; Bernard Desruisseaux
>>> Subject: Re: AD review issue #4: Supporting both VTODO and VEVENT in
>>> thesame iCalendar stream (was: Re: [Ietf-calsify] Re: AD review
>>> on2445bis)
>>>
>>> Hi Lisa,
>>>
>>> --On June 16, 2008 9:25:14 AM -0700 Lisa
>>> Dusseault<lisa@osafoundation.org>
>>> wrote:
>>>
>>>
>>>>> The suggestion of an implementation note that describes the  
>>>>> "common
>>>>> use" of the components and explains that some may be supported and
>>>>> others not is fine. In fact telling implementors that they need to
>>>>> be prepared for another system to reject a component would be  
>>>>> good.
>>>>>
>>>> I can get behind that.  I'd also like to recommend that systems not
>>>> reject a component silently -- a user needs to know if they  
>>>> imported
>>>> a iCalendar file and lost 50 VJOURNAL components in the process.
>>>>
>>>
>>> Agreed.
>>>
>>> Note that iTIP does have a status code for "Unsupported Component"
>>> (3.13) -
>>> so informing the originator of the iCalendar data that they are
>>> sending something that is not supported by the recipient is  
>>> covered by
> that.
>>>
>>> --
>>> Cyrus Daboo
>>>
>>> _______________________________________________
>>> Ietf-calsify mailing list
>>> Ietf-calsify@osafoundation.org
>>> http://lists.osafoundation.org/mailman/listinfo/ietf-calsify
>>>
>>>
>>> _______________________________________________
>>> Ietf-calsify mailing list
>>> Ietf-calsify@osafoundation.org
>>> http://lists.osafoundation.org/mailman/listinfo/ietf-calsify
>>>
>>>
>>
>> _______________________________________________
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>>
>
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>
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Thank you, Cyrus, for this update that contains IANA Considerations and 
an updated Appendix of changes.

Eliot

Internet-Drafts@ietf.org wrote:
> A New Internet-Draft is available from the on-line Internet-Drafts directories.
> This draft is a work item of the Calendaring and Scheduling Standards Simplification Working Group of the IETF.
>
>
> 	Title           : iCalendar Transport-Independent Interoperability Protocol (iTIP)
> 	Author(s)       : C. Daboo
> 	Filename        : draft-ietf-calsify-2446bis-07.txt
> 	Pages           : 126
> 	Date            : 2008-07-14
>
> This document specifies a protocol using the iCalendar object
> specification to provide scheduling interoperability between
> different calendar systems.  This is done without reference to a
> specific transport protocol so as to allow multiple methods of
> communication between systems.  Subsequent documents will define
> profiles of this protocol using specific interoperable methods of
> communications between systems.
>
> iTIP complements the iCalendar object specification by adding
> semantics for group scheduling methods commonly available in current
> calendar systems.  These scheduling methods permit two or more
> calendar systems to perform transactions such as publish, schedule,
> reschedule, respond to scheduling requests, negotiation of changes or
> cancel.
>
> A URL for this Internet-Draft is:
> http://www.ietf.org/internet-drafts/draft-ietf-calsify-2446bis-07.txt
>
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
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Thank you, Cyrus, for this update that contains IANA Considerations and
an updated Appendix of changes.<br>
<br>
Eliot<br>
<br>
<a class="moz-txt-link-abbreviated" href="mailto:Internet-Drafts@ietf.org">Internet-Drafts@ietf.org</a> wrote:
<blockquote cite="mid:20080714181502.1C5F03A6A5C@core3.amsl.com"
 type="cite">
  <pre wrap="">A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Calendaring and Scheduling Standards Simplification Working Group of the IETF.


	Title           : iCalendar Transport-Independent Interoperability Protocol (iTIP)
	Author(s)       : C. Daboo
	Filename        : draft-ietf-calsify-2446bis-07.txt
	Pages           : 126
	Date            : 2008-07-14

This document specifies a protocol using the iCalendar object
specification to provide scheduling interoperability between
different calendar systems.  This is done without reference to a
specific transport protocol so as to allow multiple methods of
communication between systems.  Subsequent documents will define
profiles of this protocol using specific interoperable methods of
communications between systems.

iTIP complements the iCalendar object specification by adding
semantics for group scheduling methods commonly available in current
calendar systems.  These scheduling methods permit two or more
calendar systems to perform transactions such as publish, schedule,
reschedule, respond to scheduling requests, negotiation of changes or
cancel.

A URL for this Internet-Draft is:
<a class="moz-txt-link-freetext" href="http://www.ietf.org/internet-drafts/draft-ietf-calsify-2446bis-07.txt">http://www.ietf.org/internet-drafts/draft-ietf-calsify-2446bis-07.txt</a>

Internet-Drafts are also available by anonymous FTP at:
<a class="moz-txt-link-freetext" href="ftp://ftp.ietf.org/internet-drafts/">ftp://ftp.ietf.org/internet-drafts/</a>

Below is the data which will enable a MIME compliant mail reader
implementation to automatically retrieve the ASCII version of the
Internet-Draft.
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  <pre wrap="">
<hr size="4" width="90%">
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<a class="moz-txt-link-freetext" href="http://lists.osafoundation.org/mailman/listinfo/ietf-calsify">http://lists.osafoundation.org/mailman/listinfo/ietf-calsify</a>
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Calendaring and Scheduling Standards Simplification Working Group of the IETF.


	Title           : iCalendar Transport-Independent Interoperability Protocol (iTIP)
	Author(s)       : C. Daboo
	Filename        : draft-ietf-calsify-2446bis-07.txt
	Pages           : 126
	Date            : 2008-07-14

This document specifies a protocol using the iCalendar object
specification to provide scheduling interoperability between
different calendar systems.  This is done without reference to a
specific transport protocol so as to allow multiple methods of
communication between systems.  Subsequent documents will define
profiles of this protocol using specific interoperable methods of
communications between systems.

iTIP complements the iCalendar object specification by adding
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calendar systems.  These scheduling methods permit two or more
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reschedule, respond to scheduling requests, negotiation of changes or
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From: Helge Hess <helge.hess@opengroupware.org>
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Subject: Re: [Ietf-calsify] Question about etag support for freebusy report
Date: Sun, 13 Jul 2008 00:42:41 +0200
References: <1215770315.7298.21.camel@ganso>
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On 11.07.2008, at 11:58, Ernesto Revilla wrote:
> Strong Etags must be supported by CS, as by RFC 4791.
>
> Any report method, like freebusy reports, normally do not provide =20
> etags.
>
> =BFCorrect?


Yes.

Greets,
   Helge
--=20
Helge Hess
http://helgehess.eu/=


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From: Ernesto Revilla <erevilla@yaco.es>
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Subject: [Ietf-calsify] Question about etag support for freebusy report
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Hi.

Strong Etags must be supported by CS, as by RFC 4791.

Any report method, like freebusy reports, normally do not provide etags.

Â¿Correct?

Thanx.
Erny
Yaco Sistemas
Spain



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From: "Tim Hare" <TimHare@comcast.net>
To: "'Reinhold Kainhofer'" <reinhold@kainhofer.com>, <ietf-calsify@osafoundation.org>
Subject: RE: [Ietf-calsify] Why no empty calendar?
Date: Tue, 8 Jul 2008 21:12:36 -0400
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When you're discussing polling, you're in the realm of Atom or RSS and
subscriptions, where eliminating the error message is "natural" - my RSS
reader doesn't tell me when the feed has not been updated. If, however we
allow VCALENDARs to be empty, a UA which imports a calendar through
mechanisms other than a subscription definitely needs to warn the user. 

I'll have to think more deeply on this; perhaps there needs to be an iTIP- /
iMIP- document to describe behaviors when iCalendar objects are consumed in
ways other than mail, CalDAV, or subscriptions?


Tim Hare
Interested Bystander, Non-Inc.

-----Original Message-----
From: Reinhold Kainhofer [mailto:reinhold@kainhofer.com] 
Sent: Tuesday, July 08, 2008 5:57 PM
To: ietf-calsify@osafoundation.org
Cc: Tim Hare; 'Helge Hess'
Subject: Re: [Ietf-calsify] Why no empty calendar?

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Am Dienstag, 8. Juli 2008 schrieb Tim Hare:
> OK I understand the use case now; so my only statement will be that 
> any UA which processes the file (please note, you do not have to 
> subscribe to it, it's perfectly OK to reference an .ics file via an 
> anchor tag and href attribute, with a file association which causes it 
> to be opened by a particular desktop program) MUST warn that it is empty.

I don't think that should really be a MUST. If I add a remote calendar file
(i.e. a URL that will be regularly polled) to my personal organizer, I
simply want its events to be displayed in my UA. I don't want to be bothered
with "WARNING: The calendar blahblah does not contain any events!" messages
whenever the application polls the calendar.

Of course, there are situations where a warning makes sense, but in other
situations it is simply annoying to the user.

Cheers,
Reinhold


- --
- ------------------------------------------------------------------
Reinhold Kainhofer, Vienna University of Technology, Austria
email: reinhold@kainhofer.com, http://reinhold.kainhofer.com/
 * Financial and Actuarial Mathematics, TU Wien,
http://www.fam.tuwien.ac.at/
 * K Desktop Environment, http://www.kde.org, KOrganizer maintainer
 * Chorvereinigung "Jung-Wien", http://www.jung-wien.at/ -----BEGIN PGP
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From: Reinhold Kainhofer <reinhold@kainhofer.com>
Organization: Vienna University of Technology
To: ietf-calsify@osafoundation.org
Subject: Re: [Ietf-calsify] Why no empty calendar?
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Am Dienstag, 8. Juli 2008 schrieb Tim Hare:
> OK I understand the use case now; so my only statement will be that any UA
> which processes the file (please note, you do not have to subscribe to it,
> it's perfectly OK to reference an .ics file via an anchor tag and href
> attribute, with a file association which causes it to be opened by a
> particular desktop program) MUST warn that it is empty.

I don't think that should really be a MUST. If I add a remote calendar file 
(i.e. a URL that will be regularly polled) to my personal organizer, I simply 
want its events to be displayed in my UA. I don't want to be bothered 
with "WARNING: The calendar blahblah does not contain any events!" messages 
whenever the application polls the calendar.

Of course, there are situations where a warning makes sense, but in other 
situations it is simply annoying to the user.

Cheers,
Reinhold


- -- 
- ------------------------------------------------------------------
Reinhold Kainhofer, Vienna University of Technology, Austria
email: reinhold@kainhofer.com, http://reinhold.kainhofer.com/
 * Financial and Actuarial Mathematics, TU Wien, http://www.fam.tuwien.ac.at/
 * K Desktop Environment, http://www.kde.org, KOrganizer maintainer
 * Chorvereinigung "Jung-Wien", http://www.jung-wien.at/
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From: "Tim Hare" <TimHare@comcast.net>
To: "'Helge Hess'" <helge.hess@opengroupware.org>
Subject: RE: [Ietf-calsify] Why no empty calendar?
Date: Tue, 8 Jul 2008 17:18:09 -0400
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OK I understand the use case now; so my only statement will be that any UA
which processes the file (please note, you do not have to subscribe to it,
it's perfectly OK to reference an .ics file via an anchor tag and href
attribute, with a file association which causes it to be opened by a
particular desktop program) MUST warn that it is empty.

 


Tim Hare
Interested Bystander, Non-Inc.

-----Original Message-----
From: Helge Hess [mailto:helge.hess@opengroupware.org] 
Sent: Tuesday, July 08, 2008 5:10 PM
To: Tim Hare
Cc: 'Cyrus Daboo'; ietf-calsify@osafoundation.org
Subject: Re: [Ietf-calsify] Why no empty calendar?

+1, makes sense to me.

On 08.07.2008, at 22:53, Tim Hare wrote:
> What's the use case for publishing an empty calendar?
>
> Why would I want to open that file, assuming I found it using some 
> sort of calendar search?

You do not 'open' the 'file', you subscribe it. While it may not contain
events now, it might contain some in the future.

Using the transport layer for this (eg HTTP 404) is not that good. The
calendar actually exists and is valid, its just empty at a specific point in
time.
The only other option might be to return an empty resource (content-
length: 0). But then the calendar component itself might have interesting
meta data.

Thanks,
   Helge

PS: I'm pretty sure that most iCal tools already work that way ...
--
Helge Hess
http://helgehess.eu/




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From: Helge Hess <helge.hess@opengroupware.org>
To: "Tim Hare" <TimHare@comcast.net>
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Subject: Re: [Ietf-calsify] Why no empty calendar?
Date: Tue, 8 Jul 2008 23:09:54 +0200
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+1, makes sense to me.

On 08.07.2008, at 22:53, Tim Hare wrote:
> What's the use case for publishing an empty calendar?
>
> Why would I want to open that file, assuming I found it using some  
> sort of
> calendar search?

You do not 'open' the 'file', you subscribe it. While it may not  
contain events now, it might contain some in the future.

Using the transport layer for this (eg HTTP 404) is not that good. The  
calendar actually exists and is valid, its just empty at a specific  
point in time.
The only other option might be to return an empty resource (content- 
length: 0). But then the calendar component itself might have  
interesting meta data.

Thanks,
   Helge

PS: I'm pretty sure that most iCal tools already work that way ...
-- 
Helge Hess
http://helgehess.eu/


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Date: Tue, 08 Jul 2008 17:04:51 -0400
From: Cyrus Daboo <cyrus@daboo.name>
To: Tim Hare <TimHare@comcast.net>, ietf-calsify@osafoundation.org
Subject: RE: [Ietf-calsify] Why no empty calendar?
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Hi Tim,

--On July 8, 2008 4:53:42 PM -0400 Tim Hare <TimHare@comcast.net> wrote:

> What's the use case for publishing an empty calendar?
>
> Why would I want to open that file, assuming I found it using some sort of
> calendar search?

I create a new calendar on my web calendar system that exposes the calendar 
data as an .ics file (e.g. webcal://).

I can send out the subscription URL before events are added (perhaps I am 
not the one who will add events, I might be the system admin and only 
tasked with creating calendars for other people who will author them).

You want that file because at some point it will have events in it and your 
client will poll and pick those up.

-- 
Cyrus Daboo



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From: "Tim Hare" <TimHare@comcast.net>
To: "'Cyrus Daboo'" <cyrus@daboo.name>, <ietf-calsify@osafoundation.org>
Subject: RE: [Ietf-calsify] Why no empty calendar?
Date: Tue, 8 Jul 2008 16:53:42 -0400
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What's the use case for publishing an empty calendar?

Why would I want to open that file, assuming I found it using some sort of
calendar search? 

If this _were_ allowed in some future revision, then I would vote that a UA
MUST warn that the file is empty when opened. No one wants to open an .ics
file (say for example the schedule for the Irish National Hurling
Championships) to add something to their calendar, get nothing added, and
not be informed.  It's already sometimes onerous when a UA opens a calendar
file _with_ data but doesn't position you to, or tell you about, the first
item added - you then end up hunting through calendar entries to make sure
what you thought would happened did in fact happen.


Tim Hare
Interested Bystander, Non-Inc.

-----Original Message-----
From: ietf-calsify-bounces@osafoundation.org
[mailto:ietf-calsify-bounces@osafoundation.org] On Behalf Of Cyrus Daboo
Sent: Tuesday, July 08, 2008 4:44 PM
To: ietf-calsify@osafoundation.org
Subject: [Ietf-calsify] Why no empty calendar?

Hi,
(Whilst I realize it is too late for changes to 2445bis now, I think it is
still worth raising issues and using the issue tracker to log problems that
could be considered in a future revision - assuming Eliot does not mind
leaving the tracker up).

Currently both 2445 and 2445bis make it impossible to have an empty
VCALENDAR object. i.e. a VCALENDAR with only properties - no components. 
The relevant ABNF is:

        icalbody   = calprops component


        component  = 1*(eventc / todoc / journalc / freebusyc /
                     timezonec / iana-comp / x-comp)

The workaround is to send a single VTIMEZONE object or a bogus X- component
(perhaps BEGIN:X-2445-IS-SILLY), or a bogus "regular" component. But that
seems a little silly. It should be perfectly possible for me to publish an
empty calendar.

Proposal: relax the restriction that a VCALENDAR object has to contain "one
or more" components, to instead allow "zero or more" components, and adjust
ABNF and text accordingly.

--
Cyrus Daboo

_______________________________________________
Ietf-calsify mailing list
Ietf-calsify@osafoundation.org
http://lists.osafoundation.org/mailman/listinfo/ietf-calsify




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Hi,
(Whilst I realize it is too late for changes to 2445bis now, I think it is 
still worth raising issues and using the issue tracker to log problems that 
could be considered in a future revision - assuming Eliot does not mind 
leaving the tracker up).

Currently both 2445 and 2445bis make it impossible to have an empty 
VCALENDAR object. i.e. a VCALENDAR with only properties - no components. 
The relevant ABNF is:

        icalbody   = calprops component


        component  = 1*(eventc / todoc / journalc / freebusyc /
                     timezonec / iana-comp / x-comp)

The workaround is to send a single VTIMEZONE object or a bogus X- component 
(perhaps BEGIN:X-2445-IS-SILLY), or a bogus "regular" component. But that 
seems a little silly. It should be perfectly possible for me to publish an 
empty calendar.

Proposal: relax the restriction that a VCALENDAR object has to contain "one 
or more" components, to instead allow "zero or more" components, and adjust 
ABNF and text accordingly.

-- 
Cyrus Daboo



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To: Bernard Desruisseaux <bernard.desruisseaux@oracle.com>
Subject: Re: [Ietf-calsify] Re: AD review issue #1: Use of ALTREP
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From: "Robert Ransdell" <Robert_Ransdell@notesdev.ibm.com>
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References: <1F85ABB9-62D3-4AB6-8F1D-D3B4507806A8@osafoundation.org><1213599798.9973.124.camel@little.research.nokia.com><1213610174.9973.136.camel@little.research.nokia.com><8838196F-017B-4780-B182-CFF3E37FFCDF@osafoundation.org><1214218197.9973.325.camel@little.research.nokia.com><AD40FD9A-EEA8-4650-9E7A-27E51D1784FD@osafoundation.org><48664825.3010907@cisco.com> <486E2B13.2090009@oracle.com>
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Notes uses it on Description and Comment.



From:
Bernard Desruisseaux <bernard.desruisseaux@oracle.com>
To:
Eliot Lear <lear@cisco.com>
Cc:
"ietf-calsify@osafoundation.org" <ietf-calsify@osafoundation.org>
Date:
07/04/2008 09:56 AM
Subject:
[Ietf-calsify] Re: AD review issue #1: Use of ALTREP
Sent by:
ietf-calsify-bounces@osafoundation.org



I don't believe the current proposal is appropriate.

As it stands, the draft (RFC2445 as well) makes it clear that ALTREP is=20
only allowed on 6 specific text properties, that is, COMMENT,=20
DESCRIPTION, LOCATION, RESOURCES, SUMMARY, and CONTACT. I also believe=20
the meaning of ALTREP is already properly defined.

In practice though, I'm not sure there is a single calendar user agent=20
that exposes it (i.e., allow an end user to set its value, or make use=20
of it).

Finally, the following search on the web will only report two iCalendar=20
objects that makes use of ALTREP!

http://www.google.com/search?q=3DALTREP+filetype%3Aics

In the past we've discussed limiting the URI schemes allowed for=20
CAL-ADDRESS but never got around to it.  Perhaps we should limit the URI=20
schemed allowed both for ALTREP and CAL-ADDRESS (two sets) while we're=20
at it.

On the other hand, when applications while actually start making use of=20
ALTREP, I suspect the media type of the resource being pointed at might=20
be the real interop issue (e.g., http URL pointing to an XHTML, HTML,=20
PDF, PNG, or JPG document).

Cheers,
Bernard

Eliot Lear wrote:
> Am I correct in that this issue is to be resolved as below?  Are there=20
> any objections?
>=20
> Eliot
>=20
> Lisa Dusseault wrote:
>>
>> On Jun 23, 2008, at 3:49 AM, Aki Niemi wrote:
>>
>>> May I suggest an alternative approach? Since the list of "known" uses=20
of
>>> ALTREP can actually be narrowed down to about three, I think we should
>>> add to the definition of each of these properties exactly what it=20
means
>>> to receive one with the ALTREP parameter that contains an HTTP URL.
>>> Other URIs permitted, but their meaning is undefined. In other words,
>>> document current practice as much as we can, but keep further uses=20
open.
>>>
>>> And then to ALTREP parameter, add the description you propose, as
>>> generic advice to how the parameter should be handled/used.
>>
>> +1
>> =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F
>> Ietf-calsify mailing list
>> Ietf-calsify@osafoundation.org
>> http://lists.osafoundation.org/mailman/listinfo/ietf-calsify
>>
>=20
>=20

=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F
Ietf-calsify mailing list
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http://lists.osafoundation.org/mailman/listinfo/ietf-calsify




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<br><font size=3D2 face=3D"sans-serif">Notes uses it on Description and Com=
ment.</font><br><br><br><table width=3D100%><tr valign=3Dtop><td><font size=
=3D1 color=3D#5f5f5f face=3D"sans-serif">From:</font><td><font size=3D1 fac=
e=3D"sans-serif">Bernard Desruisseaux &lt;bernard.desruisseaux@oracle.com&g=
t;</font><tr valign=3Dtop><td><font size=3D1 color=3D#5f5f5f face=3D"sans-s=
erif">To:</font><td><font size=3D1 face=3D"sans-serif">Eliot Lear &lt;lear@=
cisco.com&gt;</font><tr><td valign=3Dtop><font size=3D1 color=3D#5f5f5f fac=
e=3D"sans-serif">Cc:</font><td><font size=3D1 face=3D"sans-serif">&quot;iet=
f-calsify@osafoundation.org&quot;
&lt;ietf-calsify@osafoundation.org&gt;</font><tr valign=3Dtop><td><font siz=
e=3D1 color=3D#5f5f5f face=3D"sans-serif">Date:</font><td><font size=3D1 fa=
ce=3D"sans-serif">07/04/2008 09:56 AM</font><tr valign=3Dtop><td><font size=
=3D1 color=3D#5f5f5f face=3D"sans-serif">Subject:</font><td><font size=3D1 =
face=3D"sans-serif">[Ietf-calsify] Re: AD review issue #1:
Use of ALTREP</font><tr valign=3Dtop><td><font size=3D1 color=3D#5f5f5f fac=
e=3D"sans-serif">Sent by:</font><td><font size=3D1 face=3D"sans-serif">ietf=
-calsify-bounces@osafoundation.org</font></table><br><hr noshade><br><br><b=
r><tt><font size=3D2>I don't believe the current proposal is appropriate.<b=
r><br>As it stands, the draft (RFC2445 as well) makes it clear that ALTREP =
is
<br>only allowed on 6 specific text properties, that is, COMMENT, <br>DESCR=
IPTION, LOCATION, RESOURCES, SUMMARY, and CONTACT. I also believe
<br>the meaning of ALTREP is already properly defined.<br><br>In practice t=
hough, I'm not sure there is a single calendar user agent
<br>that exposes it (i.e., allow an end user to set its value, or make use
<br>of it).<br><br>Finally, the following search on the web will only repor=
t two iCalendar
<br>objects that makes use of ALTREP!<br><br></font></tt><a href=3D"http://=
www.google.com/search?q=3DALTREP+filetype%3Aics"><tt><font size=3D2>http://=
www.google.com/search?q=3DALTREP+filetype%3Aics</font></tt></a><tt><font si=
ze=3D2><br><br>In the past we've discussed limiting the URI schemes allowed=
 for <br>CAL-ADDRESS but never got around to it. &nbsp;Perhaps we should li=
mit the
URI <br>schemed allowed both for ALTREP and CAL-ADDRESS (two sets) while we=
're
<br>at it.<br><br>On the other hand, when applications while actually start=
 making use of
<br>ALTREP, I suspect the media type of the resource being pointed at might
<br>be the real interop issue (e.g., http URL pointing to an XHTML, HTML, <=
br>PDF, PNG, or JPG document).<br><br>Cheers,<br>Bernard<br><br>Eliot Lear =
wrote:<br>&gt; Am I correct in that this issue is to be resolved as below? =
&nbsp;Are
there <br>&gt; any objections?<br>&gt; <br>&gt; Eliot<br>&gt; <br>&gt; Lisa=
 Dusseault wrote:<br>&gt;&gt;<br>&gt;&gt; On Jun 23, 2008, at 3:49 AM, Aki =
Niemi wrote:<br>&gt;&gt;<br>&gt;&gt;&gt; May I suggest an alternative appro=
ach? Since the list of &quot;known&quot;
uses of<br>&gt;&gt;&gt; ALTREP can actually be narrowed down to about three=
, I think
we should<br>&gt;&gt;&gt; add to the definition of each of these properties=
 exactly
what it means<br>&gt;&gt;&gt; to receive one with the ALTREP parameter that=
 contains an
HTTP URL.<br>&gt;&gt;&gt; Other URIs permitted, but their meaning is undefi=
ned. In other
words,<br>&gt;&gt;&gt; document current practice as much as we can, but kee=
p further
uses open.<br>&gt;&gt;&gt;<br>&gt;&gt;&gt; And then to ALTREP parameter, ad=
d the description you propose,
as<br>&gt;&gt;&gt; generic advice to how the parameter should be handled/us=
ed.<br>&gt;&gt;<br>&gt;&gt; +1<br>&gt;&gt; =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F<br>&gt;&gt; Ietf-calsify mailing list<=
br>&gt;&gt; Ietf-calsify@osafoundation.org<br>&gt;&gt; </font></tt><a href=
=3D"http://lists.osafoundation.org/mailman/listinfo/ietf-calsify"><tt><font=
 size=3D2>http://lists.osafoundation.org/mailman/listinfo/ietf-calsify</fon=
t></tt></a><tt><font size=3D2><br>&gt;&gt;<br>&gt; <br>&gt; <br><br>=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F<br>Ietf-calsif=
y mailing list<br>Ietf-calsify@osafoundation.org<br></font></tt><a href=3D"=
http://lists.osafoundation.org/mailman/listinfo/ietf-calsify"><tt><font siz=
e=3D2>http://lists.osafoundation.org/mailman/listinfo/ietf-calsify</font></=
tt></a><tt><font size=3D2><br></font></tt><br><br><BR>
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From: "Tim Hare" <TimHare@comcast.net>
To: "'Bernard Desruisseaux'" <bernard.desruisseaux@oracle.com>, "'Eliot Lear'" <lear@cisco.com>
Subject: RE: AD review issue #4: Supporting both VTODO and VEVENT in	thesame iCalendar stream (was: Re: [Ietf-calsify] Re: AD review	on2445bis)
Date: Fri, 4 Jul 2008 16:17:17 -0400
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I can't speak for Lisa, but the export/import scenario is one place where b)
applies.  If by "Internet calendar" you mean an .ics file that is opened via
browser, that is also an 'import' scenario I think. 


Tim Hare
Interested Bystander, Non-Inc.

-----Original Message-----
From: Bernard Desruisseaux [mailto:bernard.desruisseaux@oracle.com] 
Sent: Friday, July 04, 2008 11:06 AM
To: Eliot Lear
Cc: Tim Hare; ietf-calsify@osafoundation.org
Subject: Re: AD review issue #4: Supporting both VTODO and VEVENT in thesame
iCalendar stream (was: Re: [Ietf-calsify] Re: AD review on2445bis)

It's not clear to me what Lisa is suggesting actually.

a) Warning about the fact that components type can be mixed?
b) Not to ignore unsupported component types silently?

Proposed text would be great!

Things that should be noted:

1- iTIP does not allow different component types to be mixed.

2- CalDAV provides means to get only the components types that you want.

As such, in practice we will only see mixed component types in export
scenarios and Internet calendars (aka, webcal).

Cheers,
Bernard

Eliot Lear wrote:
> I believe we have consensus as to Lisa's suggestion.  Any disagreement?
> 
> Eliot
> 
> Tim Hare wrote:
>> As an "informed user" - i.e. not a developer, I definitely support 
>> NON-silent rejection.  I can agree with non-support of certain 
>> components only if I receive some notification;  due to work 
>> requirements I am now journalling my time on some projects, and it 
>> would be good to know if I can't import that data into another tool.
>>
>>
>> Tim Hare
>> Interested Bystander, Non-Inc.
>>
>> -----Original Message-----
>> From: ietf-calsify-bounces@osafoundation.org
>> [mailto:ietf-calsify-bounces@osafoundation.org] On Behalf Of Cyrus 
>> Daboo
>> Sent: Monday, June 16, 2008 12:33 PM
>> To: Lisa Dusseault
>> Cc: ietf-calsify@osafoundation.org; Bernard Desruisseaux
>> Subject: Re: AD review issue #4: Supporting both VTODO and VEVENT in 
>> thesame iCalendar stream (was: Re: [Ietf-calsify] Re: AD review 
>> on2445bis)
>>
>> Hi Lisa,
>>
>> --On June 16, 2008 9:25:14 AM -0700 Lisa 
>> Dusseault<lisa@osafoundation.org>
>> wrote:
>>
>>   
>>>> The suggestion of an implementation note that describes the "common 
>>>> use" of the components and explains that some may be supported and 
>>>> others not is fine. In fact telling implementors that they need to 
>>>> be prepared for another system to reject a component would be good.
>>>>        
>>> I can get behind that.  I'd also like to recommend that systems not 
>>> reject a component silently -- a user needs to know if they imported 
>>> a iCalendar file and lost 50 VJOURNAL components in the process.
>>>      
>>
>> Agreed.
>>
>> Note that iTIP does have a status code for "Unsupported Component" 
>> (3.13) -
>> so informing the originator of the iCalendar data that they are 
>> sending something that is not supported by the recipient is covered by
that.
>>
>> --
>> Cyrus Daboo
>>
>> _______________________________________________
>> Ietf-calsify mailing list
>> Ietf-calsify@osafoundation.org
>> http://lists.osafoundation.org/mailman/listinfo/ietf-calsify
>>
>>
>> _______________________________________________
>> Ietf-calsify mailing list
>> Ietf-calsify@osafoundation.org
>> http://lists.osafoundation.org/mailman/listinfo/ietf-calsify
>>
>>    
> 
> _______________________________________________
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> 





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Subject: Re: AD review issue #4: Supporting both VTODO and VEVENT in	thesame iCalendar stream (was: Re: [Ietf-calsify] Re: AD review	on2445bis)
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It's not clear to me what Lisa is suggesting actually.

a) Warning about the fact that components type can be mixed?
b) Not to ignore unsupported component types silently?

Proposed text would be great!

Things that should be noted:

1- iTIP does not allow different component types to be mixed.

2- CalDAV provides means to get only the components types that you want.

As such, in practice we will only see mixed component types in export 
scenarios and Internet calendars (aka, webcal).

Cheers,
Bernard

Eliot Lear wrote:
> I believe we have consensus as to Lisa's suggestion.  Any disagreement?
> 
> Eliot
> 
> Tim Hare wrote:
>> As an "informed user" - i.e. not a developer, I definitely support
>> NON-silent rejection.  I can agree with non-support of certain components
>> only if I receive some notification;  due to work requirements I am now
>> journalling my time on some projects, and it would be good to know if I
>> can't import that data into another tool.
>>
>>
>> Tim Hare
>> Interested Bystander, Non-Inc.
>>
>> -----Original Message-----
>> From: ietf-calsify-bounces@osafoundation.org
>> [mailto:ietf-calsify-bounces@osafoundation.org] On Behalf Of Cyrus Daboo
>> Sent: Monday, June 16, 2008 12:33 PM
>> To: Lisa Dusseault
>> Cc: ietf-calsify@osafoundation.org; Bernard Desruisseaux
>> Subject: Re: AD review issue #4: Supporting both VTODO and VEVENT in 
>> thesame
>> iCalendar stream (was: Re: [Ietf-calsify] Re: AD review on2445bis)
>>
>> Hi Lisa,
>>
>> --On June 16, 2008 9:25:14 AM -0700 Lisa 
>> Dusseault<lisa@osafoundation.org>
>> wrote:
>>
>>   
>>>> The suggestion of an implementation note that describes the "common
>>>> use" of the components and explains that some may be supported and
>>>> others not is fine. In fact telling implementors that they need to be
>>>> prepared for another system to reject a component would be good.
>>>>        
>>> I can get behind that.  I'd also like to recommend that systems not
>>> reject a component silently -- a user needs to know if they imported a
>>> iCalendar file and lost 50 VJOURNAL components in the process.
>>>      
>>
>> Agreed.
>>
>> Note that iTIP does have a status code for "Unsupported Component" 
>> (3.13) -
>> so informing the originator of the iCalendar data that they are sending
>> something that is not supported by the recipient is covered by that.
>>
>> -- 
>> Cyrus Daboo
>>
>> _______________________________________________
>> Ietf-calsify mailing list
>> Ietf-calsify@osafoundation.org
>> http://lists.osafoundation.org/mailman/listinfo/ietf-calsify
>>
>>
>> _______________________________________________
>> Ietf-calsify mailing list
>> Ietf-calsify@osafoundation.org
>> http://lists.osafoundation.org/mailman/listinfo/ietf-calsify
>>
>>    
> 
> _______________________________________________
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To: Aki Niemi <aki.niemi@nokia.com>
Subject: Re: AD review issue #3: Meaning of RELTYPE parameter value of SIBLING (was: Re: [Ietf-calsify] Re: AD review on 2445bis)
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While I was about to propose that we deprecate SIBLING I found cases 
where it might be handy in the future...

1- Group multiple to-dos that don't have a parent to-do. Not a very 
important use cases I think...

2- When breaking an unbounded recurring events in two events (i.e., the 
truncated unbounded recurring events for past recurrence instances, and 
a new unbounded recurring event for the "new" future recurrence 
instances), it might be useful to link the events together with this 
relationship.

Cheers,
Bernard

Aki Niemi wrote:
> ma, 2008-06-16 kello 10:03 +0300, ext Aki Niemi kirjoitti:
>>> Section 3.2.15: RELTYPE.  What does it mean that a calendar component  
>>> referenced is the SIBLING of this one?  How is a user agent supposed  
>>> to use this information?  Is this parameter ever used except on  
>>> RELATED-TO?  Is it actually in use even there?  Health warnings at  
>>> least.
> 
> Good question. Is there a use case that requires a relationship beyond
> parent-child (which currently is the only *defined* relationship in the
> document anyway)?
> 
> Cheers,
> Aki
> 
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Subject: [Ietf-calsify] Re: AD review issue #2: DIR parameter
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Cyrus Daboo wrote:
> Hi Aki,
> 
> --On June 16, 2008 12:59:12 PM +0300 Aki Niemi <aki.niemi@nokia.com> wrote:
> 
>>> > Section 3.2.6, DIR parameter:  This should be limited to LDAP URLs
>>> > only, if not by requirement then at least by noting that other types
>>> > of URLs are likely to be harmful to interoperability.
>>
>> For maximum interoperability, a mandatory-to-implement choice should be
>> defined. However, is LDAP even widely enough supported in iCalendar
>> implementations to justify this? I suspect vCardDAV URLs could in the
>> future start appearing here as well.
> 
> I think at the very least HTTP/HTTPS needs to be allowed as well.
> 

cid and mid would be needed in the context of iMIP.

Here's a proposal for the mandatory-to-implement:

cid
data (e.g., to embed vCard directly?)
file
ftp
http
https
ldap
mid

Cheers,
Bernard


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Subject: [Ietf-calsify] Re: AD review issue #1: Use of ALTREP
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I don't believe the current proposal is appropriate.

As it stands, the draft (RFC2445 as well) makes it clear that ALTREP is 
only allowed on 6 specific text properties, that is, COMMENT, 
DESCRIPTION, LOCATION, RESOURCES, SUMMARY, and CONTACT. I also believe 
the meaning of ALTREP is already properly defined.

In practice though, I'm not sure there is a single calendar user agent 
that exposes it (i.e., allow an end user to set its value, or make use 
of it).

Finally, the following search on the web will only report two iCalendar 
objects that makes use of ALTREP!

http://www.google.com/search?q=ALTREP+filetype%3Aics

In the past we've discussed limiting the URI schemes allowed for 
CAL-ADDRESS but never got around to it.  Perhaps we should limit the URI 
schemed allowed both for ALTREP and CAL-ADDRESS (two sets) while we're 
at it.

On the other hand, when applications while actually start making use of 
ALTREP, I suspect the media type of the resource being pointed at might 
be the real interop issue (e.g., http URL pointing to an XHTML, HTML, 
PDF, PNG, or JPG document).

Cheers,
Bernard

Eliot Lear wrote:
> Am I correct in that this issue is to be resolved as below?  Are there 
> any objections?
> 
> Eliot
> 
> Lisa Dusseault wrote:
>>
>> On Jun 23, 2008, at 3:49 AM, Aki Niemi wrote:
>>
>>> May I suggest an alternative approach? Since the list of "known" uses of
>>> ALTREP can actually be narrowed down to about three, I think we should
>>> add to the definition of each of these properties exactly what it means
>>> to receive one with the ALTREP parameter that contains an HTTP URL.
>>> Other URIs permitted, but their meaning is undefined. In other words,
>>> document current practice as much as we can, but keep further uses open.
>>>
>>> And then to ALTREP parameter, add the description you propose, as
>>> generic advice to how the parameter should be handled/used.
>>
>> +1
>> _______________________________________________
>> Ietf-calsify mailing list
>> Ietf-calsify@osafoundation.org
>> http://lists.osafoundation.org/mailman/listinfo/ietf-calsify
>>
> 
> 



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To: Oliver Block <lists@block-online.eu>
Subject: Re: [Ietf-calsify] Duration Value Type
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Oliver Block wrote:
> Hello everybody,
> 
> I'd like to draw your attention to the following text:
> 
>      When computing an exact duration, the greatest order time
>      components MUST be added first, that is, the number of weeks MUST
>      be added first, followed by the number of days, number of hours,
>      number of minutes, and number of seconds.
> 
> The syntax is defined as follows:
> 
>        dur-value  = (["+"] / "-") "P" (dur-date / dur-time / dur-week)
> 
>        dur-date   = dur-day [dur-time]
>        dur-time   = "T" (dur-hour / dur-minute / dur-second)
>        dur-week   = 1*DIGIT "W"
>        dur-hour   = 1*DIGIT "H" [dur-minute]
>        dur-minute = 1*DIGIT "M" [dur-second]
>        dur-second = 1*DIGIT "S"
>        dur-day    = 1*DIGIT "D"
> 
> As far as I've understood the meaning of RFC2445 (not the latest draft) 
> and also of the syntax above, the use of week excludes the use of 
> dur-date and also of dur-time. (I don't know if there is a need of a 
> mixed form of in real life time planning.) So if you want to allow 
> dur-week AND dur-date/dur-time within the same value, you need to change 
> the ABNF to, for example
> 
>        dur-value  = (["+"] / "-") "P" [dur-week]  (dur-date / dur-time)
> 
> or for example
> 
>        dur-value  = (["+"] / "-") "P" (dur-date / dur-time / dur-week)
>        ...
>        dur-week   = 1*DIGIT "W" [dur-date]
>        ...
> 
> If not, you need to change the text:
> 
>      When computing an exact duration, the greatest order time
>      components MUST be added first, that is, the number of days MUST
>      be added first, followed number of hours, number of minutes, and 
> number
>      of seconds.

+1

Good catch.

Thanks,
Bernard

> 
> Additionally there could be added an explicit statement if weeks and 
> day/time are both to be used in a Duration value.
> 
> 
> Do you agree?
> 
> 
> Best Regards,
> 
> Oliver Block
> 
> 
> _______________________________________________
> Ietf-calsify mailing list
> Ietf-calsify@osafoundation.org
> http://lists.osafoundation.org/mailman/listinfo/ietf-calsify
> 



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Subject: Re: [Ietf-calsify] VFREEBUSY
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Hi Oliver,

This is issue 67.

http://www.ofcourseimright.com/cgi-bin/roundup/calsify/issue67

Resolution is to disallow DURATION in VFREEBUSY components.
Check logs starting at [12:59:07]:

http://jabber.ietf.org/logs/calsify/2008-03-11.txt

Or the minutes of IETF71:

http://www.ietf.org/proceedings/08mar/minutes/calsify.txt

 > Consensus on issue 67 is to go with option a): Remove statement from
RFC2445bis.

Cheers,
Bernard

Oliver Block wrote:
> Am Freitag, 4. Juli 2008 00:23:28 schrieben Sie:
>> I believe DTSTART and DTEND specify the endpoints of the "specified window
>> of time" and DURATION the amount of time requested, in a free time request.
>>
>> In English "I need to find an hour of your free time sometime between 11:00
>> on 07/03/20008 and 17:00 on 07/11/2008".
> 
> That's a good point. 
> 
> Best Regards,
> 
> Oliver Block
> _______________________________________________
> Ietf-calsify mailing list
> Ietf-calsify@osafoundation.org
> http://lists.osafoundation.org/mailman/listinfo/ietf-calsify
> 



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From: Oliver Block <lists@block-online.eu>
To: "Tim Hare" <TimHare@comcast.net>, ietf-calsify@osafoundation.org
Subject: Re: [Ietf-calsify] VFREEBUSY
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Am Freitag, 4. Juli 2008 00:23:28 schrieben Sie:
> I believe DTSTART and DTEND specify the endpoints of the "specified window
> of time" and DURATION the amount of time requested, in a free time request.
>
> In English "I need to find an hour of your free time sometime between 11:00
> on 07/03/20008 and 17:00 on 07/11/2008".

That's a good point. 

Best Regards,

Oliver Block


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From: "Tim Hare" <TimHare@comcast.net>
To: "'Oliver Block'" <lists@block-online.eu>, <ietf-calsify@osafoundation.org>
Subject: RE: [Ietf-calsify] VFREEBUSY
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I believe DTSTART and DTEND specify the endpoints of the "specified window
of time" and DURATION the amount of time requested, in a free time request.

In English "I need to find an hour of your free time sometime between 11:00
on 07/03/20008 and 17:00 on 07/11/2008". 


Tim Hare
Interested Bystander, Non-Inc.

-----Original Message-----
From: ietf-calsify-bounces@osafoundation.org
[mailto:ietf-calsify-bounces@osafoundation.org] On Behalf Of Oliver Block
Sent: Friday, July 04, 2008 4:46 PM
To: ietf-calsify@osafoundation.org
Subject: [Ietf-calsify] VFREEBUSY

Hello everybody,

In Sec. 3.6.4. you can find the following about the properties dtend and
duration:

1. ABNF:

                   ; the following are OPTIONAL,
                   ; but MUST NOT occur more than once

                   ... / dtend / duration / ...

2. Text:

      In a free time request, these properties can be used
      in combination with the "DURATION" property to represent a request
      for a duration of free time within a specified window of time.


Is it intended that 'dtend' and 'duration' my both occur in a VFREEBUSY
component? Or shouldn't they be mutually exclusive?

Best Regards,

Oliver Block

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From: Oliver Block <lists@block-online.eu>
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Subject: [Ietf-calsify] Duration Value Type
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Hello everybody,

I'd like to draw your attention to the following text:

      When computing an exact duration, the greatest order time
      components MUST be added first, that is, the number of weeks MUST
      be added first, followed by the number of days, number of hours,
      number of minutes, and number of seconds.

The syntax is defined as follows:

        dur-value  = (["+"] / "-") "P" (dur-date / dur-time / dur-week)

        dur-date   = dur-day [dur-time]
        dur-time   = "T" (dur-hour / dur-minute / dur-second)
        dur-week   = 1*DIGIT "W"
        dur-hour   = 1*DIGIT "H" [dur-minute]
        dur-minute = 1*DIGIT "M" [dur-second]
        dur-second = 1*DIGIT "S"
        dur-day    = 1*DIGIT "D"

As far as I've understood the meaning of RFC2445 (not the latest draft) 
and also of the syntax above, the use of week excludes the use of 
dur-date and also of dur-time. (I don't know if there is a need of a 
mixed form of in real life time planning.) So if you want to allow 
dur-week AND dur-date/dur-time within the same value, you need to change 
the ABNF to, for example

        dur-value  = (["+"] / "-") "P" [dur-week]  (dur-date / dur-time)

or for example

        dur-value  = (["+"] / "-") "P" (dur-date / dur-time / dur-week)
        ...
        dur-week   = 1*DIGIT "W" [dur-date]
        ...

If not, you need to change the text:

      When computing an exact duration, the greatest order time
      components MUST be added first, that is, the number of days MUST
      be added first, followed number of hours, number of minutes, and 
number
      of seconds.

Additionally there could be added an explicit statement if weeks and 
day/time are both to be used in a Duration value.


Do you agree?


Best Regards,

Oliver Block




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Subject: [Ietf-calsify] VFREEBUSY
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Hello everybody,

In Sec. 3.6.4. you can find the following about the properties dtend and
duration:

1. ABNF:

                   ; the following are OPTIONAL,
                   ; but MUST NOT occur more than once

                   ... / dtend / duration / ...

2. Text:

      In a free time request, these properties can be used
      in combination with the "DURATION" property to represent a request
      for a duration of free time within a specified window of time.


Is it intended that 'dtend' and 'duration' my both occur in a VFREEBUSY
component? Or shouldn't they be mutually exclusive?

Best Regards,

Oliver Block


