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--NextPart

A New Internet-Draft is available from the on-line Internet-Drafts 
directories.
This draft is a work item of the Centralized Conferencing Working Group of the IETF.

	Title		: Conference Information Data Model for Centralized Conferencing (XCON)
	Author(s)	: O. Novo, et al.
	Filename	: draft-ietf-xcon-common-data-model-04.txt
	Pages		: 71
	Date		: 2007-3-2
	
This document defines an Extensible Markup Language (XML)-based
   conference information data model for centralized conferencing
   (XCON).  A conference object, which can be manipulated using a
   conference control protocol, at a conference server represents a
   particular instantiation of this data model.  The conference
   information data model defined in this document is an extension of
   (and thus, compatible with) the model specified in the Session
   Initiation Protocol (SIP) Event Package for Conference State.

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From xcon-bounces@ietf.org Fri Mar 02 21:20:34 2007
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Per the following, we've updated the Conference User Identifier
document, reflecting the mailing list comments (to which I'll respond
separately).   Per those comments, the approach is to provide general
guidelines rather than prescriptive definition and mapping of the
conference user identifiers within a conferencing system.=20

Any additional feedback is appreciated.  This document is referenced in
the XCON framework as a non-normative reference, but it would still be
good to get feedback on whether this document should be a WG document.

Thanks,
Mary

-----Original Message-----
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A New Internet-Draft is available from the on-line Internet-Drafts=20
directories.


	Title		: A User Identifier for Centralized Conferencing
(XCON)
	Author(s)	: C. Boulton, M. Barnes
	Filename	: draft-boulton-xcon-userid-01.txt
	Pages		: 9
	Date		: 2007-3-1
=09
A conferencing system is defined by "A framework and Data Model for
   Centralized Conferencing" and represents a container for
   administering and managing all conference related information.  The
   conference user concept is introduced in the framework to identify
   the entity participating in a conference and manipulating
   conferencing system related properties.  This document defines a
   Conference User Identifier and provides some guidelines for
   identifying a specific conference user within a conferencing system.
   The document also provides some examples of the logical mapping of
   this conference user identifier to protocol and signaling interface
   specific user identifiers.

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From xcon-bounces@ietf.org Fri Mar 02 21:22:09 2007
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The draft defining a URI for identifying a specific conference object
has also been updated (I don't have the general IETF announcement, so
I'm assuming my spam filter ate it for some reason or I indavertently
deleted while doing my manual spam filtering):
http://www.ietf.org/internet-drafts/draft-boulton-xcon-uri-01.txt

The primary changes in this version were the expansion of the section on
distribution of the identifiers to include discussion of their creation,
considering the cases where users join a conference via signaling
mechanisms such as SIP versus using the conference control protocol.
The security section also has real text now.  It is hopefully also now
clear in the document that the mapping mechanism is not prescriptive for
systems that have other mechanisms to correlate the various signaling
URIs with the XCON URI. =20

While this document isn't entirely complete (IANA registration section
is still empty), it is believed to fairly comprehensive at this point.
As with the user identifier document, this document is a non-normative
reference in the framework, but it would still be good to get feedback
as to whether this document is ready to be accepted as a WG document.

Regards,
Mary=20

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From xcon-bounces@ietf.org Fri Mar 02 21:22:30 2007
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Subject: RE: [XCON] Feedback requested: draft-boulton-xcon-uri-00
Date: Fri, 2 Mar 2007 20:21:43 -0600
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	"Lorenzo Miniero" <rainmaker@libero.it>, <xcon@ietf.org>
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Hi Roni,

Thanks for the comments and I believe that your concerns have been =
reflected in the updated document (i.e., allowing users to join using =
SIP), per comments below [MB]. =20

Mary


-----Original Message-----
From: Even, Roni [mailto:roni.even@polycom.co.il]=20
Sent: Sunday, December 03, 2006 9:15 AM
To: Lorenzo Miniero; xcon@ietf.org
Subject: RE: [XCON] Feedback requested: draft-boulton-xcon-uri-00


Hi,
I read the draft and my view is that the conference object identifier is =
an XCON entity, it may be used for defining the conference name (user =
part) for a signaling protocol like SIP but this is not mandatory. Even =
in the example the conference access using signaling may be done using a =
SIP URI or a Phone number.
The major purpose of the identifier is for the XCON conference object. I =
am not sre it saves something to have a pre-defined mapping since anyhow =
you list the conference call signaling access in the document itself.
[MB] We've clarified that the mapping proposal is an example or =
guideline for an implementation that chooses to do it that way, but it =
is not mandatory.  The text hopefully clarifies that users may join with =
SIP signaling and the the URI is required for the conferencing system =
(and needed by any user that wants to manipulate the conference object). =
[/MB]

Another point to consider is that the conference call signaling access =
(SIP URI, PSTN) may be the same for all conferences when using two stage =
dialing (IVR), it may get a unique identifier only after the conference =
is established but not when it is reserved. See RFC 4579 section 5.3 for =
such a flow for SIP systems.=20
[MB] It is possible that some conferences will use the same blueprint or =
reservation (and thus the same XCON URI), but once the conference is =
active, there would be a unique XCON URI. [/MB]

Roni Even=20

> -----Original Message-----
> From: Lorenzo Miniero [mailto:rainmaker@libero.it]
> Sent: Thursday, November 30, 2006 9:57 PM
> To: xcon@ietf.org
> Subject: Re: [XCON] Feedback requested: draft-boulton-xcon-uri-00
>=20
> Hi Mary,
>=20
> > Per discussions at IETF-67, here's the reminder that we'd like =
feedback
> > on this draft:
> > http://www.ietf.org/internet-drafts/draft-boulton-xcon-uri-00.txt
> >
> > This document defines a URI scheme and syntax for the conference =
object
> > identifier, as defined in "A Framework and Data Model for =
Centralized
> > Conferencing".
> >
> > This identifier has been a fundamental concept in the XCON framework
> > from the beginning and seems quite necessary. I think this draft is
> > fairly complete and the identifier itself is already part of the =
data
> > model, as pointed out by Oscar.
> >
> > So, the questions would be how much more detail is necessary in this
> > document and can it be accepted as a WG document?
> >
> > Regards,
> > Mary
> >
> > _______________________________________________
> > XCON mailing list
> > XCON@ietf.org
> > https://www1.ietf.org/mailman/listinfo/xcon
> >
>=20
>=20
> I absolutely agree on the fact that such an identifier was needed in =
the
> framework, and I'm glad that it has been proposed. What I still don't
> understand after having the draft read, and I take advantage of this =
new
> draft proposal to repeat a question I made some weeks ago on this ML =
and
> got ignored: considering the conference joining matter, will this URI =
be
> directly used to join conferences using a message of the
> soon-to-come-CCP, or will only its unique token be used to compose
> signaling URIs to access conferences using the relative CSP (e.g.
> xcon:123@xxx --> sip:123@xxx)?
> I ask this since I consider the joining method matter very important =
in
> a framework that by definition will (should?) not depend upon a =
specific
> CSP for media, besides the fact that a running XCON conference could =
be
> text-only as well, which would make a CSP almost useless. I personally
> think (and I ask the opinion of you all about that) that it could very
> well be a message of the CCP, which would allow an user to join the
> conference as an 'abstract' object, with no set of resources accessed
> yet (e.g. still no audio/video/text/etc) until the user states its =
will
> to access one or more of them by means of the respective CSP =
(accessing
> the URIs as mapped in this draft), or with some resource always
> available by default upon joining (text, for example) and others that
> can be latterly requested and accessed.
>=20
> Hope to hear from you soon, cheers,
>=20
> Lorenzo
>=20
> --
> Lorenzo Miniero, Junior Researcher
> Dipartimento di Informatica e Sistemistica
> Universit=E0 degli Studi di Napoli "Federico II"
> Via Claudio 21 -- 80125 Napoli (Italy)
> Phone: +390817683821 - Fax: +390817683816
> Email: lminiero@napoli.consorzio-cini.it
>=20
> _______________________________________________
> XCON mailing list
> XCON@ietf.org
> https://www1.ietf.org/mailman/listinfo/xcon
>=20
>=20
>=20
>=20
>=20
> =
*************************************************************************=
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Subject: RE: [XCON] Feedback requested: draft-boulton-xcon-userid-00
Date: Fri, 2 Mar 2007 20:21:49 -0600
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Roni,

Thanks for the feedback, which has been incorporated into the -01.
Hopefully, we've also addressed your last concern around the
display-name by adding that as a recommendation (in section 5).

Mary

-----Original Message-----
From: Even, Roni [mailto:roni.even@polycom.co.il]=20
Sent: Sunday, December 03, 2006 9:28 AM
To: Barnes, Mary (RICH2:AR00); xcon@ietf.org
Cc: cboulton@ubiquity.net
Subject: RE: [XCON] Feedback requested: draft-boulton-xcon-userid-00


Hi
You had the following question in the draft

1. How much normative detail do we need to include in this document for
the conference user identifier?=20
RE: My view is minimum


2. Or are the details of the conference user identifier implementation
specific and we just need to provide examples?=20

RE: Just provide examples that will give some guidelines to how to
specify users that are defined at conference reservation via XCON and
how to give identity to unspecified users who dial the conference and
join.

3. Does the definition require that the mapping to the user ids for
other protocols be obvious (e.g., visibly derivable or would that be
implementation specific?=20

RE: Like question 2, give some guidelines.

In general the user identifier is internal to the XCON document; also be
aware that the user may be unknown when defining the conference, this is
typical for participants who will dial to the conference, their identity
will appear in the conference roster based on something like "asserted
identity".

BTW: What about specifying non-English display names, suggest to add
display name field to the URI.

Roni Even

> -----Original Message-----
> From: Mary Barnes [mailto:mary.barnes@nortel.com]
> Sent: Thursday, November 30, 2006 7:24 PM
> To: xcon@ietf.org
> Cc: cboulton@ubiquity.net
> Subject: [XCON] Feedback requested: draft-boulton-xcon-userid-00
>=20
> Per discussions at IETF-67, here's the reminder that we'd like
feedback
> on this draft:
> http://www.ietf.org/internet-drafts/draft-boulton-xcon-userid-00.txt
>=20
> The conference user concept is introduced in the framework to identify
> the entity participating in a conference and manipulating
> conferencing system related properties.  This document defines a
> Conference User Identifier and syntax for identifying a specific
> conference user within a conferencing system.  The document also
> describes the logical mapping of this conference user identifier to
> protocol and signaling interface specific user identifiers.
>=20
> The questions are around how prescriptive we need to be in XCON
> specifications as to the allocation, distribution and definiton of
this
> identifier or would this all just be purely informational.   This
> concept has been part of the framework from day one and it does seem
to
> be an important concept and something that should be part of the basic
> data model, as well.
>=20
> Regards,
> Mary
>=20
> _______________________________________________
> XCON mailing list
> XCON@ietf.org
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From xcon-bounces@ietf.org Fri Mar 02 21:22:51 2007
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Subject: RE: [XCON] Feedback requested: draft-boulton-xcon-uri-00
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Srivatsa,

Thanks for the feedback.  Detailed responses embedded below [MB].=20

Mary


-----Original Message-----
From: Srivatsa Srinivasan [mailto:srivats@exchange.microsoft.com]=20
Sent: Wednesday, January 03, 2007 2:28 AM
To: Barnes, Mary (RICH2:AR00); xcon@ietf.org
Cc: cboulton@ubiquity.net
Subject: RE: [XCON] Feedback requested: draft-boulton-xcon-uri-00


Hi Mary and Chris,

Sorry for the late comments. Overall, the idea of having a separate
identifier to identify the conference object resource sounds useful. Was
there a reason for using a new scheme based URI instead of a simple
unique identifier? Some text in the introduction to make the motivation
clear would help. Also, do you foresee the XCON URI to be a routable
entity in the future? Perhaps some normative text there regarding its
use would be beneficial?

[MB] I'm not sure we've totally addressed your first concern in the
updated -01, but hopefully the updated document is more complete in
terms of clarifying the usage by the expanded text in section 6.   I
think the idea of using a URI is that it could be routable depending
upon a conferencing system implementation and it seems reasonable to use
a URI from that perspective.  I guess we could add a statement somewhere
in section 3 to explicit state this. [/MB]

More comments follow.

>From Section 3
  " Editors Note: Part of the extension to the Conference Package for
   XCON? "

[SS] The data model and conference package for XCON should have text
describing where an XCON URI may appear in the document. It's usage
should however be specified in this document, the framework and the
conference control protocol if I understand correctly.

[MB] Agreed - we've deleted that Editor's note. [/MB]

>From Section 3.1
"   The left hand side of the URI (to the left of the '@') represents
the
   unique token.  This token can be used by any protocol wishing to gain
   access to functionality associated with a specific conference object.
   For example, when used to construct a SIP INVITE request, the token
   would be used to populate the 'user' part of the SIP URI - as defined
   in RFC 3261[2].  The right hand side of the URI, as with any URI,
   provides domain level information ('example.com' in previous
   example).  So continuing the previous example, the SIP URI domain
   part would be equal to this domain information."

[SS] Is the above text implying that, given an XCON URI, a
client/implementation can construct an equivalent SIP URI by just
parsing out sections from the XCON URI and forming the SIP URI? I think
giving normative detail here with respect to the mapping is quite
unnecessary and may in fact cause inter-op issues (if implemented
incorrectly). Inclusion of these terms should not prevent an
implementation from using SIP URI's instead of XCON URI's all over the
place (in the data model) without breaking normative behavior, correct?

[MB] Hopefully, with the updated text this is clear that this mapping
isn't normative and it's an implementation detail as to how a
conferncing system logically maps things. [/MB]

Srivatsa.


> -----Original Message-----
> From: Mary Barnes [mailto:mary.barnes@nortel.com]
> Sent: Thursday, November 30, 2006 9:25 AM
> To: xcon@ietf.org
> Cc: cboulton@ubiquity.net
> Subject: [XCON] Feedback requested: draft-boulton-xcon-uri-00
>
> Per discussions at IETF-67, here's the reminder that we'd like
feedback
> on this draft:
> http://www.ietf.org/internet-drafts/draft-boulton-xcon-uri-00.txt
>
> This document defines a URI scheme and syntax for the conference
object
> identifier, as defined in "A Framework and Data Model for Centralized
> Conferencing".
>
> This identifier has been a fundamental concept in the XCON framework
> from the beginning and seems quite necessary. I think this draft is
> fairly complete and the identifier itself is already part of the data
> model, as pointed out by Oscar.
>
> So, the questions would be how much more detail is necessary in this
> document and can it be accepted as a WG document?
>
> Regards,
> Mary
>
> _______________________________________________
> XCON mailing list
> XCON@ietf.org
> https://www1.ietf.org/mailman/listinfo/xcon

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From xcon-bounces@ietf.org Fri Mar 02 21:23:17 2007
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Subject: RE: [XCON] Feedback requested: draft-boulton-xcon-userid-00
Date: Fri, 2 Mar 2007 20:21:58 -0600
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Srivatsa,

Sorry for the late reply :)  As far as endpoints being identified, I
think that's already covered in the data model and I don't think it
needs to be addressed in this document.   Or, do folks think that
relationship also needs to be described?=20

Mary


-----Original Message-----
From: Srivatsa Srinivasan [mailto:srivats@exchange.microsoft.com]=20
Sent: Wednesday, January 03, 2007 2:33 AM
To: 'Even, Roni'; Barnes, Mary (RICH2:AR00); xcon@ietf.org
Cc: cboulton@ubiquity.net
Subject: RE: [XCON] Feedback requested: draft-boulton-xcon-userid-00



Sorry for the late comments. Agree with Roni on most of what was said
below. I do not see why the mapping from user identifier to user id has
to be strictly (normatively) specified. The data model could be modified
to include the URIs that correspond to a specific user id. This could be
easily accomplished by simply having a <conf-uris>-like container
element (with the asserted identities for that user) under the <user>
element such that automata can then use the mapping as necessary.

On the same topic, how are endpoints under the user identified? In the
case of SIP, the endpoint entity could be a simple numeric number (an
endpoint id, unique within the conference) and the SIP URI corresponding
to that could be a GRUU. The data model could be modified to include
this SIP URI corresponding to the endpoint id. One use (albeit not
great) of such an id is to use it as the RTP CNAME in cases where the
RTP SSRC cannot be used to indicate active speaker. There could be other
uses as well.

Srivatsa.

> -----Original Message-----
> From: Even, Roni [mailto:roni.even@polycom.co.il]
> Sent: Sunday, December 03, 2006 7:28 AM
> To: Mary Barnes; xcon@ietf.org
> Cc: cboulton@ubiquity.net
> Subject: RE: [XCON] Feedback requested: draft-boulton-xcon-userid-00
>
> Hi
> You had the following question in the draft
>
> 1. How much normative detail do we need to include in this document
for
> the conference user identifier?
> RE: My view is minimum
>
>
> 2. Or are the details of the conference user identifier implementation
> specific and we just need to provide examples?
>
> RE: Just provide examples that will give some guidelines to how to
> specify users that are defined at conference reservation via XCON and
> how to give identity to unspecified users who dial the conference and
> join.
>
> 3. Does the definition require that the mapping to the user ids for
> other protocols be obvious (e.g., visibly derivable or would that be
> implementation specific?
>
> RE: Like question 2, give some guidelines.
>
> In general the user identifier is internal to the XCON document; also
> be
> aware that the user may be unknown when defining the conference, this
> is
> typical for participants who will dial to the conference, their
> identity
> will appear in the conference roster based on something like "asserted
> identity".
>
> BTW: What about specifying non-English display names, suggest to add
> display name field to the URI.
>
> Roni Even
>
> > -----Original Message-----
> > From: Mary Barnes [mailto:mary.barnes@nortel.com]
> > Sent: Thursday, November 30, 2006 7:24 PM
> > To: xcon@ietf.org
> > Cc: cboulton@ubiquity.net
> > Subject: [XCON] Feedback requested: draft-boulton-xcon-userid-00
> >
> > Per discussions at IETF-67, here's the reminder that we'd like
> feedback
> > on this draft:
> > http://www.ietf.org/internet-drafts/draft-boulton-xcon-userid-00.txt
> >
> > The conference user concept is introduced in the framework to
> identify
> > the entity participating in a conference and manipulating
> > conferencing system related properties.  This document defines a
> > Conference User Identifier and syntax for identifying a specific
> > conference user within a conferencing system.  The document also
> > describes the logical mapping of this conference user identifier to
> > protocol and signaling interface specific user identifiers.
> >
> > The questions are around how prescriptive we need to be in XCON
> > specifications as to the allocation, distribution and definition of
> this
> > identifier or would this all just be purely informational.   This
> > concept has been part of the framework from day one and it does seem
> to
> > be an important concept and something that should be part of the
> basic
> > data model, as well.
> >
> > Regards,
> > Mary
> >
> > _______________________________________________
> > XCON mailing list
> > XCON@ietf.org
> > https://www1.ietf.org/mailman/listinfo/xcon
> >
> >
> >
> >
> >
> >
>
***********************************************************************
> *
> **
> > **********
> > This footnote confirms that this email message has been scanned by
> > PineApp Mail-SeCure for the presence of malicious code, vandals &
> computer
> > viruses.
> >
>
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> *
> **
> > **********
> >
> >
>
>
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From xcon-bounces@ietf.org Mon Mar 05 05:32:39 2007
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	"Gonzalo Camarillo \(JO/LMF\)" <gonzalo.camarillo@ericsson.com>
Subject: [XCON] Re: FW: [Fwd: Re: Elements in the data model]
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Oscar Novo (JO/LMF) ha scritto:
> Hi Simon Pietro,
>=20
> Here, I send you some comments. Before to put put a new revision of the
> draft I would like to know your opinion for the last comments.
>=20
> Regards,
>=20
> Oscar
>=20


Hi Gonzalo and Oscar,

we're glad you found our comments useful in refining your document.=20
We've read the updated draft you sent us, and we think it's a good step=20
forward.

We're putting the Mailing List in copy to this message, since we think=20
it can be of interest to the ongoing discussion upon the data model.

Regarding your reply to our previous mail, you'll find our new comments=20
inline ([S&L&T] as Simon, Lorenzo and Tobia).


>> -------- Original Message --------
>> Subject: Re: Elements in the data model
>> Date: Tue,  6 Feb 2007 12:44:43 +0100
>> From: Simon Pietro Romano <spromano@unina.it>
>> To: Gonzalo Camarillo <Gonzalo.Camarillo@ericsson.com>
>> CC: lorenzo.miniero@unina.it, tobia.castaldi@unina.it,        Alfonso=20
>> <al.buono@criai.it>
>> References: <45B85AE1.3080606@ericsson.com>
>>
>> Dear Gonzalo,
>>
>> sorry for the late response...as you know we've been working on the
> editing of the DCON drfat proposals during these last days.
>> Please find in the following our considerations about the data model.=20
>> Take them
>> as suggestions for improvement and keep in mind that probably many of
> our concerns might disappear with a face-to-face clarification. I'm sur=
e
> the upcoming version of the draft is on the right track and helps
> satisfy most of the "desiderata" expressed by the group. I keep on
> thinking that the data model is the hardest part of the design work for
> any project.
>> We've checked the data model you sent us, analyzing the elements
> marked with an '*' as you suggested, so in the following lines we'll
> provide you with our thoughts and suggestions about them.
>> Comments inline.
>>
>>> !<conference-info>
>>>       |
>>>       |--!<conference-description>
>>>       |     |--<display-text>
>>>       |     |--<subject>
>>>       |     |--<free-text>*
>> We think this can stay.
>>
>>>       |     |--<keywords>
>>>       |     |--<web-page>*
>> This too, even if it would probably fit better in some child element
> of
>> <service-uris>: this way you could have a more detailed list of
> web-pages related to different conference-related services, instead of
> the only one that's reported here.
>> [Gonzalo&Oscar] We have removed this element from this part of the
> data model.
>>>       |     |--<security-level>*
>> This is a little vague and too complex to concentrate in a single
> element. It should probably be elaborated. An idea could be removing it
> for the moment, and leaving it to future extensions where this matter,
> which is a very important and sensitive one, could be deeply considered.
>> [Gonzalo&Oscar] Agree. That's too vague. We have removed this element
> from this part of the data model.
>>>       |     |--<allow-sidebars>*
>> This is fine, even if it would probably fit better in the related
> sidebars section later, but it's just an idea.
>> [Gonzalo&Oscar] we still think this element is fine as a child element
> of the <conference-description> element. The sidebar-by-ref and
> sidebar-by-val sections are not inside any global sidebar element just
> for backward compatibility with RFC 4575.


[S&L&T] That's okay then.


>>>       |     |--<conference-stage>*
>> Is this a typo for <conference-state> or is it <conference-stage>? It
> should be described better, but it probably is fine to let it stay.
>> [Gonzalo&Oscar] It wasn't a typo but we've decided to remove it
> because it wasn't clear the propose of this element.=20
>>>       |     |--<conference-time>*
>>>       |     |      |--<entry>*
>>>       |     |      |    |--<base>*
>>>       |     |      |    |--<mixing-start-offset>*
>>>       |     |      |    |--<mixing-end-offset>*
>>>       |     |      |    |--<can-join-after-offset>*
>>>       |     |      |    |--<must-join-before-offset>*
>>>       |     |      |    |--<request-user>*
>>>       |     |      |    |--<notify-end-of-conference>*
>>>       |     |      |    |--<allowed-extend-mixing-end-offset>*
>> We think that this one, as the security-related element before, should
> be better elaborated and analyzed. You could leave the <base> as a stub=
,
> and furtherly enhance and improve it in later extensions.
>> [Gonzalo&Oscar] we have read this section again and we can't see what
> is not clear, we need a bit more help from you. what exactly you don't
> understand from the text? Which element is not clear enough? Maybe, do
> you have in mind a better text to put in the draft?


[S&L&T] <base> is surely enough to handle scheduled conferences and=20
their optional recurrency, being it an iCal object. As to the rest,=20
<can-join-after-offset>, <must-join-after-offset> and=20
<notify-end-of-conference> are useful entries, but we don't see the=20
point of having the others in this data model, if it really means to be=20
only a base for future extensions.


>>>       |     |           ...
>>>       |     |--<conf-uris>
>>>       |     |      |--<SIP>*
>>>       |     |      |    |--<uri>
>>>       |     |      |    |--<display-text>
>>>       |     |      |    |--<purpose>
>>>       |     |      |--<H323>*
>>>       |     |      |    |--<H.323-alias>*
>>>       |     |      |    |--<H.323-URI>*
>>>       |     |      |--<PSTN-ISDN>*
>>>       |     |      |    |--<phone number>*
>>>       |     |      |    |--<PIN-code>*
>>>       |     |      |    |--<purpose>*
>>>       |     |      |    |--<rate>*
>>>       |     |      ...
>> The ones that are reported are fine but there only are CSP (Call
> Signaling Protocol) URIs. Will other media URIs be put here as well?
>> We're thinking about IM-related resources, as Jabber channels that
> could be associated with the conference for text, or any other URI
> related to any media that could be available in the conference (e.g.
>> whiteboarding). This is more a question than a suggestion, of course,
> and it can be left to future study and extensions.
>> [Gonzalo&Oscar] yes, other media URIs should be put in this section
> (such Jabber), not only CSP.
>>
>>>       |     |--<service-uris>
>>>       |     |      |--<SIP>*
>>>       |     |      |    |--<uri>
>>>       |     |      |    |--<display-text>
>>>       |     |      |    |--<purpose>
>>>       |     |      |--<H323>*
>>>       |     |      |    |--<H.323-alias>*
>>>       |     |      |    |--<H.323-URI>*
>>>       |     |      |--<PSTN-ISDN>*
>>>       |     |      |    |--<phone number>*
>>>       |     |      |--<BFCP>*
>>>       |     |      |    |--<conference-ID>*
>>>       |     |      ...
>> The BFCP ConferenceID should be removed from here and put in
> <floor-information> instead, where it would probaby fit much better. An=
d
> as we suggested before, maybe also web-related URLs as the conference
>> web-page(s) would stay better here than where they are now.
>>
>> [Gonzalo&Oscar] we have moved the conferenceID to the
> <floor-information> element.
>>>       |     |--<maximum-user-count>
>>>       |     |      |--<entry>*
>>>       |     |      |--<entry>*
>>>       |     |      ...
>> This is fine where it is but the <entry> child is not described well
> enough. What will it contain? Will it have subchilds, and if so, which
> ones?
>> [Gonzalo&Oscar] we have removed the <entry> child element from the
> <maximum-user-count> element to have it align with RFC 4575.=20
>>>       |     |--<maximum-streams>*
>>>       |     |      |--<entry>*
>>>       |     |      |--<entry>*
>>>       |     |      ...
>> This is too mixing-related in our opinion, and so it would probably be
> better removing it for now and leaving it to future extensions. This
> would allow better coordination with the work currently carried out by
> the MediaCtrl WG, which could give us all a clearer view on what is
> needed by the AS about mixing.
>> [Gonzalo&Oscar] we have removed the <maximum-streams> element from the
> data model.
>>>       |     |--!<available-media>
>>>       |     |      |--!<entry>
>>>       |     |      |     |--<type>
>>>       |     |      |     |--<display-text>
>>>       |     |      |     |--<status>
>>>       |     |      |     |--<mixing-mode>*
>>>       |     |      |     |--<mix-level>*
>>>       |     |      |     |--<codecs>*
>>>       |     |      |     |    |--<entry>*
>>>       |     |      |     |    |--<entry>*
>>>       |     |      |     |    ...
>>>       |     |      |     |--<controls>*
>>>       |     |      |     |    |--<mute>*
>>>       |     |      |     |    |--<gain>*
>>>       |     |      |     |   ...
>> Same as before, the mixing-related matter is a little too vague at the
> moment.
>> [Gonzalo&Oscar] Exactly which element is too vague at the moment?
> <mixing-mode>? <mix-level>? We can remove them if they are not enough
> clear.


[S&L&T] Having basic controls for media is absolutely fine, but only as=20
long as they keep being an abstraction to be laterly bound to the=20
underlying mixing layer, whatever and however this is made.=20
<mixing-mode> and <mix-level> are a bit too mixing-oriented to meet this=20
requirement, while <codecs> should be kept at best as informative only,=20
read-only entries, and left to the CSP negotiation while joining a=20
conference. Some similar issues were raised by Srivatsa Srinivasan too=20
in a mail on the ML a couple of months ago.


>>>       |     |      |--<entry>
>>>       |     |      |     |--<type>
>>>       |     |      |     |--<display-text>
>>>       |     |      |     |--<status>
>>>       |     |      |     |--<mixing-mode>*
>>>       |     |      |     |--<mix-level>*
>>>       |     |      |     |--<codecs>*
>>>       |     |      |     |    |--<entry>*
>>>       |     |      |     |    |--<entry>*
>>>       |     |      |     |    ...
>>>       |     |      |     |--<controls>*
>>>       |     |      |     |    |--<pause-video>*
>>>       |     |      |     |    |--<video-layout>*
>>>       |     |      |     |   ...
>> Idem.
>>
>>>       |     |      ...
>>>       |
>>>       |--<host-info>
>>>       |     |--<display-text>
>>>       |     |--<web-page>
>>>       |     |--!<uris>
>>>       |     |     |--!<SIP>*
>>>       |     |     |    |--!<uri>*
>>>       |     |     |    |--<display-text>*
>>>       |     |     |    |--<purpose>*
>>>       |     |     |--<H323>*
>>>       |     |     |    |--<H.323-alias>*
>>>       |     |     |    |--<H.323-URI>*
>>>       |     |     |--<PSTN-ISDN>*
>>>       |     |     |    |--<phone number>*
>>>       |           ...
>> What difference is there between these URIs and the ones that have
> been reported before? Anyway, the observations are the same as the ones
> we made for the URIs before.
>> [Gonzalo&Oscar] This element contains information about the entity
> hosting the conference. <conf-uris> contains the URI to be used in orde=
r
> to access the conference.
>>
>>>       |--<conference-state>
>>>       |     |--<allow-conference-state>*
>> We read on the draft that this element is related to the possibility
> to subscribe to the conference event package. If so, it is probably fin=
e
> where it is, but a clearer name (e.g.
>> <allow-conference-event-subscription>) wouldn't hurt, since the
> current name can be confusing.
>> [Gonzalo&Oscar] yes, the name you suggest is much more clear. Good
> point. We have change it.=20
>>>       |     |--<user-count>
>>>       |     |--!<active>
>>>       |     |--<locked>
>>>       |
>>>       |--<floor-information>*
>>>       |     |--<allow-floor-events>*
>>>       |     |--<floor-request-handling>*
>>>       |     |--<conference-floor-policy>*
>>>       |     |     |--<floor>*
>>>       |     |     |    |--<media-types>*
>>>       |     |     |    |--<algorithm>*
>>>       |     |     |    |--<max-floor-users>*
>>>       |     |     |    |--<moderator-uri>*
>>>       |     |     |    |--<moderator-uri>*
>>>       |     |     |   ...
>>>       |     |     ...
>> As we suggested befre, the BFCP ConferenceID that crrently sits in the
> service URIs should be moved somewhere in here, where it surely is its
> place.=20
>> [Gonzalo&Oscar] yes, now it's where you suggested=20
>>
>> Regarding the existing elements, what exactly is the <moderator-uri>?
> Is it a CSP-related URI or a BFCP UserID?=20
>> [Gonzalo&Oscar] BFCP UserID
>>
>> It would probably be better having it be the second, rather than the
> first, and thus having its name be something like <chair-id> or the
> like. The rest is fine, other policies can be added in future
> extensions.
>> [Gonzalo&Oscar] we have change the name of moderator-uri to chair-id.
>>
>>>       |
>>>       |--!<users>
>>>       |     |--<join-handling>*
>>>       |     |--<user-admission-policy>*
>>>       |     |--<allowed-users-list>*
>>>       |     |     |--<target>*
>>>       |     |     |-- ...
>> <join-handling> and <user-admission-policy> are somewhat confusing and
> overlapping concepts: it could be a good idea finding a way to merge
> them together, unless they explicitely refer to different and separate
> matters.


[S&L&T] About this, their difference is clearer now. However,=20
<join-handling> envisages the possibility of having a PIN-driven access=20
to the conference by means of IVR interaction. But where is this PIN=20
stored in the data model, if needed?


>>
>>>       |     |
>>>       |     |--<privileges-control-list>*
>>>       |     |    |--<conference-rules>*
>>>       |     |    |     |--<entry>*
>>>       |     |    |     |     |--<condition>*
>>>       |     |    |     |     |     |--<identity>*
>>>       |     |    |     |     |     |     |
>>>       |     |    |     |     |     |     ...
>>>       |     |    |     |     |     |
>>>       |     |    |     |     |     |--<validity>*
>>>       |     |    |     |     |     |     |--<from>*
>>>       |     |    |     |     |     |     |--<until>*
>>>       |     |    |     |     |
>>>       |     |    |     |     |--<actions>*
>>>       |     |    |     |     |     |
>>>       |     |    |     |     |     ...
>>>       |     |    |    ...
>> Since you just proposed the new discussion about policies on the WG
> Mailing List, it may be better waiting for what will come out from the
> discussion before putting policy-related stuff in the data model that
> could be latterly rejected, thus leaving the matter to future
> extensions.
>> [Gonzalo&Oscar] we have removed the <privileges-control-list> from the
> new version of the draft.
>>>       |     |
>>>       |     |--!<user>
>>>       |     |    |--<display-text>
>>>       |     |    |--<associated-aors>
>>>       |     |    |--<provide-anonymity>*
>> This <provide-anonimity> is a little confuse, it should be better
> explained and elaborated, otherwise it would be better to remove it for
> the moment.
>> [Gonzalo&Oscar] we have try to explain a bit better this element.
> Please, tell us if now it's a bit more clear.


[S&L&T] It is a bit clearer now, though it still presents some=20
ambiguity. The draft states: "the focus provides to the rest of the=20
participants an anonymous identity for that user, for example=20
anonymousX". What is not clear is: does this 'masquerading' also affects=20
the way the user information is stored in the data model as a whole, or=20
only its appearance to other users requesting or being notified about=20
it? To be more precise, is the real information about the user stored in=20
the data model, and then faked when this information needs to be shown=20
to the outside, or is the user completely anonymized directly in the=20
data model itself?


>>>       |     |    |--<roles>
>>>       |     |    |    |
>>>       |     |    |   ...
>>>       |     |    |--<languages>
>>>       |     |    |--<cascaded-focus>
>>>       |     |    |--<sphere>*
>> Why calling this <sphere> instead of <state>?
>>
>> [Gonzalo&Oscar] We have remove sphere from the data model. It was too
> vague.
>>>       |     |    |--<allow-refer-users-dynamically>*
>>>       |     |    |--<allow-invite-users-dynamically>*
>>>       |     |    |--<allow-remove-users-dynamically>*
>>>       |     |    |--!<endpoint>
>>>       |     |    |      |--<display-text>
>>>       |     |    |      |--<referred>
>>>       |     |    |      |--<status>
>>>       |     |    |      |--<joining-method>
>>>       |     |    |      |--<joining-info>
>>>       |     |    |      |--<disconnection-method>
>>>       |     |    |      |--<disconnection-info>
>>>       |     |    |      |--!<media>
>>>       |     |    |      |    |--<type>
>>>       |     |    |      |    |--<display-text>
>>>       |     |    |      |    |--<label>
>>>       |     |    |      |    |--<src-id>
>>>       |     |    |      |    |--<status>
>>>       |     |    |      |    |--<to-mixer>*
>>>       |     |    |      |    |      |--<floor>*
>> This <floor> is probably out of place here, since all the
> floor-related information has its own element that takes care of all
> media associations as well, and consistency and alignment problems coul=
d
> arise.
>> [Gonzalo&Oscar] the floor-information element gives general
> information about the floors in the conference. This <floor> element
> just said if a user has a floor or not in a media stream. So, it's
> related to every user.


[S&L&T] As long as it is read-only, then it's fine. Otherwise, it could=20
give more than a problem in real scenarios.


>>>       |     |    |      |    |      |--<controls>*
>>>       |     |    |      |    |      |      |--<mute>*
>>>       |     |    |      |    |      |      |--<gain>*
>>>       |     |    |      |    |      |     ...
>>>       |     |    |      |    |--<from-mixer>*
>>>       |     |    |      |    |      |--<floor>*
>> Same as before.
>>
>>>       |     |    |      |    |      |--<controls>*
>>>       |     |    |      |    |      |      |--<pause-video>*
>>>       |     |    |      |    |      |     ...
>> See above about mixing.
>>
>> [Gonzalo&Oscar] we have discuss already in the XCON WG that we provide
> some basic controls in the data model (audio and video), even though
> that the information is a bit vague.


[S&L&T] As we stated before, having basic controls for media is=20
absolutely fine, but only as long as they keep being an abstraction to=20
be laterly bound to the underlying mixing layer, whatever and however=20
this is made. In this case, the controls you've put in the data model=20
are probably fine.


>>>       |     |    |      |   ...
>>>       |     |    |      |--<call-info>
>>>       |     |    |      |    |--<sip>*
>>>       |     |    |      |    |   |--<display-text>
>>>       |     |    |      |    |   |--<call-id>
>>>       |     |    |      |    |   |--<from-tag>
>>>       |     |    |      |    |   |--<to-tag>
>> What is this <sip> element here? It should be better described, we
> sincerely don't know what it is and if it should stay or not.
>> [Gonzalo&Oscar] sorry, we haven't modify anything about this element,
> we have removed the * from the new version. This element is described i=
n
> RFC 4575. That's why here we don't describe it again.


[S&L&T] Then it could probably be a good idea extending it to other CSPs=20
too, by adding new entries to cover H.323, PSTN and the like. Or, even=20
better, add a generic element that has the protocol as attribute, to=20
make it easily extendible for new protocol entries; this suggestion=20
applies to other sections where different protocols appear as well.


>>>       |          ...    ...
>>>       |--<sidebars-by-ref>
>>>       |     |--<entry>
>>>       |     |     |-- <user>
>>>       |     |     |-- <display-text>
>>>       |     |--<entry>
>>>       |     |     |-- <user>
>>>       |     |     |-- <display-text>
>>>       |     ...
>>>       |--<sidebars-by-val>
>>>       |     |--<entry>
>>>       |     |     |
>>>       |     |    ...
>>>       |     |--<entry>
>>>       |     |     |
>>>       |     ...   ...
>> That's all! If you have any doubt or question regarding any of our
> points, feel absolutely free to ask.
>> We're looking forward to receiving your comments, and we hope a new
> version of the data model will come out soon.
>> Cheers,
>>
>> Simon, Lorenzo and Tobia


To conclude, we found some small typos and possible errors while reading=20
the draft:

3.2.1:
A "could used" and "withing" can be found in the text.

3.2.1.1:
The chair is presented as a role which can grant a floor, which is=20
incorrect. A chair can only accept requests, which are however then=20
subject to the FCS queues and policies before they can be granted. About=20
this, we take advantage of this point to raise a possible problem in the=20
BFCP draft: should it be possible for the chair to reorder a queue in=20
the FCS by means of a new ChairAction with an ACCEPTED state in it? a=20
ChairAction that would update a previous ACCEPTED one. Think for example=20
about a chair wanting a participant, who is currently fourth in queue,=20
to actually be the next person to be granted a floor: a new ChairAction=20
imposing a 1st position in queue would have this result. However, such a=20
feature is not envisaged in the BFCP draft, so it is not clear wheter it=20
should be actually possible or not, since it would invasively override=20
the local FCS queue policies and algorithms.

3.2.1.2:
This section states that "the user can join a new floor in a different=20
role." Is this a typo for "join a new conference"?

4.1.3:
The <service-uris> description still has the <BFCP> element in it, while=20
it has been removed.


That's all, we hope this second round of comments will help you=20
completing the refining of the document.
We're looking forward to receiving new comments, both from you and from=20
the WG, in case doubts or concerns about any of our points should come ou=
t.

Cheers,

Simon, Lorenzo and Tobia

--=20
Lorenzo Miniero, Junior Researcher
Dipartimento di Informatica e Sistemistica
Universit=E0 degli Studi di Napoli "Federico II"
Via Claudio 21 -- 80125 Napoli (Italy)
Phone: +390817683821 - Fax: +390817683816
Email: lorenzo.miniero@unina.it

_______________________________________________
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Hi Mary,


> Hi Lorenzo,
>=20
> Thanks for the feedback.  Hopefully, your concerns have been addressed =
in the updated document, per my comments below [MB].  If not, let us know.
>=20
> Mary


I'm glad my doubts have helped you in improving the document.
My comment is inline [LM].


> I absolutely agree on the fact that such an identifier was needed in th=
e=20
> framework, and I'm glad that it has been proposed. What I still don't=20
> understand after having the draft read, and I take advantage of this ne=
w=20
> draft proposal to repeat a question I made some weeks ago on this ML an=
d=20
> got ignored: considering the conference joining matter, will this URI b=
e=20
> directly used to join conferences using a message of the=20
> soon-to-come-CCP, or will only its unique token be used to compose=20
> signaling URIs to access conferences using the relative CSP (e.g.=20
> xcon:123@xxx --> sip:123@xxx)?
> [MB] I think it is possible to use this URI to directly join a conferen=
ce (e.g., moderator sets up
> the conference and sends the URI in a link for others to join the confe=
rence).  Although, per Roni's comments the more normal case (at least ini=
tially) would be for users to join using one of the signaling protocols. =
Hopefully, the updated text reflects both options. [/MB]


[LM] Yes, I agree with you. About the mapping not to be mandatory, as=20
Roni pointed out, I agree with him as well, but it should however be a=20
recommended behaviour (i.e. a guideline, as the text correctly suggests)=20
to avoid confusion and potential URI conflicts.


>=20
> I ask this since I consider the joining method matter very important in=
=20
> a framework that by definition will (should?) not depend upon a specifi=
c=20
> CSP for media, besides the fact that a running XCON conference could be=
=20
> text-only as well, which would make a CSP almost useless. I personally=20
> think (and I ask the opinion of you all about that) that it could very=20
> well be a message of the CCP, which would allow an user to join the=20
> conference as an 'abstract' object, with no set of resources accessed=20
> yet (e.g. still no audio/video/text/etc) until the user states its will=
=20
> to access one or more of them by means of the respective CSP (accessing=
=20
> the URIs as mapped in this draft), or with some resource always=20
> available by default upon joining (text, for example) and others that=20
> can be latterly requested and accessed.
> [MB] I fully agree with what you're saying and hopefully you can agree =
that the updated document reflects this sort of functionality (e.g., the =
whole reservation concept matches this idea of an 'abstract' object if I =
understand correctly).  If not, please propose text so that we can ensure=
 that it is clear [In my mind, it's infinitely clear based on the FW, but=
 it's still possible we don't have=20
> enough words in this document]. [/MB]


[LM] Yes, I've seen you've added a lot of text for this in the section=20
regarding the conference object identifier creation and distribution,=20
which I completely agree with. I think it will be even clearer as soon=20
as your promising draft on the CCMP will progress. Until then, limiting=20
the join matter exclusively to CSP is fine.


Cheers,
Lorenzo

--=20
Lorenzo Miniero, Junior Researcher
Dipartimento di Informatica e Sistemistica
Universit=E0 degli Studi di Napoli "Federico II"
Via Claudio 21 -- 80125 Napoli (Italy)
Phone: +390817683821 - Fax: +390817683816
Email: lorenzo.miniero@unina.it

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--NextPart

A New Internet-Draft is available from the on-line Internet-Drafts 
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This draft is a work item of the Centralized Conferencing Working Group of the IETF.

	Title		: Connection Establishment in the Binary Floor Control Protocol (BFCP)
	Author(s)	: G. Camarillo
	Filename	: draft-ietf-xcon-bfcp-connection-04.txt
	Pages		: 10
	Date		: 2007-3-5
	
This document specifies how a Binary Floor Control Protocol (BFCP)
   client establishes a connection to a BFCP floor control server
   outside the context of an offer/answer exchange.  Client and server
   authentication are based on Transport Layer Security (TLS).

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From xcon-bounces@ietf.org Mon Mar 05 17:05:59 2007
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We've updated the draft describing MSRP conferencing:
http://www.ietf.org/internet-drafts/draft-boulton-xcon-msrp-conferencing
-04.txt

The primary changes were updating references and adding alot of content
describing the basic (create, join, delete) and advanced (Text sidebars
and private messaging).

Feedback would be appreciated. =20

Regard,
Mary=20

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We have submitted the 04 version of the data model draft, you can fetch
now the new version here:

http://users.piuha.net/gonzalo/temp/draft-ietf-xcon-common-data-model-04
.txt

Comments are welcome. :)

Thanks in advance,

Oscar Novo

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An updated version of the media usages draft has been submitted.

http://www.ietf.org/internet-drafts/draft-srinivasan-xcon-usecases-mediausa=
ge-01.txt

Comments welcome,
Srivatsa.

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From: Srivatsa Srinivasan <srivats@exchange.microsoft.com>
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A conference event package extensions draft has been submitted. The documen=
t defines a new MIME type as a result of the discussions from the previous =
IETF to resolve a few inconsistencies that existed with the SIP conference =
event package. More inside the document.

http://www.ietf.org/internet-drafts/draft-srinivasan-xcon-eventpkg-extensio=
ns-00.txt

Comments welcome,
Srivatsa.


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Subject: [XCON] Last Call: draft-ietf-xcon-bfcp-connection (Connection 
 Establishment in the Binary Floor Control Protocol (BFCP)) to 
 Proposed Standard 
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The IESG has received a request from the Centralized Conferencing WG 
(xcon) to consider the following document:

- 'Connection Establishment in the Binary Floor Control Protocol 
  (BFCP) '
   <draft-ietf-xcon-bfcp-connection-04.txt> as a Proposed Standard

The IESG plans to make a decision in the next few weeks, and solicits
final comments on this action.  Please send substantive comments to the
ietf@ietf.org mailing lists by 2007-03-31. Exceptionally, 
comments may be sent to iesg@ietf.org instead. In either case, please 
retain the beginning of the Subject line to allow automated sorting.

The file can be obtained via
http://www.ietf.org/internet-drafts/draft-ietf-xcon-bfcp-connection-04.txt




IESG discussion can be tracked via
https://datatracker.ietf.org/public/pidtracker.cgi?command=view_id&dTag=14102&rfc_flag=0


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From: Cullen Jennings <fluffy@cisco.com>
Date: Sat, 10 Mar 2007 12:49:53 -0800
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It's hard to read this draft and have enough context to fully  
understand what is going on here - a bit more background would  
probably help people understand it better.

Cullen

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From xcon-bounces@ietf.org Mon Mar 12 08:58:27 2007
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Date: Mon, 12 Mar 2007 14:58:12 +0200
From: Gonzalo Camarillo <Gonzalo.Camarillo@ericsson.com>
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Subject: [XCON] Policies in the data model
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Hi,

the biggest open issue in the data model is policies. We need to decide:

1) whether policies (e.g., who can perform certain tasks like adding or 
removing a user) are in or out of the data model's scope.

2) if they are in scope, whether we follow a syntactic (e.g., user A can 
modify element <foo>) or semantic (e.g., user A can add new users to the 
conference) approach.

3) the granularity to use. Whether to have pre-defined roles where 
higher roles are authorized to perform a super set of the operations 
performed by lower roles, or to have groups of users (similar to Unix 
groups).

I would like to encourage people to discuss these issues because, 
otherwise, it will be impossible to make any progress on this field.

Cheers,

Gonzalo


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From xcon-bounces@ietf.org Mon Mar 12 09:04:05 2007
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From: Henning Schulzrinne <hgs@cs.columbia.edu>
Subject: Re: [XCON] Policies in the data model
Date: Mon, 12 Mar 2007 09:03:46 -0400
To: Gonzalo Camarillo <Gonzalo.Camarillo@ericsson.com>
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I'll add that it might be interesting to look at the policy work in  
SIMPLE (common policy, etc.). It takes somewhat of a middle ground,  
with both more semantically oriented permissions and some operations  
that are closer to XML elements, although it probably tries to stay  
on the semantic side rather than, say, specifying Xpaths as permissions.

In my personal opinion, it is very hard to make syntactic permissions  
work well, simply because one often wants to express permissions that  
span multiple elements and that only make sense if expressed as a  
whole. Also, syntactic permissions can easily yield meaningless or  
illegal operations ("remove the parent element that is required").

On Mar 12, 2007, at 8:58 AM, Gonzalo Camarillo wrote:

> Hi,
>
> the biggest open issue in the data model is policies. We need to  
> decide:
>
> 1) whether policies (e.g., who can perform certain tasks like  
> adding or removing a user) are in or out of the data model's scope.
>
> 2) if they are in scope, whether we follow a syntactic (e.g., user  
> A can modify element <foo>) or semantic (e.g., user A can add new  
> users to the conference) approach.
>
> 3) the granularity to use. Whether to have pre-defined roles where  
> higher roles are authorized to perform a super set of the  
> operations performed by lower roles, or to have groups of users  
> (similar to Unix groups).
>
> I would like to encourage people to discuss these issues because,  
> otherwise, it will be impossible to make any progress on this field.
>
> Cheers,
>
> Gonzalo
>
>
> _______________________________________________
> XCON mailing list
> XCON@ietf.org
> https://www1.ietf.org/mailman/listinfo/xcon


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Subject: RE: [XCON] Policies in the data model
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Hi,

the biggest open issue in the data model is policies. We need to decide:

1) whether policies (e.g., who can perform certain tasks like adding or=20
removing a user) are in or out of the data model's scope.

[Chris Boulton] My feeling is that this should be included in the Data
Model.

2) if they are in scope, whether we follow a syntactic (e.g., user A can

modify element <foo>) or semantic (e.g., user A can add new users to the

conference) approach.

[Chris Boulton] I lean towards a semantic approach simply as it allows
us to model the policies and permissions more accurately - in the scope
of use.

3) the granularity to use. Whether to have pre-defined roles where=20
higher roles are authorized to perform a super set of the operations=20
performed by lower roles, or to have groups of users (similar to Unix=20
groups).

[Chris Boulton] To be honest, I'd only ever considered the inheritance
mechanism.  Now that you mention a 'groups' style that might also be
quite flexible.  It would allow specific inclusion/exclusion for
specific tasks etc. - rather than just relying on inheritance of a
lesser role.

Chris.




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From xcon-bounces@ietf.org Mon Mar 12 11:06:12 2007
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From: Simon Pietro Romano <spromano@unina.it>
To: Gonzalo Camarillo <Gonzalo.Camarillo@ericsson.com>
Subject: Re: [XCON] Policies in the data model
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Hi Gonzalo,

I personally have a general concern with respect to this point. By genera=
l I
mean that I think that all what concerns rights, roles, constraints etc s=
hould
be kept outside of both the data model and the conference control protoco=
l
inner
structure. All these things relate to policy management as a whole and sh=
ould
be dealt with through the adoption of an integrated (as well as orthogona=
l to
the data model definition process) approach like XACML, which has been
conceived exactly for this purpose.

Cheers,

Simon
--=20
                            _\\|//_
                            ( O-O )
   ~~~~~~~~~~~~~~~~~~~~~~o00~~(_)~~00o~~~~~~~~~~~~~~~~~~~~~~~~
                    Simon Pietro Romano
              Universita' di Napoli Federico II
                 Computer Science Department=20
        Phone: +39 081 7683823 -- Fax: +39 081 7684219
                e-mail: spromano@unina.it

    <<Molti mi dicono che lo scoraggiamento =E8 l'alibi degli=20
   idioti. Ci rifletto un istante; e mi scoraggio>>. Magritte.
                         oooO
   ~~~~~~~~~~~~~~~~~~~~~~(   )~~ Oooo~~~~~~~~~~~~~~~~~~~~~~~~~
                          \ (    (   )
                           \_)    ) /
                                 (_/




Scrive Gonzalo Camarillo <Gonzalo.Camarillo@ericsson.com>:

> Hi,
>=20
> the biggest open issue in the data model is policies. We need to decide=
:
>=20
> 1) whether policies (e.g., who can perform certain tasks like adding or=
=20
> removing a user) are in or out of the data model's scope.
>=20
> 2) if they are in scope, whether we follow a syntactic (e.g., user A ca=
n=20
> modify element <foo>) or semantic (e.g., user A can add new users to th=
e=20
> conference) approach.
>=20
> 3) the granularity to use. Whether to have pre-defined roles where=20
> higher roles are authorized to perform a super set of the operations=20
> performed by lower roles, or to have groups of users (similar to Unix=20
> groups).
>=20
> I would like to encourage people to discuss these issues because,=20
> otherwise, it will be impossible to make any progress on this field.
>=20
> Cheers,
>=20
> Gonzalo
>=20
>=20
> _______________________________________________
> XCON mailing list
> XCON@ietf.org
> https://www1.ietf.org/mailman/listinfo/xcon
>=20


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From xcon-bounces@ietf.org Mon Mar 12 12:43:02 2007
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From: Srivatsa Srinivasan <srivats@exchange.microsoft.com>
To: 'Cullen Jennings' <fluffy@cisco.com>, "'xcon@ietf.org'" <xcon@ietf.org>
Date: Mon, 12 Mar 2007 09:42:57 -0700
Subject: RE: [XCON] draft-srinivasan-xcon-eventpkg-extensions
Thread-Topic: [XCON] draft-srinivasan-xcon-eventpkg-extensions
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Sure, the motivation for this draft is described in the Limitations section=
 and we can re-word it to make it easier to read in the next revision. Was =
there anything in specific that you thought could be described better?

The primary motivation for defining a new MIME sub-type here is to overcome=
 the two limitations that prevent the XCON data model to be fully backward =
compatible with the schema in the SIP conference event package RFC 4575.

An example may help. The <controls> element under <available-media> defined=
 in the XCON data model may have many controls. Each time a control changes=
, a notification would be generated for users interested in those changes (=
who have an active subscription to the conference event package). Since <av=
ailable-media> does not have a state attribute defined, without the change =
proposed in this draft, the whole XML element would be sent with every sing=
le change that happens to every control under <available-media>. In additio=
n, certain schema elements in the SIP conference event package have been re=
-defined.

Thanks,
Srivatsa.

> -----Original Message-----
> From: Cullen Jennings [mailto:fluffy@cisco.com]
> Sent: Saturday, March 10, 2007 12:50 PM
> To: xcon@ietf.org
> Subject: [XCON] draft-srinivasan-xcon-eventpkg-extensions
>
>
> It's hard to read this draft and have enough context to fully
> understand what is going on here - a bit more background would
> probably help people understand it better.
>
> Cullen
>
> _______________________________________________
> XCON mailing list
> XCON@ietf.org
> https://www1.ietf.org/mailman/listinfo/xcon

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From xcon-bounces@ietf.org Mon Mar 12 12:50:24 2007
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From: Srivatsa Srinivasan <srivats@exchange.microsoft.com>
To: 'Henning Schulzrinne' <hgs@cs.columbia.edu>, 'Gonzalo Camarillo'
	<Gonzalo.Camarillo@ericsson.com>
Date: Mon, 12 Mar 2007 09:50:20 -0700
Subject: RE: [XCON] Policies in the data model
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I share the same opinion here (which is what made me comment to the origina=
l proposal in the first place). I would recommend postponing the decision t=
o sometime after we finalize the data model, the user id drafts, the confer=
ence event package and media usages (for the base controls -- mute/pause/la=
yout).

> -----Original Message-----
> From: Henning Schulzrinne [mailto:hgs@cs.columbia.edu]
> Sent: Monday, March 12, 2007 6:04 AM
> To: Gonzalo Camarillo
> Cc: XCON
> Subject: Re: [XCON] Policies in the data model
>
> I'll add that it might be interesting to look at the policy work in
> SIMPLE (common policy, etc.). It takes somewhat of a middle ground,
> with both more semantically oriented permissions and some operations
> that are closer to XML elements, although it probably tries to stay
> on the semantic side rather than, say, specifying Xpaths as
> permissions.
>
> In my personal opinion, it is very hard to make syntactic permissions
> work well, simply because one often wants to express permissions that
> span multiple elements and that only make sense if expressed as a
> whole. Also, syntactic permissions can easily yield meaningless or
> illegal operations ("remove the parent element that is required").
>
> On Mar 12, 2007, at 8:58 AM, Gonzalo Camarillo wrote:
>
> > Hi,
> >
> > the biggest open issue in the data model is policies. We need to
> > decide:
> >
> > 1) whether policies (e.g., who can perform certain tasks like
> > adding or removing a user) are in or out of the data model's scope.
> >
> > 2) if they are in scope, whether we follow a syntactic (e.g., user
> > A can modify element <foo>) or semantic (e.g., user A can add new
> > users to the conference) approach.
> >
> > 3) the granularity to use. Whether to have pre-defined roles where
> > higher roles are authorized to perform a super set of the
> > operations performed by lower roles, or to have groups of users
> > (similar to Unix groups).
> >
> > I would like to encourage people to discuss these issues because,
> > otherwise, it will be impossible to make any progress on this field.
> >
> > Cheers,
> >
> > Gonzalo
> >
> >
> > _______________________________________________
> > XCON mailing list
> > XCON@ietf.org
> > https://www1.ietf.org/mailman/listinfo/xcon
>
>
> _______________________________________________
> XCON mailing list
> XCON@ietf.org
> https://www1.ietf.org/mailman/listinfo/xcon

_______________________________________________
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From xcon-bounces@ietf.org Mon Mar 12 14:16:28 2007
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From: Gonzalo Camarillo <Gonzalo.Camarillo@ericsson.com>
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Hi Henning,

there is an already expired draft that tried and used the common policy 
language to define a conference's policy.

http://www.watersprings.org/pub/id/draft-niemi-xcon-cpcp-rules-00.txt

Maybe this could be a good starting point. XACML has also been mentioned 
in this thread. It would be interesting if somebody could have a look at 
how XACML could be used for our purposes to see whether or not is a good 
fit.

Regarding my question 1) below, there have been answers in favor and 
against including policy in the data model. We need to discuss this in 
more detail.

Cheers,

Gonzalo


Henning Schulzrinne wrote:
> I'll add that it might be interesting to look at the policy work in 
> SIMPLE (common policy, etc.). It takes somewhat of a middle ground, 
> with both more semantically oriented permissions and some operations 
> that are closer to XML elements, although it probably tries to stay 
> on the semantic side rather than, say, specifying Xpaths as permissions.
> 
> In my personal opinion, it is very hard to make syntactic permissions 
> work well, simply because one often wants to express permissions that 
> span multiple elements and that only make sense if expressed as a 
> whole. Also, syntactic permissions can easily yield meaningless or 
> illegal operations ("remove the parent element that is required").
> 
> On Mar 12, 2007, at 8:58 AM, Gonzalo Camarillo wrote:
> 
>  > Hi,
>  >
>  > the biggest open issue in the data model is policies. We need to 
>  > decide:
>  >
>  > 1) whether policies (e.g., who can perform certain tasks like 
>  > adding or removing a user) are in or out of the data model's scope.
>  >
>  > 2) if they are in scope, whether we follow a syntactic (e.g., user 
>  > A can modify element <foo>) or semantic (e.g., user A can add new 
>  > users to the conference) approach.
>  >
>  > 3) the granularity to use. Whether to have pre-defined roles where 
>  > higher roles are authorized to perform a super set of the 
>  > operations performed by lower roles, or to have groups of users 
>  > (similar to Unix groups).
>  >
>  > I would like to encourage people to discuss these issues because, 
>  > otherwise, it will be impossible to make any progress on this field.
>  >
>  > Cheers,
>  >
>  > Gonzalo
>  >
>  >
>  > _______________________________________________
>  > XCON mailing list
>  > XCON@ietf.org
>  > https://www1.ietf.org/mailman/listinfo/xcon
> 


_______________________________________________
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From xcon-bounces@ietf.org Mon Mar 12 14:47:35 2007
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From: Henning Schulzrinne <hgs@cs.columbia.edu>
Subject: Re: [XCON] Policies in the data model
Date: Mon, 12 Mar 2007 14:48:00 -0400
To: Gonzalo Camarillo <Gonzalo.Camarillo@ericsson.com>
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Just like SIMPLE data and policy are separate, I see some advantage  
of keeping them separate here as well. Plus, it seems likely that  
(some) policies change much less frequently than other conference  
details. As with any policy discussion, it might be helpful to gain a  
common understanding what all would be included, such as:

- creation of conferences ("can create conferences only from 9 to 5  
on Tuesdays")?

- permissions for changes of conference state ("can become moderator"  
vs. "can designate moderator")?

- resource controls ("can create conferences with no more than 8  
people")

This can get arbitrarily complex.

On Mar 12, 2007, at 2:15 PM, Gonzalo Camarillo wrote:

> Hi Henning,
>
> there is an already expired draft that tried and used the common  
> policy language to define a conference's policy.
>
> http://www.watersprings.org/pub/id/draft-niemi-xcon-cpcp-rules-00.txt
>
> Maybe this could be a good starting point. XACML has also been  
> mentioned in this thread. It would be interesting if somebody could  
> have a look at how XACML could be used for our purposes to see  
> whether or not is a good fit.
>
> Regarding my question 1) below, there have been answers in favor  
> and against including policy in the data model. We need to discuss  
> this in more detail.
>
> Cheers,
>
> Gonzalo


_______________________________________________
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Subject: RE: [XCON] Policies in the data model
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From: "Chris Boulton" <cboulton@ubiquity.net>
To: "Gonzalo Camarillo" <Gonzalo.Camarillo@ericsson.com>,
	"Henning Schulzrinne" <hgs@cs.columbia.edu>
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Gonzalo - I would just like to add to my previous comment.  If, for the
sake of progress, the group decides to bump policies from the Data Model
then I will not object.  The critical path at this moment in time is
progress and not another blockade.

Chris.


-----Original Message-----
From: Gonzalo Camarillo [mailto:Gonzalo.Camarillo@ericsson.com]=20
Sent: 12 March 2007 18:15
To: Henning Schulzrinne
Cc: XCON; Aki Niemi
Subject: Re: [XCON] Policies in the data model

Hi Henning,

there is an already expired draft that tried and used the common policy=20
language to define a conference's policy.

http://www.watersprings.org/pub/id/draft-niemi-xcon-cpcp-rules-00.txt

Maybe this could be a good starting point. XACML has also been mentioned

in this thread. It would be interesting if somebody could have a look at

how XACML could be used for our purposes to see whether or not is a good

fit.

Regarding my question 1) below, there have been answers in favor and=20
against including policy in the data model. We need to discuss this in=20
more detail.

Cheers,

Gonzalo


Henning Schulzrinne wrote:
> I'll add that it might be interesting to look at the policy work in=20
> SIMPLE (common policy, etc.). It takes somewhat of a middle ground,=20
> with both more semantically oriented permissions and some operations=20
> that are closer to XML elements, although it probably tries to stay=20
> on the semantic side rather than, say, specifying Xpaths as
permissions.
>=20
> In my personal opinion, it is very hard to make syntactic permissions=20
> work well, simply because one often wants to express permissions that=20
> span multiple elements and that only make sense if expressed as a=20
> whole. Also, syntactic permissions can easily yield meaningless or=20
> illegal operations ("remove the parent element that is required").
>=20
> On Mar 12, 2007, at 8:58 AM, Gonzalo Camarillo wrote:
>=20
>  > Hi,
>  >
>  > the biggest open issue in the data model is policies. We need to=20
>  > decide:
>  >
>  > 1) whether policies (e.g., who can perform certain tasks like=20
>  > adding or removing a user) are in or out of the data model's scope.
>  >
>  > 2) if they are in scope, whether we follow a syntactic (e.g., user=20
>  > A can modify element <foo>) or semantic (e.g., user A can add new=20
>  > users to the conference) approach.
>  >
>  > 3) the granularity to use. Whether to have pre-defined roles where=20
>  > higher roles are authorized to perform a super set of the=20
>  > operations performed by lower roles, or to have groups of users=20
>  > (similar to Unix groups).
>  >
>  > I would like to encourage people to discuss these issues because,=20
>  > otherwise, it will be impossible to make any progress on this
field.
>  >
>  > Cheers,
>  >
>  > Gonzalo
>  >
>  >
>  > _______________________________________________
>  > XCON mailing list
>  > XCON@ietf.org
>  > https://www1.ietf.org/mailman/listinfo/xcon
>=20


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From xcon-bounces@ietf.org Tue Mar 13 07:03:26 2007
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Subject: RE: [XCON] Policies in the data model
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From: "Oscar Novo \(JO/LMF\)" <oscar.novo@ericsson.com>
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	"Gonzalo Camarillo \(JO/LMF\)" <gonzalo.camarillo@ericsson.com>
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Hi Srivatsa,

The 04 version of the data model is already aligned with the user id
drafts. The conference user identifier is already defined in that
version.

Cheers,

Oscar

-----Original Message-----
From: Srivatsa Srinivasan [mailto:srivats@exchange.microsoft.com]=20
Sent: 12. maaliskuuta 2007 18:50
To: 'Henning Schulzrinne'; Gonzalo Camarillo (JO/LMF)
Cc: 'XCON'
Subject: RE: [XCON] Policies in the data model

I share the same opinion here (which is what made me comment to the
original proposal in the first place). I would recommend postponing the
decision to sometime after we finalize the data model, the user id
drafts, the conference event package and media usages (for the base
controls -- mute/pause/layout).

> -----Original Message-----
> From: Henning Schulzrinne [mailto:hgs@cs.columbia.edu]
> Sent: Monday, March 12, 2007 6:04 AM
> To: Gonzalo Camarillo
> Cc: XCON
> Subject: Re: [XCON] Policies in the data model
>
> I'll add that it might be interesting to look at the policy work in=20
> SIMPLE (common policy, etc.). It takes somewhat of a middle ground,=20
> with both more semantically oriented permissions and some operations=20
> that are closer to XML elements, although it probably tries to stay on

> the semantic side rather than, say, specifying Xpaths as permissions.
>
> In my personal opinion, it is very hard to make syntactic permissions=20
> work well, simply because one often wants to express permissions that=20
> span multiple elements and that only make sense if expressed as a=20
> whole. Also, syntactic permissions can easily yield meaningless or=20
> illegal operations ("remove the parent element that is required").
>
> On Mar 12, 2007, at 8:58 AM, Gonzalo Camarillo wrote:
>
> > Hi,
> >
> > the biggest open issue in the data model is policies. We need to
> > decide:
> >
> > 1) whether policies (e.g., who can perform certain tasks like adding

> > or removing a user) are in or out of the data model's scope.
> >
> > 2) if they are in scope, whether we follow a syntactic (e.g., user A

> > can modify element <foo>) or semantic (e.g., user A can add new=20
> > users to the conference) approach.
> >
> > 3) the granularity to use. Whether to have pre-defined roles where=20
> > higher roles are authorized to perform a super set of the operations

> > performed by lower roles, or to have groups of users (similar to=20
> > Unix groups).
> >
> > I would like to encourage people to discuss these issues because,=20
> > otherwise, it will be impossible to make any progress on this field.
> >
> > Cheers,
> >
> > Gonzalo
> >
> >
> > _______________________________________________
> > XCON mailing list
> > XCON@ietf.org
> > https://www1.ietf.org/mailman/listinfo/xcon
>
>
> _______________________________________________
> XCON mailing list
> XCON@ietf.org
> https://www1.ietf.org/mailman/listinfo/xcon

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Hi,

 > I would recommend postponing the
> decision to sometime after we finalize the data model, the user id 
> drafts, the conference event package and media usages (for the base 
> controls -- mute/pause/layout).

the user id stuff and the main media usages (i.e., audio and video) will 
be included in the data model. Therefore, we would be talking about 
finishing the data model and the event package, both of which should be 
easy to complete given that we may be removing the most controversial 
stuff from the data model (e.g., policies and most complicated media 
usages).

Cheers,

Gonzalo


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Hi All,

=20

As we actually have valuable face-to-face time in Prague, I think it
would be beneficial to plan some future activities for the group (either
in the meeting OR as a side meeting).  At last we seem to be making some
progress:

=20

-          the Framework is just about baked

-          the Data model is progressing well

-          folks are actively working on other XCON areas

=20

I think the coming period could be very important for the group and it
is essential that we are prepared in order to maximise productivity.  I
guess I am directing this mail to the Chairs and asking:

=20

-          What are the next steps for this working group and how can we
achieve this efficiently?

o        Get Framework submitted to the RFC editor.

o        Get Data model agreed and submitted to RFC editor

o        Plan next phases (with deadlines and responsibilities) for
activities that will build on the previous two points.

=20

The SIPPING WG is trying all sorts of new initiatives (Mary - feel free
to join in) to make the process more efficient and productive - it seems
we need similar action so we don't drift along.  I would be interested
to know the chairs thoughts + maybe we should have a side meeting to
discuss and work out a productive way forward (e.g. like a review
calendar and review team matrix).

=20

Best Regards,

=20

Chris.

=20

=20

=20




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<p class=3DMsoNormal><font size=3D2 face=3DArial><span lang=3DEN-GB style=
=3D'font-size:
10.0pt;font-family:Arial'>Hi All,</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span lang=3DEN-GB style=
=3D'font-size:
10.0pt;font-family:Arial'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span lang=3DEN-GB style=
=3D'font-size:
10.0pt;font-family:Arial'>As we actually have valuable face-to-face time in=
 </span></font><font
  size=3D2 face=3DArial><span lang=3DEN-GB style=3D'font-size:10.0pt;font-f=
amily:Arial'>Prague</span></font><font
size=3D2 face=3DArial><span lang=3DEN-GB style=3D'font-size:10.0pt;font-fam=
ily:Arial'>,
I think it would be beneficial to plan some future activities for the group
(either in the meeting OR as a side meeting).&nbsp; At last we seem to be
making some progress:</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span lang=3DEN-GB style=
=3D'font-size:
10.0pt;font-family:Arial'>&nbsp;</span></font></p>

<p class=3DMsoNormal style=3D'margin-left:36.0pt;text-indent:-18.0pt'><font=
 size=3D2
face=3DArial><span lang=3DEN-GB style=3D'font-size:10.0pt;font-family:Arial=
'>-<font
size=3D1 face=3D"Times New Roman"><span style=3D'font:7.0pt "Times New Roma=
n"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></font></span></font><font size=3D2 face=3DArial><span lang=3DEN-GB
style=3D'font-size:10.0pt;font-family:Arial'>the Framework is just about ba=
ked</span></font></p>

<p class=3DMsoNormal style=3D'margin-left:36.0pt;text-indent:-18.0pt'><font=
 size=3D2
face=3DArial><span lang=3DEN-GB style=3D'font-size:10.0pt;font-family:Arial=
'>-<font
size=3D1 face=3D"Times New Roman"><span style=3D'font:7.0pt "Times New Roma=
n"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></font></span></font><font size=3D2 face=3DArial><span lang=3DEN-GB
style=3D'font-size:10.0pt;font-family:Arial'>the Data model is progressing =
well</span></font></p>

<p class=3DMsoNormal style=3D'margin-left:36.0pt;text-indent:-18.0pt'><font=
 size=3D2
face=3DArial><span lang=3DEN-GB style=3D'font-size:10.0pt;font-family:Arial=
'>-<font
size=3D1 face=3D"Times New Roman"><span style=3D'font:7.0pt "Times New Roma=
n"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></font></span></font><font size=3D2 face=3DArial><span lang=3DEN-GB
style=3D'font-size:10.0pt;font-family:Arial'>folks are actively working on =
other
XCON areas</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span lang=3DEN-GB style=
=3D'font-size:
10.0pt;font-family:Arial'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span lang=3DEN-GB style=
=3D'font-size:
10.0pt;font-family:Arial'>I think the coming period could be very important=
 for
the group and it is essential that we are prepared in order to maximise
productivity. &nbsp;I guess I am directing this mail to the Chairs and aski=
ng:</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span lang=3DEN-GB style=
=3D'font-size:
10.0pt;font-family:Arial'>&nbsp;</span></font></p>

<p class=3DMsoNormal style=3D'margin-left:36.0pt;text-indent:-18.0pt'><font=
 size=3D2
face=3DArial><span lang=3DEN-GB style=3D'font-size:10.0pt;font-family:Arial=
'>-<font
size=3D1 face=3D"Times New Roman"><span style=3D'font:7.0pt "Times New Roma=
n"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></font></span></font><font size=3D2 face=3DArial><span lang=3DEN-GB
style=3D'font-size:10.0pt;font-family:Arial'>What are the next steps for th=
is
working group and how can we achieve this efficiently?</span></font></p>

<p class=3DMsoNormal style=3D'margin-left:72.0pt;text-indent:-18.0pt'><font=
 size=3D2
face=3D"Courier New"><span lang=3DEN-GB style=3D'font-size:10.0pt;font-fami=
ly:"Courier New"'>o<font
size=3D1 face=3D"Times New Roman"><span style=3D'font:7.0pt "Times New Roma=
n"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></font></span></font><font size=3D2 face=3DArial><span lang=3DEN-GB
style=3D'font-size:10.0pt;font-family:Arial'>Get Framework submitted to the=
 RFC
editor.</span></font></p>

<p class=3DMsoNormal style=3D'margin-left:72.0pt;text-indent:-18.0pt'><font=
 size=3D2
face=3D"Courier New"><span lang=3DEN-GB style=3D'font-size:10.0pt;font-fami=
ly:"Courier New"'>o<font
size=3D1 face=3D"Times New Roman"><span style=3D'font:7.0pt "Times New Roma=
n"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></font></span></font><font size=3D2 face=3DArial><span lang=3DEN-GB
style=3D'font-size:10.0pt;font-family:Arial'>Get Data model agreed and subm=
itted
to RFC editor</span></font></p>

<p class=3DMsoNormal style=3D'margin-left:72.0pt;text-indent:-18.0pt'><font=
 size=3D2
face=3D"Courier New"><span lang=3DEN-GB style=3D'font-size:10.0pt;font-fami=
ly:"Courier New"'>o<font
size=3D1 face=3D"Times New Roman"><span style=3D'font:7.0pt "Times New Roma=
n"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></font></span></font><font size=3D2 face=3DArial><span lang=3DEN-GB
style=3D'font-size:10.0pt;font-family:Arial'>Plan next phases (with deadlin=
es and
responsibilities) for activities that will build on the previous two points=
.</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span lang=3DEN-GB style=
=3D'font-size:
10.0pt;font-family:Arial'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span lang=3DEN-GB style=
=3D'font-size:
10.0pt;font-family:Arial'>The SIPPING WG is trying all sorts of new initiat=
ives
(Mary &#8211; feel free to join in) to make the process more efficient and
productive &#8211; it seems we need similar action so we don&#8217;t drift
along. &nbsp;I would be interested to know the chairs thoughts + maybe we
should have a side meeting to discuss and work out a productive way forward
(e.g. like a review calendar and review team matrix).</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span lang=3DEN-GB style=
=3D'font-size:
10.0pt;font-family:Arial'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span lang=3DEN-GB style=
=3D'font-size:
10.0pt;font-family:Arial'>Best Regards,</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span lang=3DEN-GB style=
=3D'font-size:
10.0pt;font-family:Arial'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span lang=3DEN-GB style=
=3D'font-size:
10.0pt;font-family:Arial'>Chris.</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span lang=3DEN-GB style=
=3D'font-size:
10.0pt;font-family:Arial'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span lang=3DEN-GB style=
=3D'font-size:
10.0pt;font-family:Arial'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span lang=3DEN-GB style=
=3D'font-size:
10.0pt;font-family:Arial'>&nbsp;</span></font></p>

</div>

<br><br>
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<P>Information contained in this e-mail and any attachments are intended fo=
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From xcon-bounces@ietf.org Tue Mar 13 07:49:09 2007
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From: Lorenzo Miniero <lorenzo.miniero@unina.it>
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Hi Chris,


> Hi All,
>=20
> =20
>=20
> As we actually have valuable face-to-face time in Prague, I think it=20
> would be beneficial to plan some future activities for the group (eithe=
r=20
> in the meeting OR as a side meeting).  At last we seem to be making som=
e=20
> progress:
>=20
> =20
>=20
> -          the Framework is just about baked
>=20
> -          the Data model is progressing well
>=20
> -          folks are actively working on other XCON areas
>=20
> =20
>=20
> I think the coming period could be very important for the group and it=20
> is essential that we are prepared in order to maximise productivity.  I=
=20
> guess I am directing this mail to the Chairs and asking:
>=20
> =20
>=20
> -          What are the next steps for this working group and how can w=
e=20
> achieve this efficiently?
>=20
> o        Get Framework submitted to the RFC editor.
>=20
> o        Get Data model agreed and submitted to RFC editor
>=20
> o        Plan next phases (with deadlines and responsibilities) for=20
> activities that will build on the previous two points.
>=20
> =20
>=20
> The SIPPING WG is trying all sorts of new initiatives (Mary =96 feel fr=
ee=20
> to join in) to make the process more efficient and productive =96 it se=
ems=20
> we need similar action so we don=92t drift along.  I would be intereste=
d=20
> to know the chairs thoughts + maybe we should have a side meeting to=20
> discuss and work out a productive way forward (e.g. like a review=20
> calendar and review team matrix).
>=20
> =20
>=20
> Best Regards,
>=20
> =20
>=20
> Chris.
>=20
> =20
>=20
> =20
>=20
> =20
>=20
>=20
>=20
> Information contained in this e-mail and any attachments are intended=20
> for the use of the addressee only, and may contain confidential=20
> information of Ubiquity Software Corporation. All unauthorized use,=20
> disclosure or distribution is strictly prohibited. If you are not the=20
> addressee, please notify the sender immediately and destroy all copies=20
> of this email. Ubiquity Software Corporation plc, a company registered=20
> under the laws of England and Wales, Registration 2719723, registered=20
> offices at Eastern Business Park, Building 3, Wern Fawr Lane, St.=20
> Mellons, Cardiff CF3 5EA, Wales, United Kingdom.
>=20
>=20
> -----------------------------------------------------------------------=
-
>=20
> _______________________________________________
> XCON mailing list
> XCON@ietf.org
> https://www1.ietf.org/mailman/listinfo/xcon


Just my two cents on the matter.

IMHO the absolute priority, after the current Framework- and Data=20
Model-related stuff, should be the Conference Control Protocol, which is=20
a sensitive lack and on which almost all efforts should be focused.
It's a pity that the new proposed CCMP draft didn't get a slot at the=20
upcoming meeting in Prague, but I hope some seeds of discussions on it=20
will be born there anyway.

Cheers,

Lorenzo

--=20
Lorenzo Miniero, Junior Researcher
Dipartimento di Informatica e Sistemistica
Universit=E0 degli Studi di Napoli "Federico II"
Via Claudio 21 -- 80125 Napoli (Italy)
Phone: +390817683821 - Fax: +390817683816
Email: lorenzo.miniero@unina.it

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From xcon-bounces@ietf.org Tue Mar 13 08:07:33 2007
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From: Henning Schulzrinne <hgs@cs.columbia.edu>
Subject: Re: [XCON] Policies in the data model
Date: Tue, 13 Mar 2007 08:07:13 -0400
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I would argue that policies are generally a rat-hole and we may want  
to punt on these for now. In SIMPLE, it has taken years to finish the  
policy documents, and the problem there is much more constrained.  
(And, as one of the co-authors, I'm pretty sure the solution is over- 
engineered.)

Or, alternatively, have an extremely minimal, but extensible, policy  
set that addresses only two questions:

- who can modify the conference description
- who can create a conference from a template

Once you get to the "can create conferences with no more than 5  
members, but only on alternate Tuesdays that aren't holidays", we'll  
be celebrating the tenth anniversary of the WG.

If we can't quickly agree on a minimalist set of policies, it's a  
good sign that this isn't ready for protocol work.

Henning

On Mar 13, 2007, at 5:03 AM, Chris Boulton wrote:

> Gonzalo - I would just like to add to my previous comment.  If, for  
> the
> sake of progress, the group decides to bump policies from the Data  
> Model
> then I will not object.  The critical path at this moment in time is
> progress and not another blockade.
>
> Chris.
>


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From xcon-bounces@ietf.org Tue Mar 13 08:23:28 2007
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Subject: RE: [XCON] Policies in the data model
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I generally find that those with the voice of previous experience (both
from an engineering + protocol creation perspective) have the best take
on such topics.  With XCON's history in mind, I 100% agree with
Henning's last statement:

'If we can't quickly agree on a minimalist set of policies, it's a=20=20
good sign that this isn't ready for protocol work'.


Chris.


-----Original Message-----
From: Henning Schulzrinne [mailto:hgs@cs.columbia.edu]=20
Sent: 13 March 2007 12:07
To: Chris Boulton
Cc: Gonzalo Camarillo; XCON; Aki Niemi
Subject: Re: [XCON] Policies in the data model

I would argue that policies are generally a rat-hole and we may want=20=20
to punt on these for now. In SIMPLE, it has taken years to finish the=20=20
policy documents, and the problem there is much more constrained.=20=20
(And, as one of the co-authors, I'm pretty sure the solution is over-=20
engineered.)

Or, alternatively, have an extremely minimal, but extensible, policy=20=20
set that addresses only two questions:

- who can modify the conference description
- who can create a conference from a template

Once you get to the "can create conferences with no more than 5=20=20
members, but only on alternate Tuesdays that aren't holidays", we'll=20=20
be celebrating the tenth anniversary of the WG.

If we can't quickly agree on a minimalist set of policies, it's a=20=20
good sign that this isn't ready for protocol work.

Henning

On Mar 13, 2007, at 5:03 AM, Chris Boulton wrote:

> Gonzalo - I would just like to add to my previous comment.  If, for=20=20
> the
> sake of progress, the group decides to bump policies from the Data=20=20
> Model
> then I will not object.  The critical path at this moment in time is
> progress and not another blockade.
>
> Chris.
>




Information contained in this e-mail and any attachments are intended for t=
he use of the addressee only, and may contain confidential information of U=
biquity Software Corporation. All unauthorized use, disclosure or distribut=
ion is strictly prohibited.  If you are not the addressee, please notify th=
e sender immediately and destroy all copies of this email. Ubiquity Softwar=
e Corporation plc, a company registered under the laws of England and Wales=
, Registration 2719723, registered offices at Eastern Business Park, Buildi=
ng 3, Wern Fawr Lane, St. Mellons, Cardiff CF3 5EA, Wales, United Kingdom.


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Subject: RE: [XCON] Policies in the data model
Date: Tue, 13 Mar 2007 14:24:22 +0100
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From: "Oscar Novo \(JO/LMF\)" <oscar.novo@ericsson.com>
To: "Henning Schulzrinne" <hgs@cs.columbia.edu>,
	"Chris Boulton" <cboulton@ubiquity.net>
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Actually the idea of the authors of the data model draft from the very
beginning was to have a minimalist set of policies good enough to define
the basic actions in a conference (see section 3.7.2. of the 03 version
).=20

>From the 00 version of the draft we defined a semantic approach
following the guidelines of the "Conference Policy Authorization Rules"
draft
(http://www.watersprings.org/pub/id/draft-niemi-xcon-cpcp-rules-00.txt)
and the "common policy" draft (draft-ietf-geopriv-common-policy).

This information has been removed from the last version of the data
model because some people complained about the idea.=20

We can introduce that information again in the draft making the
modifications needed to adapt it to the requirements of the WG.

Oscar=20

-----Original Message-----
From: Henning Schulzrinne [mailto:hgs@cs.columbia.edu]=20
Sent: 13. maaliskuuta 2007 14:07
To: Chris Boulton
Cc: Aki Niemi; Gonzalo Camarillo (JO/LMF); XCON
Subject: Re: [XCON] Policies in the data model

I would argue that policies are generally a rat-hole and we may want to
punt on these for now. In SIMPLE, it has taken years to finish the
policy documents, and the problem there is much more constrained. =20
(And, as one of the co-authors, I'm pretty sure the solution is over-
engineered.)

Or, alternatively, have an extremely minimal, but extensible, policy set
that addresses only two questions:

- who can modify the conference description
- who can create a conference from a template

Once you get to the "can create conferences with no more than 5 members,
but only on alternate Tuesdays that aren't holidays", we'll be
celebrating the tenth anniversary of the WG.

If we can't quickly agree on a minimalist set of policies, it's a good
sign that this isn't ready for protocol work.

Henning

On Mar 13, 2007, at 5:03 AM, Chris Boulton wrote:

> Gonzalo - I would just like to add to my previous comment.  If, for=20
> the sake of progress, the group decides to bump policies from the Data

> Model then I will not object.  The critical path at this moment in=20
> time is progress and not another blockade.
>
> Chris.
>


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From xcon-bounces@ietf.org Tue Mar 13 10:59:18 2007
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From: Srivatsa Srinivasan <srivats@exchange.microsoft.com>
To: Gonzalo Camarillo <Gonzalo.Camarillo@ericsson.com>
Date: Tue, 13 Mar 2007 07:59:01 -0700
Subject: RE: [XCON] Policies in the data model
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Gonzalo,

Okay. I was referring to the media usages in relation to
SDP covered in draft-srinivasan-xcon-usecases-mediausage-01.

Not sure what you mean by the most complicated media usages
-- we decided to leave only the base controls in there, if I
remember right?

Thanks,
Srivatsa.

________________________________________
From: Gonzalo Camarillo [Gonzalo.Camarillo@ericsson.com]
Sent: Tuesday, March 13, 2007 4:16 AM
To: Srivatsa Srinivasan
Cc: Henning Schulzrinne; XCON
Subject: Re: [XCON] Policies in the data model

Hi,

 > I would recommend postponing the
> decision to sometime after we finalize the data model, the user id
> drafts, the conference event package and media usages (for the base
> controls -- mute/pause/layout).

the user id stuff and the main media usages (i.e., audio and video) will
be included in the data model. Therefore, we would be talking about
finishing the data model and the event package, both of which should be
easy to complete given that we may be removing the most controversial
stuff from the data model (e.g., policies and most complicated media
usages).

Cheers,

Gonzalo


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From xcon-bounces@ietf.org Tue Mar 13 16:05:57 2007
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Hi,

I agree with Henning. Let's finish the basic stuff first and worry about 
the complicated stuff later so that we can make some progress.

Cheers,

Gonzalo

Henning Schulzrinne wrote:
> I would argue that policies are generally a rat-hole and we may want to 
> punt on these for now. In SIMPLE, it has taken years to finish the 
> policy documents, and the problem there is much more constrained. (And, 
> as one of the co-authors, I'm pretty sure the solution is over-engineered.)
> 
> Or, alternatively, have an extremely minimal, but extensible, policy set 
> that addresses only two questions:
> 
> - who can modify the conference description
> - who can create a conference from a template
> 
> Once you get to the "can create conferences with no more than 5 members, 
> but only on alternate Tuesdays that aren't holidays", we'll be 
> celebrating the tenth anniversary of the WG.
> 
> If we can't quickly agree on a minimalist set of policies, it's a good 
> sign that this isn't ready for protocol work.
> 
> Henning
> 
> On Mar 13, 2007, at 5:03 AM, Chris Boulton wrote:
> 
>> Gonzalo - I would just like to add to my previous comment.  If, for the
>> sake of progress, the group decides to bump policies from the Data Model
>> then I will not object.  The critical path at this moment in time is
>> progress and not another blockade.
>>
>> Chris.
>>
> 


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From xcon-bounces@ietf.org Tue Mar 13 16:52:58 2007
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Subject: [XCON] Abandoning XCAP-based CPCP: reasons
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Folks,

at some point, XCON was working on an XCAP-based mechanism (CPCP)
to perform conference control. It seems that OMA was interested in this 
solution, at least at that point (2005):

https://datatracker.ietf.org/documents/LIAISON/file260.pdf

Could somebody summarize the reasons why CPCP was abandoned? I believe 
it would be useful to understand those reasons in order to start working 
on the XCON conference control protocol and avoid whatever was wrong 
with the XCAP-based proposal.

Thanks,

Gonzalo

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Dear all,

I've been thinking about the policy issue again and I would like to bette=
r
explain why I was suggesting the adoption of a framework like XACML, whic=
h
clearly envisages a neat separation between the data model and the polici=
es.

DISCLAIMER: this is going to be a long mail...just delete it if you're no=
t
interested in the subject...

First of all, I remind you that the core RBAC (Role Based Access Control)=
 model
is based on the following elements:

-------------------------------------------------------------------------=
---
RBAC element        | XCON related concept | XACML-based implementation
-------------------------------------------------------------------------=
---
1.        Users     | XCON users           | implemented through XACML su=
bjects
2.        Roles     | XCON roles           | implemented through XACML su=
bject
attributes
3.        Objects   | XCON data model      | implemented through XACML
resources
4.       Operations | XCON operations      | implemented through XACML ac=
tions
5.       Permissions| XCON mgmt framework  | implemented through  XACML R=
ole
<PolicySet> and Permission <PolicySet> instances (see below...)
-------------------------------------------------------------------------=
------

Based on the OASIS document "Core and hierarchical role based access cont=
rol
(RBAC) profile of XACML v2.0", available at
http://docs.oasis-open.org/xacml/2.0/access_control-xacml-2.0-rbac-profil=
e1-spec-os.pdf,
I have elaborated a simple example which I hope helps clarify my idea.

Let us suppose we have two distinct roles:

1- conference creator --> can create a new conference
2- conference user --> can just join an existing conference

Clearly, a conference creator can also play the role of a conference user=
...i
RBAC this means that a conference creator role is "junior" to a conferenc=
e user
role.

We can first of all use XACML to define such roles.

The following XACML permission policy set defines permissions associated =
with
the conference creator role...

=20
<PolicySet xmlns=3D"urn:oasis:names:tc:xacml:2.0:policy:schema:os"       =
  =20
    PolicySetId=3D"PPS:creator:role"         =20
 =20
PolicyCombiningAlgId=3D"urn:oasis:names:tc:xacml:1.0:policy-combining-alg=
orithm:permit-overrides">
      =20
 =20
         =20
  <!-- Permissions for the creator role -->         =20
  <Policy PolicyId=3D"Permissions:specifically:for:the:creator:role"     =
    =20
   =20
RuleCombiningAlgId:"urn:oasis:names:tc:xacml:1.0:rule-combining-algorithm=
:
permit-overrides">         =20
         =20
    <!-- Permission to create a new XCON conference -->         =20
    <Rule RuleId=3D"Permission:to:create:an:XCON:conference"         =20
        Effect=3D"Permit">         =20
      <Target>         =20
        <Resources>         =20
          <Resource>         =20
            <ResourceMatch
MatchId=3D"urn:oasis:names:tc:xacml:1.0:function:string-equal">         =20
              <attributeValue         =20
DataType=3D"http://www.w3.org/2001/XMLSchema#string">XCON
conference</AttributeValue>         =20
              <ResourceAttributeDesignator         =20
               =20
AttributeId=3D"urn:oasis:names:tc:xacml:1.0:resource:resource-id"        =
 =20
                  DataType=3D"http://www.w3.org/2001/XMLSchema#string"/> =
       =20

            </ResourceMatch>         =20
          </Resource>         =20
        </Resources>         =20
        <actions>         =20
          <action>         =20
            <actionMatch
MatchId=3D"urn:oasis:names:tc:xacml:1.0:function:string-equal">         =20
              <attributeValue         =20
               =20
DataType=3D"http://www.w3.org/2001/XMLSchema#string">create</AttributeVal=
ue>     =20
  =20
              <actionAttributeDesignator         =20
                  AttributeId=3D"urn:oasis:names:tc:xacml:1.0:action:acti=
on-id"  =20
     =20

                  DataType=3D"http://www.w3.org/2001/XMLSchema#string"/> =
       =20

            </ActionMatch>         =20
          </Action>         =20
        </Actions>         =20
      </Target>         =20
    </Rule>         =20
  </Policy>         =20
         =20
  <!-- Include permissions associated with conference user role -->      =
   =20
  <PolicySetIdReference>PPS:user:role</PolicySetIdReference>         =20
</PolicySet>
       =20

The following permission policy set, in turn, defines the permissions
associated
with the conference user role (i.e. joining an existing conference...)

=20
<PolicySet xmlns=3D"urn:oasis:names:tc:xacml:2.0:policy:schema:os"       =
  =20
     PolicySetId=3D"PPS:user:role"         =20
   =20
PolicyCombiningAlgId=3D"urn:oasis:names:tc:xacml:1.0:policy-combining-alg=
orithm:permit-overrides">
      =20
 =20
         =20
  <!-- Permissions for the user role -->         =20
  <Policy PolicyId=3D"Permissions:specifically:for:the:user:role"        =
 =20
   =20
RuleCombiningAlgId=3D""urn:oasis:names:tc:xacml:1.0:rule-combining-algori=
thm:permit-overrides">
      =20
 =20
         =20
    <!-- Permission to join an existing conference -->         =20
    <Rule RuleId=3D"Permission:to:join:an:XCON:conference"         =20
        Effect=3D"Permit">         =20
      <Target>         =20
        <Resources>         =20
          <Resource>         =20
            <ResourceMatch
MatchId=3D"urn:oasis:names:tc:xacml:1.0:function:string-equal">         =20
              <attributeValue         =20
DataType=3D"http://www.w3.org/2001/XMLSchema#string">XCON
conference</AttributeValue>         =20
              <ResourceAttributeDesignator         =20
               =20
AttributeId=3D"urn:oasis:names:tc:xacml:1.0:resource:resource-id"        =
 =20
                  DataType=3D"http://www.w3.org/2001/XMLSchema#string"/> =
       =20

            </ResourceMatch>         =20
          </Resource>         =20
        </Resources>         =20
        <actions>         =20
          <action>         =20
            <actionMatch
MatchId=3D"urn:oasis:names:tc:xacml:1.0:function:string-equal">         =20
              <attributeValue         =20
                  DataType=3D"http://www.w3.org/2001/XMLSchema#string">jo=
in
</AttributeValue>         =20
              <actionAttributeDesignator         =20
                  AttributeId=3D"urn:oasis:names:tc:xacml:1.0:action:acti=
on-id"  =20
     =20

                  DataType=3D"http://www.w3.org/2001/XMLSchema#string"/> =
       =20

            </ActionMatch>         =20
          </Action>         =20
        </Actions>         =20
      </Target>         =20
    </Rule>         =20
  </Policy>         =20
</PolicySet>       =20

Once done with the permission policy sets, we can move to role policy set=
s,
which are used in order to associate policy permission sets with specific
roles.
This is done by using a <PolicySetIdReference> tag which points to the
permission policy set associated with a specific role.
For the creator role...

=20
<PolicySet xmlns=3D"urn:oasis:names:tc:xacml:2.0:policy:schema:os"       =
  =20
    PolicySetId=3D"RPS:creator:role"         =20
 =20
PolicyCombiningAlgId=3D"urn:oasis:names:tc:xacml:1.0:policy-combining-alg=
orithm:
permit-overrides">         =20
  <Target>         =20
    <Subjects>         =20
      <Subject>         =20
        <SubjectMatch
MatchId=3D"urn:oasis:names:tc:xacml:1.0:function:anyURI-equal">         =20
          <attributeValue         =20
           =20
DataType=3D"http://www.w3.org/2001/XMLSchema#anyURI">urn:example:role-val=
ues:creator</AttributeValue>
      =20
 =20
          <SubjectAttributeDesignator         =20
              AttributeId=3D"urn:oasis:names:tc:xacml:2.0:subject:role"  =
       =20
              DataType=3D"http://www.w3.org/2001/XMLSchema#anyURI"/>     =
    =20
        </SubjectMatch>         =20
      </Subject>         =20
    </Subjects>         =20
  </Target>         =20
         =20
  <!-- Use permissions associated with the creator role -->         =20
  <PolicySetIdReference>PPS:creator:role</PolicySetIdReference>         =20
</PolicySet>       =20
 =20
Similarly, for the user role:

=20
<PolicySet xmlns=3D"urn:oasis:names:tc:xacml:2.0:policy:schema:os"       =
  =20
    PolicySetId=3D"RPS:user:role"         =20
 =20
PolicyCombiningAlgId=3D"urn:oasis:names:tc:xacml:1.0:policy-combining-alg=
orithm:
permit-overrides">         =20
  <Target>         =20
    <Subjects>         =20
      <Subject>         =20
        <SubjectMatch
MatchId=3D"urn:oasis:names:tc:xacml:1.0:function:anyURI-equal">         =20
          <attributeValue         =20
           =20
DataType=3D"http://www.w3.org/2001/XMLSchema#anyURI">urn:example:role-val=
ues:user</AttributeValue>
      =20
 =20
          <SubjectAttributeDesignator         =20
              AttributeId=3D"urn:oasis:names:tc:xacml:2.0:subject:role"  =
       =20
              DataType=3D"http://www.w3.org/2001/XMLSchema#anyURI"/>     =
    =20
        </SubjectMatch>         =20
      </Subject>         =20
    </Subjects>         =20
  </Target>         =20
         =20
  <!-- Use permissions associated with the user role -->         =20
  <PolicySetIdReference>PPS:user:role</PolicySetIdReference>         =20
</PolicySet>       =20

That's all. With these policies in place, acess to the (XCON data model..=
.)
conference object should be appropriately controlled.
Coming to the issue of assigning users to roles, which is BTW outside the=
 scope
of an XACML Policy Decision Point (PDP), can be done through
so-called role-assignment policies. Such assignment should be under the
responsibility of an ad-hoc dedicated Role Assignment entity.

In the following example, we have a role assignment policy with two rules=
: the
first rule states that Simon is allowed to play the "creator" role; the s=
econd

states that Tobia and Lorenzo are just allowed to play the "user" role, b=
ut
only
between 9 am and 4 pm.


=20
<Policy xmlns=3D"urn:oasis:names:tc:xacml:2.0:policy:schema:os"         =20
    PolicyId=3D"Role:Assignment:Policy"         =20
 =20
RuleCombiningAlgId=3D"urn:oasis:names:tc:xacml:1.0:rule-combining-algorit=
hm:permit-overrides">
         =20
<!-- Creator role requirements rule -->         =20
<Rule RuleId=3D"creator:role:requirements" Effect=3D"Permit">         =20
  <Target>         =20
    <Subjects>         =20
      <Subject>         =20
        <SubjectMatch
MatchId=3D"urn:oasis:names:tc:xacml:1.0:function:string-equal">         =20
          <attributeValue         =20
             =20
DataType=3D"http://www.w3.org/2001/XMLSchema#string">Simon</AttributeValu=
e>      =20
 =20
          <SubjectAttributeDesignator         =20
               AttributeId=3D"urn:oasis:names:tc:xacml:1.0:subject:subjec=
t-id"   =20
    =20

               DataType=3D"http://www.w3.org/2001/XMLSchema#string"/>    =
     =20
        </SubjectMatch>         =20
      </Subject>         =20
    </Subjects>         =20
    <Resources>         =20
      <Resource>         =20
        <ResourceMatch
MatchId=3D"urn:oasis:names:tc:xacml:1.0:function:anyURI-equal">         =20
          <attributeValue         =20
           =20
DataType=3D"http://www.w3.org/2001/XMLSchema#anyURI">urn:example:role-val=
ues:creator</AttributeValue>
      =20
 =20
          <ResourceAttributeDesignator         =20
              AttributeId=3D"urn:oasis:names:tc:xacml:2.0:subject:role"  =
       =20
              DataType=3D"http://www.w3.org/2001/XMLSchema#anyURI"/>     =
    =20
        </ResourceMatch>         =20
      </Resource>         =20
    </Resources>         =20
    <actions>         =20
      <action>         =20
        <actionMatch
MatchId=3D"urn:oasis:names:tc:xacml:1.0:function:anyURI-equal">         =20
          <attributeValue         =20
           =20
DataType=3D"http://www.w3.org/2001/XMLSchema#anyURI">urn:oasis:names:tc:x=
acml:2.0:actions:enableRole</AttributeValue>
      =20
 =20
          <actionAttributeDesignator         =20
              AttributeId=3D"urn:oasis:names:tc:xacml:1.0:action:
action-id"         =20
              DataType=3D"http://www.w3.org/2001/XMLSchema#anyURI"/>     =
    =20
        </ActionMatch>         =20
      </Action>         =20
    </Actions>         =20
  </Target>         =20
</Rule>

=20
<!--  User role requirements rule -->         =20
<Rule RuleId=3D"user:role:requirements" Effect=3D"Permit">         =20
  <Target>         =20
    <Subjects>         =20
      <Subject>         =20
        <SubjectMatch
MatchId=3D"urn:oasis:names:tc:xacml:1.0:function:string-equal">         =20
          <attributeValue         =20
           =20
DataType=3D"http://www.w3.org/2001/XMLSchema#string">Tobia</AttributeValu=
e>      =20
 =20
          <SubjectAttributeDesignator         =20
              AttributeId=3D"urn:oasis:names:tc:xacml:1.0:subject:subject=
-id"    =20
   =20
              DataType=3D"http://www.w3.org/2001/XMLSchema#string"/>     =
    =20
        </SubjectMatch>         =20
      </Subject>         =20
      <Subject>         =20
        <SubjectMatch
MatchId=3D"urn:oasis:names:tc:xacml:1.0:function:string-equal">         =20
          <attributeValue         =20
           =20
DataType=3D"http://www.w3.org/2001/XMLSchema#string">Lorenzo</AttributeVa=
lue>    =20
   =20

          <SubjectAttributeDesignator         =20
              AttributeId=3D"urn:oasis:names:tc:xacml:1.0:subject:subject=
-id"    =20
   =20
              DataType=3D"http://www.w3.org/2001/XMLSchema#string"/>     =
    =20
        </SubjectMatch>         =20
      </Subject>         =20
    </Subjects>         =20
    <Resources>         =20
      <Resource>         =20
        <ResourceMatch
MatchId=3D"urn:oasis:names:tc:xacml:1.0:function:anyURI-equal">         =20
          <attributeValue         =20
           =20
DataType=3D"http://www.w3.org/2001/XMLSchema#anyURI">urn:example:role-val=
ues:user</AttributeValue>
      =20
 =20
          <ResourceAttributeDesignator         =20
              AttributeId=3D"urn:oasis:names:tc:xacml:2.0:subject:role"  =
       =20
              DataType=3D"http://www.w3.org/2001/XMLSchema#anyURI"/>     =
    =20
        </ResourceMatch>         =20
      </Resource>         =20
    </Resources>         =20
    <actions>         =20
      <action>         =20
        <actionMatch
MatchId=3D"urn:oasis:names:tc:xacml:1.0:function:anyURI-equal">         =20
          <attributeValue         =20
           =20
DataType=3D"http://www.w3.org/2001/XMLSchema#anyURI">urn:oasis:names:tc:x=
acml:2.0:actions:enableRole</AttributeValue>
      =20
 =20
          <actionAttributeDesignator         =20
              AttributeId=3D"urn:oasis:names:tc:xacml:1.0:action:action-i=
d"      =20
 =20
              DataType=3D"http://www.w3.org/2001/XMLSchema#anyURI"/>     =
    =20
        </ActionMatch>         =20
      </Action>         =20
    </Actions>         =20
  </Target>         =20
  <Condition>         =20
   <apply FunctionId=3D"urn:oasis:names:tc:xacml:1.0:function:and">      =
   =20
    <apply
FunctionId=3D"urn:oasis:names:tc:xacml:1.0:function:time-greater-than-or-=
equal"> =20
    =20
 =20
      <apply
FunctionId=3D"urn:oasis:names:tc:xacml:1.0:function:time-one-and-only">  =
       =20
        <EnvironmentAttributeDesignator         =20
            AttributeId=3D"urn:oasis:names:tc:xacml:1.0:environment:curre=
nt-time"=20
     =20
 =20
            DataType=3D"http://www.w3.org/2001/XMLSchema#time"/>         =
=20
      </Apply>         =20
      <attributeValue         =20
         DataType=3D"http://www.w3.org/2001/XMLSchema#time">9h</Attribute=
Value>  =20
     =20

    </Apply>         =20
    <apply
FunctionId=3D"urn:oasis:names:tc:xacml:1.0:function:time-less-than-or-equ=
al">    =20
   =20

      <apply
FunctionId=3D"urn:oasis:names:tc:xacml:1.0:function:time-one-and-only">  =
       =20
        <EnvironmentAttributeDesignator         =20
            AttributeId=3D"urn:oasis:names:tc:xacml:1.0:environment:curre=
nt-time"=20
     =20
 =20
            DataType=3D"http://www.w3.org/2001/XMLSchema#time"/>         =
=20
      </Apply>         =20
      <attributeValue         =20
          DataType=3D"http://www.w3.org/2001/XMLSchema#time">16h</Attribu=
teValue>=20
     =20
 =20
   </Apply>         =20
   </Apply>         =20
  </Condition>         =20
</Rule>       =20
         =20
</Policy>       =20

I hope this helps clarify my point of view.

Cheers,

Simon
--=20
                            _\\|//_
                            ( O-O )
   ~~~~~~~~~~~~~~~~~~~~~~o00~~(_)~~00o~~~~~~~~~~~~~~~~~~~~~~~~
                    Simon Pietro Romano
              Universita' di Napoli Federico II
                 Computer Science Department=20
        Phone: +39 081 7683823 -- Fax: +39 081 7684219
                e-mail: spromano@unina.it

    <<Molti mi dicono che lo scoraggiamento =E8 l'alibi degli=20
   idioti. Ci rifletto un istante; e mi scoraggio>>. Magritte.
                         oooO
   ~~~~~~~~~~~~~~~~~~~~~~(   )~~ Oooo~~~~~~~~~~~~~~~~~~~~~~~~~
                          \ (    (   )
                           \_)    ) /
                                 (_/




Scrive Henning Schulzrinne <hgs@cs.columbia.edu>:

> I would argue that policies are generally a rat-hole and we may want =20
> to punt on these for now. In SIMPLE, it has taken years to finish the =20
> policy documents, and the problem there is much more constrained. =20
> (And, as one of the co-authors, I'm pretty sure the solution is over-=20
> engineered.)
>=20
> Or, alternatively, have an extremely minimal, but extensible, policy =20
> set that addresses only two questions:
>=20
> - who can modify the conference description
> - who can create a conference from a template
>=20
> Once you get to the "can create conferences with no more than 5 =20
> members, but only on alternate Tuesdays that aren't holidays", we'll =20
> be celebrating the tenth anniversary of the WG.
>=20
> If we can't quickly agree on a minimalist set of policies, it's a =20
> good sign that this isn't ready for protocol work.
>=20
> Henning
>=20
> On Mar 13, 2007, at 5:03 AM, Chris Boulton wrote:
>=20
> > Gonzalo - I would just like to add to my previous comment.  If, for =20
> > the
> > sake of progress, the group decides to bump policies from the Data =20
> > Model
> > then I will not object.  The critical path at this moment in time is
> > progress and not another blockade.
> >
> > Chris.
> >
>=20
>=20
> _______________________________________________
> XCON mailing list
> XCON@ietf.org
> https://www1.ietf.org/mailman/listinfo/xcon
>=20


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From xcon-bounces@ietf.org Sun Mar 18 05:18:29 2007
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Date: Sun, 18 Mar 2007 10:23:37 +0100
From: Lorenzo Miniero <lorenzo.miniero@unina.it>
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Subject: [XCON] Potential problem in the BFCP specification
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Dear all,

by making some performance and robustness tests on our CONFIANCE platform=
, we
met what could be a potential problem in the BFCP specification.

A single FLOOR-REQUEST-INFORMATION can be quite big in size, considering =
it
contains a lot of optional text information (i.e. the STATUS-INFO in the
OVERALL-REQUEST-STATUS and in the FLOOR-REQUEST-STATUS subattributes, the
PARTICIPANT-PROVIDED-INFO and the text in REQUESTED-BY-INFORMATION and
BENEFICIARY-INFORMATION).
If many requests for the same floor are made, a FloorStatus message conse=
quent
to a FloorQuery regarding that floor would contain A LOT of
FLOOR-REQUEST-INFORMATION, regarding all the requests that have been made=
 for
the same floor and their current status. This means that the overall size=
 of
the FloorStatus message can easily exceed the payload size limit in the c=
ommon
header, that is only 16 bit.

Is this to be considered a potential problem in how the BFCP has ben spec=
ified
so far? Many requests for a same floor could be considered rare, if we ta=
ke the
example of a floor assigned to a writable resource, as right to send audi=
o
and/or video frames. But a floor could be assigned to a read-only resourc=
e we
want to moderate access to as well, and in this case many requests for th=
e same
floor could be a quite more common situation.

In any case, in my opinion something should be thought to fix this, or at=
 least
prevent it from happening. Extending the bits dedicated to the payload si=
ze
limit would be probably too invasive and not compliant with the current B=
FCP
RFC. A solution could be using one or more of the reserved bits to this c=
ase,
something like the Marker-Bit in RTP to allow more BFCP "packets" to comp=
ose a
single BFCP message, but this is only an idea.

What do you think about it?
We're looking forward to receiving your comments and feedback.

See you in Prague,
Lorenzo

--=20
Lorenzo Miniero, Junior Researcher
Dipartimento di Informatica e Sistemistica
Universit=E0 degli Studi di Napoli "Federico II"
Via Claudio 21 -- 80125 Napoli (Italy)
Phone: +390817683821 - Fax: +390817683816
Email: lorenzo.miniero@unina.it





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From: "Pete Cordell" <pete@tech-know-ware.com>
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Subject: [XCON] WG Issues with XML Schema
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I hope this isn't a mis-use of this list, but.....

As you may know, W3C XML Schema is in the process of being extended to 
version 1.1.  I know that XCON started out using XML Schema, but has since 
moved more towards Relax-NG.

I'm hoping that those making that change of direction will share with me 
their motivation for making that decision.  My intention would be, if 
appropriate, to share any gathered opinions with the XSD 1.1 working group 
(probably in some summarized form).  (BTW - Just to be clear, I'm not on the 
WG.)

For example, is XML schema just too difficult to learn?  Is the versioning 
and extensibility of elements, attributes and enumerations too restricted? 
Were there constraints on your syntax that you couldn't (readily) express 
using schema?  What else?

My motivation for doing this is that I feel that the usage scenarios for 
XCON, SIP and other similar IETF style protocols are very different from the 
sorts of use-cases that the majority of the W3C members are familiar with, 
and hence the requirements are under represented.  There's a chance that by 
giving me feedback, XSD 1.1 will do a better job of meeting the needs of 
working groups in the IETF.

I'm interested to hearing from anybody involved in schema work, whether it 
be in XCON, SIP, SIPPING, AVT, some other IETF group, or for private 
purposes.  However, I'm only posting this message to the XCON list in the 
hope this will capture most of the feedback (the membership of the 
previously mentioned groups is probably much the same anyway).

Depending on what you think is appropriate, you can either reply to the 
list, or direct to me.

Many, many thanks for you help in trying to make XSD 1.1. better!

Pete.
--
=============================================
Pete Cordell
Tech-Know-Ware Ltd
for XML to C++ data binding visit
http://www.tech-know-ware.com/lmx/
http://www.codalogic.com/lmx/
=============================================



_______________________________________________
XCON mailing list
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From xcon-bounces@ietf.org Thu Mar 22 08:08:05 2007
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Subject: RE: [XCON] WG Issues with XML Schema
Date: Thu, 22 Mar 2007 13:03:50 +0100
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From: "Oscar Novo \(JO/LMF\)" <oscar.novo@ericsson.com>
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Hi Pete,

I suggest you to read the following e-mail from James Clark:

http://www.imc.org/ietf-xml-use/mail-archive/msg00217.html=20

He's the designer of TREX. RELAX NG is based on TREX and RELAX.
I think in this e-mail he explains very well the motivations inside the
IETF to move towards RELAX NG.

Cheers,

Oscar

-----Original Message-----
From: Pete Cordell [mailto:pete@tech-know-ware.com]=20
Sent: 20. maaliskuuta 2007 19:01
To: xcon@ietf.org
Subject: [XCON] WG Issues with XML Schema

I hope this isn't a mis-use of this list, but.....

As you may know, W3C XML Schema is in the process of being extended to
version 1.1.  I know that XCON started out using XML Schema, but has
since moved more towards Relax-NG.

I'm hoping that those making that change of direction will share with me
their motivation for making that decision.  My intention would be, if
appropriate, to share any gathered opinions with the XSD 1.1 working
group (probably in some summarized form).  (BTW - Just to be clear, I'm
not on the
WG.)

For example, is XML schema just too difficult to learn?  Is the
versioning and extensibility of elements, attributes and enumerations
too restricted?=20
Were there constraints on your syntax that you couldn't (readily)
express using schema?  What else?

My motivation for doing this is that I feel that the usage scenarios for
XCON, SIP and other similar IETF style protocols are very different from
the sorts of use-cases that the majority of the W3C members are familiar
with, and hence the requirements are under represented.  There's a
chance that by giving me feedback, XSD 1.1 will do a better job of
meeting the needs of working groups in the IETF.

I'm interested to hearing from anybody involved in schema work, whether
it be in XCON, SIP, SIPPING, AVT, some other IETF group, or for private
purposes.  However, I'm only posting this message to the XCON list in
the hope this will capture most of the feedback (the membership of the
previously mentioned groups is probably much the same anyway).

Depending on what you think is appropriate, you can either reply to the
list, or direct to me.

Many, many thanks for you help in trying to make XSD 1.1. better!

Pete.
--
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
Pete Cordell
Tech-Know-Ware Ltd
for XML to C++ data binding visit
http://www.tech-know-ware.com/lmx/
http://www.codalogic.com/lmx/
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D



_______________________________________________
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https://www1.ietf.org/mailman/listinfo/xcon

_______________________________________________
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From xcon-bounces@ietf.org Thu Mar 22 09:50:51 2007
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Subject: Re: [XCON] WG Issues with XML Schema
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Many thanks for this Oscar.  If I try and summarise each of James' points, 
I'd be interested know which are, say, the top 4 that you (or any one else 
on the list) were most affected by that led you to move away from XSD (I 
hope the focussed input can be of use to the schema working group):

1. XSD requires significant expertise with things like the merging of 
wildcards in attribute groups being counter-intuitive.

2. The XSD spec is hard to understand and not amenable to being easily 
referred to.

3. XSD does not have a formal theoretical basis behind it (whereas RNG 
does).

4. XSD does not have co-constraints, e.g. you can't make element X and 
attribute Y mutually exclusive.

5. The xs:all (analogous to rng's interleave) feature is too weak.

6. XSD's datatypes are not flexible/open enough (and yet saddled with things 
like gMonthDay).

7. An XSD schema can validate seemingly bogus things such as <bogus/> when 
the schema never actually mentions a bogus element (I hope he's wrong about 
this!).

8. Implicitly defined attributes such as xsi:schemaLocation and xsi:type 
conflict with your ability to define the grammer you want.

9. Allowing the specification of default and fixed values is problematic.

And if I can add a few of my own issues:

10. The rules for wildcards (xs:any) conflicting with element names can make 
versioning of a schema from V1 to V2 problematic.

11. Enumerations are not readily extensible.

12. There's no modularity in the schema definitions such that schema B can 
precisely add extensions to a core schema A.

Many, many thanks,

Pete.
--
=============================================
Pete Cordell
Tech-Know-Ware Ltd
for XML to C++ data binding visit
http://www.tech-know-ware.com/lmx/
http://www.codalogic.com/lmx/
=============================================

----- Original Message ----- 
From: "Oscar Novo (JO/LMF)" <oscar.novo@ericsson.com>
To: "Pete Cordell" <pete@tech-know-ware.com>; <xcon@ietf.org>
Sent: Thursday, March 22, 2007 12:03 PM
Subject: RE: [XCON] WG Issues with XML Schema


Hi Pete,

I suggest you to read the following e-mail from James Clark:

http://www.imc.org/ietf-xml-use/mail-archive/msg00217.html

He's the designer of TREX. RELAX NG is based on TREX and RELAX.
I think in this e-mail he explains very well the motivations inside the
IETF to move towards RELAX NG.

Cheers,

Oscar

-----Original Message-----
From: Pete Cordell [mailto:pete@tech-know-ware.com]
Sent: 20. maaliskuuta 2007 19:01
To: xcon@ietf.org
Subject: [XCON] WG Issues with XML Schema

I hope this isn't a mis-use of this list, but.....

As you may know, W3C XML Schema is in the process of being extended to
version 1.1.  I know that XCON started out using XML Schema, but has
since moved more towards Relax-NG.

I'm hoping that those making that change of direction will share with me
their motivation for making that decision.  My intention would be, if
appropriate, to share any gathered opinions with the XSD 1.1 working
group (probably in some summarized form).  (BTW - Just to be clear, I'm
not on the
WG.)

For example, is XML schema just too difficult to learn?  Is the
versioning and extensibility of elements, attributes and enumerations
too restricted?
Were there constraints on your syntax that you couldn't (readily)
express using schema?  What else?

My motivation for doing this is that I feel that the usage scenarios for
XCON, SIP and other similar IETF style protocols are very different from
the sorts of use-cases that the majority of the W3C members are familiar
with, and hence the requirements are under represented.  There's a
chance that by giving me feedback, XSD 1.1 will do a better job of
meeting the needs of working groups in the IETF.

I'm interested to hearing from anybody involved in schema work, whether
it be in XCON, SIP, SIPPING, AVT, some other IETF group, or for private
purposes.  However, I'm only posting this message to the XCON list in
the hope this will capture most of the feedback (the membership of the
previously mentioned groups is probably much the same anyway).

Depending on what you think is appropriate, you can either reply to the
list, or direct to me.

Many, many thanks for you help in trying to make XSD 1.1. better!

Pete.
--
=============================================
Pete Cordell
Tech-Know-Ware Ltd
for XML to C++ data binding visit
http://www.tech-know-ware.com/lmx/
http://www.codalogic.com/lmx/
=============================================



_______________________________________________
XCON mailing list
XCON@ietf.org
https://www1.ietf.org/mailman/listinfo/xcon

_______________________________________________
XCON mailing list
XCON@ietf.org
https://www1.ietf.org/mailman/listinfo/xcon



_______________________________________________
XCON mailing list
XCON@ietf.org
https://www1.ietf.org/mailman/listinfo/xcon



From xcon-bounces@ietf.org Thu Mar 22 10:30:42 2007
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Subject: RE: [XCON] WG Issues with XML Schema
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From: "Oscar Novo \(JO/LMF\)" <oscar.novo@ericsson.com>
To: "Pete Cordell" <pete@tech-know-ware.com>,
	<xcon@ietf.org>
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Actually, one of the problems we had was with the extensibility of the
schema. Here you have an email from Jari Urpalainen explaining the
issue:

http://www1.ietf.org/mail-archive/web/xcon/current/msg01527.html

Other important problems of XML Schema are number 7 (very critical
one!), 2 and 6.

Hope this information will help you!

Oscar=20
 =20

-----Original Message-----
From: Pete Cordell [mailto:pete@tech-know-ware.com]=20
Sent: 22. maaliskuuta 2007 15:50
To: Oscar Novo (JO/LMF); xcon@ietf.org
Subject: Re: [XCON] WG Issues with XML Schema

Many thanks for this Oscar.  If I try and summarise each of James'
points, I'd be interested know which are, say, the top 4 that you (or
any one else on the list) were most affected by that led you to move
away from XSD (I hope the focussed input can be of use to the schema
working group):

1. XSD requires significant expertise with things like the merging of
wildcards in attribute groups being counter-intuitive.

2. The XSD spec is hard to understand and not amenable to being easily
referred to.

3. XSD does not have a formal theoretical basis behind it (whereas RNG
does).

4. XSD does not have co-constraints, e.g. you can't make element X and
attribute Y mutually exclusive.

5. The xs:all (analogous to rng's interleave) feature is too weak.

6. XSD's datatypes are not flexible/open enough (and yet saddled with
things like gMonthDay).

7. An XSD schema can validate seemingly bogus things such as <bogus/>
when the schema never actually mentions a bogus element (I hope he's
wrong about this!).

8. Implicitly defined attributes such as xsi:schemaLocation and xsi:type
conflict with your ability to define the grammer you want.

9. Allowing the specification of default and fixed values is
problematic.

And if I can add a few of my own issues:

10. The rules for wildcards (xs:any) conflicting with element names can
make versioning of a schema from V1 to V2 problematic.

11. Enumerations are not readily extensible.

12. There's no modularity in the schema definitions such that schema B
can precisely add extensions to a core schema A.

Many, many thanks,

Pete.
--
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
Pete Cordell
Tech-Know-Ware Ltd
for XML to C++ data binding visit
http://www.tech-know-ware.com/lmx/
http://www.codalogic.com/lmx/
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

----- Original Message -----
From: "Oscar Novo (JO/LMF)" <oscar.novo@ericsson.com>
To: "Pete Cordell" <pete@tech-know-ware.com>; <xcon@ietf.org>
Sent: Thursday, March 22, 2007 12:03 PM
Subject: RE: [XCON] WG Issues with XML Schema


Hi Pete,

I suggest you to read the following e-mail from James Clark:

http://www.imc.org/ietf-xml-use/mail-archive/msg00217.html

He's the designer of TREX. RELAX NG is based on TREX and RELAX.
I think in this e-mail he explains very well the motivations inside the
IETF to move towards RELAX NG.

Cheers,

Oscar

-----Original Message-----
From: Pete Cordell [mailto:pete@tech-know-ware.com]
Sent: 20. maaliskuuta 2007 19:01
To: xcon@ietf.org
Subject: [XCON] WG Issues with XML Schema

I hope this isn't a mis-use of this list, but.....

As you may know, W3C XML Schema is in the process of being extended to
version 1.1.  I know that XCON started out using XML Schema, but has
since moved more towards Relax-NG.

I'm hoping that those making that change of direction will share with me
their motivation for making that decision.  My intention would be, if
appropriate, to share any gathered opinions with the XSD 1.1 working
group (probably in some summarized form).  (BTW - Just to be clear, I'm
not on the
WG.)

For example, is XML schema just too difficult to learn?  Is the
versioning and extensibility of elements, attributes and enumerations
too restricted?
Were there constraints on your syntax that you couldn't (readily)
express using schema?  What else?

My motivation for doing this is that I feel that the usage scenarios for
XCON, SIP and other similar IETF style protocols are very different from
the sorts of use-cases that the majority of the W3C members are familiar
with, and hence the requirements are under represented.  There's a
chance that by giving me feedback, XSD 1.1 will do a better job of
meeting the needs of working groups in the IETF.

I'm interested to hearing from anybody involved in schema work, whether
it be in XCON, SIP, SIPPING, AVT, some other IETF group, or for private
purposes.  However, I'm only posting this message to the XCON list in
the hope this will capture most of the feedback (the membership of the
previously mentioned groups is probably much the same anyway).

Depending on what you think is appropriate, you can either reply to the
list, or direct to me.

Many, many thanks for you help in trying to make XSD 1.1. better!

Pete.
--
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
Pete Cordell
Tech-Know-Ware Ltd
for XML to C++ data binding visit
http://www.tech-know-ware.com/lmx/
http://www.codalogic.com/lmx/
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D



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From xcon-bounces@ietf.org Fri Mar 23 05:05:14 2007
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I have posted the raw minutes from our XCON session at:

http://www3.ietf.org/proceedings/07mar/minutes/xcon.htm

Please review and provide clarifications where you believe necessary.

/a

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From xcon-bounces@ietf.org Wed Mar 28 11:14:44 2007
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From: Lorenzo Miniero <lorenzo.miniero@unina.it>
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Dear all,

even though this may be premature, considering the current status and=20
slowness of the ongoing work here in XCON, I'd like to start some seeds=20
of discussion upon a sentitive matter: chat and instant messaging.
As far as I remember from previous discussions, in fact, it was=20
specified that this would have fallen in XCON duties and nowhere else.


That said, starting from some discussions I had with some people on the=20
matter and from the issues which arose there, I have some questions I'd=20
like to know your opinion about.


1) Being XCON a CSP agnostic framework, does this apply to IM protocols=20
too? i.e., will we envisage a gateway functionality for IM protocols as=20
we do for CSP? We've only talked about MSRP so far, but I'm thinking to=20
protocols as IRC, XMPP, etc. as well.

2) Of course, chat and IM mean nicknames... should them be unique in the=20
whole conferencing system or in a specific conference instance only? I=20
tend to prefer the first option, but since the "key" to identify an user=20
will be its XCON userid, this could be not mandatory (even if=20
recommended...) and mostly fall in 'social' and security matters.=20
Besides, in case we choose to have IM gateway functionality, potential=20
conflicts and alignment problems on nicknames could arise which should=20
be addressed.

3) Should nicknames appear in the base data model, or in subsequent=20
extensions? And in both cases, how? Considering the gateway case, a=20
mapping among nicknames in different IM protocols could naturally come=20
from there, as happens for CSP URIs.

4) Will XCON file transfer functionality fall in IM field (since almost=20
all such protocols envisage it), or will we address it in other ways?


That's all. As I said at the beginning, these questions are intended to=20
be only seeds for a hopefully soon-to-start wider discussion upon IM in=20
XCON. I'm looking forward to hear your comments and opinions about these=20
matters.

Regards,
Lorenzo

--=20
Lorenzo Miniero, Junior Researcher
Dipartimento di Informatica e Sistemistica
Universit=E0 degli Studi di Napoli "Federico II"
Via Claudio 21 -- 80125 Napoli (Italy)
Phone: +390817683821 - Fax: +390817683816
Email: lorenzo.miniero@unina.it

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From xcon-bounces@ietf.org Thu Mar 29 05:55:54 2007
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Hi All,
=20
Just want to know if anyone has some document or information about the
mapping of all possible scenario/features of conference in XCON to
MSML(media server markup language). Please reply soon I am in a great
need of it.=20
=20
Ashish Gupta
Project Engineer
ph : +91-9886700830
email - ashish.agupta@wipro.com=20
Wipro Technologies, Bangalore India
www.wipro.com

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Dus-ascii">
<META content=3D"MSHTML 6.00.2900.2963" name=3DGENERATOR></HEAD>
<BODY>
<DIV><FONT face=3DArial size=3D2><SPAN class=3D515364109-29032007>Hi=20
All,</SPAN></FONT></DIV>
<DIV><FONT face=3DArial size=3D2><SPAN=20
class=3D515364109-29032007></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2><SPAN class=3D515364109-29032007>Just =
want to know if=20
anyone has some document or information about the mapping of all =
possible=20
scenario/features of conference in&nbsp;XCON to MSML(media server markup =

language). Please reply soon I am in a great need of=20
it.&nbsp;</SPAN></FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV align=3Dleft><FONT face=3DArial color=3D#0000ff =
size=3D2><STRONG>Ashish=20
Gupta</STRONG></FONT></DIV>
<DIV align=3Dleft><SPAN class=3D515364109-29032007><FONT face=3DArial =
color=3D#0000ff=20
size=3D2><STRONG>Project Engineer</STRONG></FONT></SPAN></DIV>
<DIV align=3Dleft><SPAN class=3D515364109-29032007><STRONG><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>ph : =
+91-9886700830</FONT></STRONG></SPAN></DIV>
<DIV align=3Dleft><SPAN class=3D515364109-29032007><STRONG><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>email - <A=20
href=3D"mailto:ashish.agupta@wipro.com">ashish.agupta@wipro.com</A>=20
</FONT></STRONG></SPAN></DIV>
<DIV align=3Dleft><SPAN class=3D515364109-29032007><STRONG><FONT =
face=3DArial=20
color=3D#0000ff size=3D2>Wipro Technologies, Bangalore=20
India</FONT></STRONG></SPAN></DIV>
<DIV align=3Dleft><SPAN class=3D515364109-29032007><STRONG><FONT =
face=3DArial=20
color=3D#0000ff size=3D2><A=20
href=3D"http://www.wipro.com">www.wipro.com</A></FONT></STRONG></SPAN></D=
IV></BODY></HTML>

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Lorenzo Miniero wrote:

> 2) Of course, chat and IM mean nicknames... should them be unique in the 
> whole conferencing system or in a specific conference instance only? I 
> tend to prefer the first option, but since the "key" to identify an user 
> will be its XCON userid, this could be not mandatory (even if 
> recommended...) and mostly fall in 'social' and security matters. 
> Besides, in case we choose to have IM gateway functionality, potential 
> conflicts and alignment problems on nicknames could arise which should 
> be addressed.

I think nicknames would best be handled by simply getting an AOR from a 
suitable "nickname provider". You could actually register with this 
provider, or it could simply retarget requests to some other AOR you 
own. If need be you could bundle this with an anonymizer or use a 
separate anonymizer as well.

There could be some advantages to collocating such a provider with a 
conference server, but thats just an implementation issue.

	Paul

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