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XCON                                                             O. Novo
Internet-Draft                                              G. Camarillo
Expires: December 28, 2006                                      Ericsson
                                                               D. Morgan
                                                    Fidelity Investments
                                                                 R. Even
                                                                 Polycom
                                                           June 26, 2006


A Common Conference Information Data Model for Centralized Conferencing
                                 (XCON)
                draft-ietf-xcon-common-data-model-01.txt

Status of this Memo

   By submitting this Internet-Draft, each author represents that any
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   This Internet-Draft will expire on December 28, 2006.

Copyright Notice

   Copyright (C) The Internet Society (2006).

Abstract

   This document collects, organizes, and describes the conference
   variables that have been introduced in various protocol drafts of the
   XCON and SIPPING working groups.  The goal of this document is to



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   allow the conference control protocols to use a unified common
   conference information data model for XCON.  This document formally
   defines an Extensible Markup Language (XML) Schema that represents
   the common conference information in a conferencing server.  The
   information is modeled as a series of elements, each of which
   contains a set of children and attributes.


Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  4
   3.  Common Conference Data . . . . . . . . . . . . . . . . . . . .  4
     3.1.  General  . . . . . . . . . . . . . . . . . . . . . . . . .  4
     3.2.  <conference-description> . . . . . . . . . . . . . . . . . 10
       3.2.1.  <conference-time>  . . . . . . . . . . . . . . . . . . 11
       3.2.2.  <conf-uris>  . . . . . . . . . . . . . . . . . . . . . 13
       3.2.3.  <service-uris> . . . . . . . . . . . . . . . . . . . . 13
       3.2.4.  <maximum-user-count> . . . . . . . . . . . . . . . . . 13
       3.2.5.  <available-media>  . . . . . . . . . . . . . . . . . . 13
     3.3.  <host-info>  . . . . . . . . . . . . . . . . . . . . . . . 14
     3.4.  <conference-state> . . . . . . . . . . . . . . . . . . . . 14
     3.5.  <security-mechanism> . . . . . . . . . . . . . . . . . . . 14
       3.5.1.  <methods>  . . . . . . . . . . . . . . . . . . . . . . 15
       3.5.2.  <option-tags>  . . . . . . . . . . . . . . . . . . . . 15
       3.5.3.  <feature-tags> . . . . . . . . . . . . . . . . . . . . 15
       3.5.4.  <bodies> . . . . . . . . . . . . . . . . . . . . . . . 15
     3.6.  <floor-information>  . . . . . . . . . . . . . . . . . . . 16
     3.7.  <users>  . . . . . . . . . . . . . . . . . . . . . . . . . 17
       3.7.1.  <dial-in-list> . . . . . . . . . . . . . . . . . . . . 18
         3.7.1.1.  <external> . . . . . . . . . . . . . . . . . . . . 18
       3.7.2.  <dial-out-list>  . . . . . . . . . . . . . . . . . . . 19
       3.7.3.  <refer-list> . . . . . . . . . . . . . . . . . . . . . 19
       3.7.4.  <privileges-control-list>  . . . . . . . . . . . . . . 19
         3.7.4.1.  <data-access-rights> . . . . . . . . . . . . . . . 19
         3.7.4.2.  <conference-rules> . . . . . . . . . . . . . . . . 20
           3.7.4.2.1.  <condition>  . . . . . . . . . . . . . . . . . 20
             3.7.4.2.1.1.  <external-list>  . . . . . . . . . . . . . 21
             3.7.4.2.1.2.  <pseudonymous> . . . . . . . . . . . . . . 21
             3.7.4.2.1.3.  <has-been-referred>  . . . . . . . . . . . 21
             3.7.4.2.1.4.  <has-been-invited> . . . . . . . . . . . . 21
             3.7.4.2.1.5.  <has-been-in-conference> . . . . . . . . . 21
             3.7.4.2.1.6.  <is-in-conference> . . . . . . . . . . . . 21
             3.7.4.2.1.7.  <administrator>  . . . . . . . . . . . . . 21
             3.7.4.2.1.8.  <is-on-dialout-list> . . . . . . . . . . . 22
             3.7.4.2.1.9.  <is-on-refer-list> . . . . . . . . . . . . 22
             3.7.4.2.1.10. <participant-passcode> . . . . . . . . . . 22
             3.7.4.2.1.11. <administrators-passcode>  . . . . . . . . 22



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           3.7.4.2.2.  <actions>  . . . . . . . . . . . . . . . . . . 23
       3.7.5.  <user> . . . . . . . . . . . . . . . . . . . . . . . . 24
     3.8.  <sidebars-by-ref>  . . . . . . . . . . . . . . . . . . . . 25
     3.9.  <sidebars-by-val>  . . . . . . . . . . . . . . . . . . . . 25
     3.10. Template . . . . . . . . . . . . . . . . . . . . . . . . . 25
       3.10.1. <template-by-val>  . . . . . . . . . . . . . . . . . . 26
       3.10.2. <template-by-ref>  . . . . . . . . . . . . . . . . . . 26
   4.  XML Schema . . . . . . . . . . . . . . . . . . . . . . . . . . 26
   5.  XML Schema Extensibility . . . . . . . . . . . . . . . . . . . 40
   6.  XML example  . . . . . . . . . . . . . . . . . . . . . . . . . 41
   7.  Security Considerations  . . . . . . . . . . . . . . . . . . . 51
   8.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 51
   9.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 51
   10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 51
     10.1. Normative References . . . . . . . . . . . . . . . . . . . 51
     10.2. Informative References . . . . . . . . . . . . . . . . . . 52
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 53
   Intellectual Property and Copyright Statements . . . . . . . . . . 54

































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1.  Introduction

   This document defines an Extensible Markup Language (XML) Schema that
   represents the common conference information in a conferencing
   server.  The information is modeled as a series of elements, each of
   which contains children and attributes.

   The common conference information is a part of the Conference Object.
   The Conference Object contains two components: the "Common Conference
   Information" component and the "Conference Template" component.  The
   common conference information component contains the XML schema,
   which is used to represent the core information that is utilized in
   any conference (capabilities,membership, roles, call control
   signalling, media, etc...) and specifies the set of rights,
   permissions and limitations pertaining to operations being performed
   on a certain Conference Object.

   This document gives an overview of the conference variables that have
   been introduced in various protocol drafts of the XCON working group
   to date and proposes to create a unified common conference
   information data model for XCON.

   This document has been constructed in compliance with the XCON
   Framework [1] and the Session Initiation Protocol (SIP) Event Package
   for Conference State [2].  It also incorporates data elements
   proposed in several XCON WG and SIPPING WG drafts.

   [Editors Note: This document is still in early stages of development
   and is intended to trigger discussions.]


2.  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL
   NOT","SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in
   this document are to be interpreted as described in RFC-2119 [3].

   This document uses the terminology defined in the XCON Conferencing
   Framework [1] and the SIPPING Conferencing Framework [4].  In
   addition, it uses definitions from The Binary Floor Control Protocol
   [7].


3.  Common Conference Data

3.1.  General

   The conference object data model document is an XML [5] document that



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   MUST be well formed and SHOULD be valid.  Conference object data
   model documents MUST be based on XML 1.0 and SHOULD be encoded using
   UTF-8.

   A Common Conference information document begins with the root element
   tag <conference-info> of conference-type.  The <conference-info> has
   the attribute 'entity' that contains the conference unique identifier
   that identifies the conference being described in the document.

   The <conference-info> element is comprised of <conference-
   description>, <host-info>, <conference-state>, <security-mechanism>,
   <Floor Information>, <users>, <sidebars-by-ref>, <sidebars-by-val>,
   <template-by-ref>, and <template-by-val> child elements.  A common
   conference document must at least include the <conference-
   description>, <host-info>, <conference-state>, <available-media>, and
   <users> child elements.  Some of this information can be represented
   using the conference-info-type schema as defined in [2].

   Changes in the state of the conference should be communicated to the
   subscribers using a conference package subscribers (ex.  A Session
   Initiation Protocol (SIP) Event Package for Conference State).
   Critical changes should be communicated to specific subscribers,
   perhaps those with unique roles.  The conference policy control
   protocol msy be used to retrieve the conference state at any time.

   The following non-normative diagram gives an example of the overall
   hierarchy used in this format.  The operator "!" preceding an element
   indicates that this element is MANDATORY in the data model.  The
   operator "*" preceding an element indicates that this element is
   introduced/proposed in this draft.

   [Editors Note: The non-normative diagram will be remove in the
   following versions of the draft.  Its uses is only to make easier the
   reader to see the hierarchical position of the elements.]

   !<conference-info>
        |
        |--!<conference-description>
        |     |--<display-text>
        |     |--<subject>
        |     |--<free-text>
        |     |--<keywords>
        |     |--<web-page>
        |     |--<security-level>
        |     |--<allow-sidebars>
        |     |--<conference-stage>*
        |     |--<conference-time>
        |     |      |--<entry>



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        |     |      |    |--<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>
        |     |           ...
        |     |--<conf-uris>
        |     |      |--<SIP>
        |     |      |    |--<uri>
        |     |      |    |--<display-text>
        |     |      |    |--<purpose>
        |     |      |--<H323>
        |     |      |    |--<H.323-alias>
        |     |      |    |--<H.323-URI>
        |     |      |--<PSTN/ISDN>
        |     |      |    |--<phone number>
        |     |      |    |--<PIN-code>
        |     |      |    |--<rate>*
        |     |      |--<BFCP>
        |     |      |    |--<conference-ID>
        |     |      ...
        |     |--<service-uris>
        |     |      |--<SIP>
        |     |      |    |--<uri>
        |     |      |    |--<display-text>
        |     |      |    |--<purpose>
        |     |      |--<H323>
        |     |      |    |--<H.323-alias>
        |     |      |    |--<H.323-URI>
        |     |      |--<PSTN/ISDN>
        |     |      |    |--<phone number>
        |     |      ...
        |     |--<maximum-user-count>
        |     |      |--<entry>
        |     |      |--<entry>
        |     |      ...
        |     |--!<available-media>
        |     |      |--!<entry>
        |     |      |     |--<type>
        |     |      |     |--<display-text>
        |     |      |     |--<status>
        |     |      |     |--<mixing-mode>
        |     |      |     |--<mix level>
        |     |      |     |--<codecs>
        |     |      |     |    |--<entry>



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        |     |      |     |    |--<entry>
        |     |      |     |    ...
        |     |      |--<entry>
        |     |      |     |--<type>
        |     |      |     |--<display-text>
        |     |      |     |--<status>
        |     |      |     |--<mixing-mode>
        |     |      |     |--<mix level>
        |     |      |     |--<codecs>
        |     |      |     |    |--<entry>
        |     |      |     |    |--<entry>
        |     |      |     |    ...
        |     |      ...
        |
        |--!<host-info>
        |     |--<display-text>
        |     |--<web-page>
        |     |--!<uris>
        |     |     |--!<SIP>
        |     |     |     |--!<uri>
        |     |     |     |--<display-text>
        |     |     |     |--<purpose>
        |     |     |--<H323>
        |     |     |    |--<H.323-alias>
        |     |     |    |--<H.323-URI>
        |     |     |--<PSTN/ISDN>
        |     |     |    |--<phone number>
        |           ...
        |--!<conference-state>
        |     |--<allow-conference-state>
        |     |--<user-count>
        |     |--!<active>
        |     |--<locked>
        |
        |--<security-mechanism>
        |     |--<entry-protocol=SIP>
        |     |     |--<methods>
        |     |     |     |--<method>
        |     |     |     ...
        |     |     |--<option-tags>
        |     |     |     |--<option-tag>
        |     |     |     ...
        |     |     |--<feature-tags>
        |     |     |     |--<feature-tag>
        |     |     |     ...
        |     |     |--<bodies>
        |     |     |     |--<body-disposition>
        |     |     |     |    |--<body-format>



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        |     |     |     ...
        |     |--<entry-protocol=H.323>*
        |     |     |--<version>*
        |     |--<entry-protocol=H.320>*
        |     |     |--<supported>*
        |     ...
        |
        |--<floor-information>
        |     |--<allow-floor-events>
        |     |--<floor-request-handling>
        |     |--<conference-floor-policy>
        |     |     |--<floor>
        |     |     |    |--<media-types>
        |     |     |    |--<algorithm>
        |     |     |    |--<max-floor-users>
        |     |     |    |--<moderator-uri>
        |     |     |    |--<moderator-uri>
        |     |     |   ...
        |     |     ...
        |
        |--!<users>
        |     |--<join-handling>
        |     |--<user-admission-policy>
        |     |--<dial-in-list>
        |     |     |--<target>
        |     |     |-- ...
        |     |
        |     |--<dial-out-list>
        |     |     |--<target>
        |     |     |-- ...
        |     |     |--<external>
        |     |     |-- ...
        |     |
        |     |--<refer-list>
        |     |     |--<target>
        |     |     |-- ...
        |     |     |--<external>
        |     |     |-- ...
        |     |
        |     |--<privileges-control-list>
        |     |    |--<data-access-rights>
        |     |    |      |--<entry name=sidebars-by-ref>
        |     |    |      |--<entry name=sidebars-by-val>
        |     |    |      |--<entry name=conference-time>
        |     |    |      |--<entry name=mixing-start-offset>
        |     |    |     ...
        |     |    |
        |     |    |--<conference-rules>



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        |     |    |     |--<entry>
        |     |    |     |     |--<condition>
        |     |    |     |     |     |--<identity>
        |     |    |     |     |     |     |
        |     |    |     |     |     |     ...
        |     |    |     |     |     |
        |     |    |     |     |     |--<validity>
        |     |    |     |     |     |     |--<from>
        |     |    |     |     |     |     |--<until>
        |     |    |     |     |
        |     |    |     |     |--<actions>
        |     |    |     |     |     |
        |     |    |     |     |     ...
        |     |    |    ...
        |     |
        |     |--!<user>
        |     |    |--<display-text>
        |     |    |--<associated-aors>
        |     |    |--<provide-anonymity>
        |     |    |--<roles>
        |     |    |    |
        |     |    |   ...
        |     |    |--<languages>
        |     |    |--<cascaded-focus>
        |     |    |--<sphere>
        |     |    |--<allow-refer-users-dynamically>
        |     |    |--<allow-invite-users-dynamically>
        |     |    |--<allow-remove-users-dynamically>
        |     |    |--<floors>
        |     |    |     |--<entry>
        |     |    |     |     |--<show-floor-holder>
        |     |    |     |     |--<show-floor-requests>
        |     |    |     ...
        |     |    |--<endpoint>
        |     |    |      |--<display-text>
        |     |    |      |--<referred>
        |     |    |      |--<status>
        |     |    |      |--<joining-method>
        |     |    |      |--<joining-info>
        |     |    |      |--<disconnection-method>
        |     |    |      |--<disconnection-info>
        |     |    |      |--<media>
        |     |    |      |    |--<type>
        |     |    |      |    |--<display-text>
        |     |    |      |    |--<label>
        |     |    |      |    |--<src-id>
        |     |    |      |    |--<status>
        |     |    |      |   ...



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        |     |    |      |--<call-info>
        |     |    |      |    |--<sip>
        |     |    |      |    |   |--<display-text>
        |     |    |      |    |   |--<call-id>
        |     |    |      |    |   |--<from-tag>
        |     |    |      |    |   |--<to-tag>
        |          ...    ...
        |--<sidebars-by-ref>
        |     |--<entry>
        |     |     |-- <user>
        |     |     |-- <display-text>
        |     |--<entry>
        |     |     |-- <user>
        |     |     |-- <display-text>
        |     ...
        |--<sidebars-by-val>
        |     |--<entry>
        |     |     |
        |     |    ...
        |     |--<entry>
        |     |     |
        |     ...   ...
        |--<template-by-val>
        |--<template-by-ref>
        |     |-<urn>
        |     |-<display-text>
        ...


   The following sections describe these elements in detail.  The full
   XML schema is provided in Section 4.

3.2.  <conference-description>

   The <conference-description> element describes the conference in its
   entirely.  It SHOULD have an extra attribute 'xml:lang' to specify
   the language used in the contents of this element as defined Section
   2.12 of [5].  It is comprised of <display-text>, <subject>, <free-
   text>, <keywords>, <web-page>, <security-level>, <allow-sidebars>,
   <conference-stage>, <conference-time>, <conf-uris>, <service-uris>,
   <maximum-user-count>, and <available-media>.

   The child elements <display-text>, <subject>, <free-text> and
   <keywords> are used to describe the conference content.  These
   elements are defined in [2].

   The child element <web-page> is an optional element that points to a
   URI with additional information about the conference.  The child



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   elements <security-level> and <allow-sidebars> describe the
   capabilities of the conference.

   The <conference-stage> is a mandatory element that give the stage of
   the conference.  This element can have 4 values: reserved, started,
   running, and ended.  At the reserved stage the conference exists only
   in the conference control server.  There is no running focus and
   there are no subscribers or notifications.  The information is
   accessible only via the conference control protocol.  At the started
   stage, there are no users yet in the conference, still it is possible
   to subscribe to the conference state.  The running stage starts when
   the first user joins the conference.  In the ended stage, there are
   no users connected to the conference, the conference information is
   only in the conference server for recurring conference or for CDR.
   At this stage a user can get information only from the conference
   control protocol.  For instance, The Session Initiation Protocol
   (SIP) Event Package for Conference State [2] is only applicable in
   the start and running stage.

   The <conference-time> child element has information related to
   conference time and duration of the conference.  Other elements from
   different namespaces MAY be present for the purposes of
   extensibility.  The <conf-uris> and <service-uris> are used to
   describe the conference-related identifiers.  The <maximum-user-
   count> child element indicates the number of users that can be
   invited to the conference.  The <available-media> child element is
   used to describe the media characteristics of the conference.

   The following sections describe the remaining elements in more
   detail.  Other child elements can be used to extend <conference-
   description> in the future.

3.2.1.  <conference-time>

   The <conference-time> element contains the information related to
   conference time and duration of a conference.  The <conference-time>
   element contains one or more <entry> elements each defining the time
   information of a single conference occurrence.

   Every <entry> element contains a <mixing-start-offset> child element
   that specifies when conference media mixing starts before the
   conference starts, <mixing-end-offset> child element that specifies
   the time a conference media mixing stops after the conference stops.
   The <mixing-end-offset> child element expresses the offset as signed
   integers representing seconds before/after DTEND field.  The <mixing-
   start-offset> child element expresses the offset as signed integers
   representing seconds before/after DTSTART field.  If the <mixing-
   start-offset> element is not present, it indicates that the



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   conference media mixing starts immediately.  If the <mixing-end-
   offset> element is not present, it indicates that the conference
   occurrence is not bounded. <mixing-start-offset> and <mixing-end-
   offset> elements both have the mandatory 'require-participant'
   attribute.  This attribute has one of 4 values: 'none',
   'administrator', 'moderator', and 'participant'.  For mixing start
   offset, this attribute allows a privileged user to define when media
   mixing starts based on the latter of the mixing start time, and the
   time the first participant, administrator, or moderator arrives.  If
   the value is set to 'none', mixing starts according to the mixing
   start time.  For mixing end offset, this attribute allows a
   privileged user to define when media mixing ends based on the earlier
   of the mixing end offset, and the time the last participant, or
   moderator leaves.  If the value is set to 'none', mixing stops
   according to the mixing end offset.  If the conference policy was
   modified so that last privileged user is now a normal conference
   participant, and the conference requires a privileged user to
   continue; that conference MUST terminate.

   An administrator can indicate the time when users can join a
   conference by populating the <can-join-after-offset> element.
   Similarly, an administrator can define the time after which new users
   are not allowed to join the conference anymore.  This is done by
   populating the <must-join-before-offset> element expressing the
   offset as signed integers representing seconds before/after DTSTART
   field.

   The <base> child element specifies the iCalendar object of the
   conference.  The iCalendar object components are defined in [6].

   The <entry> element also contains the <request-user> child element.
   It is possible to define the time when users or resources on the
   dial-out list and on the refer-list are requested to join the
   conference by using the <request-users> element.  This element
   expresses the offset as signed integers representing seconds before/
   after DTSTART field.

   The <notify-end-of-conference> element defines in seconds when the
   system has to send a notification when the end of the conference is
   near.  If the <notify-end-of-conference> element is not present, it
   indicates that the system does not notify the users when the end of
   the conference is near.  The <notify-end-of-conference> child element
   expresses the offset as signed integers representing seconds before/
   after DTSTART field.  The <allowed-extend-mixing-end-offset> refers
   to the possibility to extend the conference.  It has two values:
   allowed, denied.





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3.2.2.  <conf-uris>

   The <conf-uris> contains the identifiers to be used in order to
   access the conference by different signaling means.  It contains a
   sequence of child elements: <SIP>, <H.323>, and <PSTN/ISDN>.  The
   <SIP> element contains the <uri>, <display-text>, and <purpose>.
   <uri>, <display-text>, and <purpose> are described in [2].  The
   <H.323> element includes either a <H.323-alias> or a <H.323-URI>
   child elements.  The <PSTN/ISDN> has an attribute 'PIN code' with the
   PIN code of the conference if used and a 'purpose' attribute that
   describes to the user which phone number to use. <PSTN/ISDN> element
   may include 1 or more <phone number> child elements and the call rate
   as well.

3.2.3.  <service-uris>

   The <service-uris> describes auxiliary services available for the
   conference.  It contains a sequence of child elements: <SIP>,
   <H.323>, <PSTN/ISDN>, and <BFCP>. <SIP> child element contains <uri>,
   <display-text>, and <purpose>.  The purpose will be used to describe
   the service.  These elements are described in [2]. <H.323>, and
   <PSTN/ISDN> child elements are described in <conf-uris> section.  The
   <BFCP> has a sub-element <conference-ID> that are used by a floor
   control server to provide a client with a conference ID.

3.2.4.  <maximum-user-count>

   The <maximum-user-count> contains the overall number of users allowed
   to join the conference.  It contains a sequence of <entry> child
   elements.  An <entry> element MAY contain the number of users with a
   specific role allowed to join the conference [8].

3.2.5.  <available-media>

   The <available-media> has the 'label' attribute that is the media
   stream identifier assigned by the conferencing server.  This element
   contains a sequence of <entry> child elements of conference-medium-
   type.  Each <entry> element contains the <type>, <display-text>,
   <status>, <mixing-mode>, <mix level> and <codecs> child elements.
   The attribute 'label' and the <type>, <display-text>, and <status>
   elements are described in [2].  The <codecs> element specifies the
   allowed codecs in the conference.  It has an attribute 'decision'
   that specifies if the focus decides the common codec automatically or
   needs the approvement of the moderator of the conference (automatic,
   moderator-controlled).  The <codecs> element contains a <entry>
   elements.  A <entry> element can have the attribute 'name' and
   'policy'.  The 'name' attribute identifies a codec, and the
   'decision' attribute and the policy attribute contains the policy for



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   that codec (allowed, or disallowed).

   The child elements <mixing-mode>, <mix level> describe a default
   policy by which the mixer will build the outgoing stream from the
   incoming streams.  Notice that this policy is different that the
   policy describe for the floors for each media.  The <mix level> child
   element describes the number of participants in audio media streams
   or the number of sub-windows in video media streams (for instance, a
   value of 4 in the <mix level> element for video stremas means 2x2
   layout).  The <mixing-mode> child element MUST contain one and only
   one of the "Moderator-controlled", "FCFS", and "Automatic" values
   indicating the default algorithm to be use with every media stream.

3.3.  <host-info>

   The <host-info> element contains information about the entity hosting
   the conference.  It contains the <display-text>, <web-page> child
   elements.  These child elements are explained in [2]. <host-info>
   contains the <uris> child element as well. <uris> contains a sequence
   of child elements: <SIP>, <H.323>, and <PSTN/ISDN>.  The child
   elements of <uris> are described in <conf-uris> section.

3.4.  <conference-state>

   The <conference-state> element and the <user-count>, <active>, and
   <locked> child element are explained in section 5.5 of [2].  The
   <allow-conference-state> element represents a boolean action.  If set
   to TRUE, the focus is instructed to allow the subscription to
   conference state events, such as the SIP Event Package for Conference
   State [2].  If set to FALSE, the subscription to conference state
   events would be rejected.  If this element is undefined it has a
   value of TRUE, causing the subscription to conference state events to
   be accepted.

3.5.  <security-mechanism>

   The <security-mechanism> contains a series of <entry-protocol> sub-
   elements.  The <entry-protocol> element has a single mandatory
   attribute, 'name'.  The 'name' attribute identifies a protocol the
   policy of each protocol element is referring to.  Each <entry-
   protocol> sub-element contains the policy related to the usage of a
   particular protocol.

   The <entry-protocol> element has a series of child elements: methods,
   option-tags, feature-tags, and bodies are defined for the SIP
   protocol.  These elements are described in the following sections.
   H.323 protocol has a sub element <version> that says which version of
   H.323 is supported.  H.320 protocol has a sub element <supported>



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   that says if H.320 is supported or not.

3.5.1.  <methods>

   The <methods> element contains a default-policy attribute and
   <method> elements.  The default-policy attribute contains the policy
   for methods that are not listed as <method> elements.  A <method>
   element has two attributes: name and policy.  The name attribute
   identifies a method, and the policy attribute contains the policy for
   that method (allowed or disallowed).

3.5.2.  <option-tags>

   The <option-tags> element contains a default-policy attribute and
   <option-tag> elements.  The default-policy attribute contains the
   policy for option-tags that are not listed as <option-tag> elements.
   An <option-tag> element has two attributes: name and policy.  The
   name attribute identifies a method, and the policy attribute contains
   the policy for that method (mandatory, allowed, or disallowed).

3.5.3.  <feature-tags>

   The <feature-tags> element contains a default-policy attribute and
   <feature-tag> elements.  The default-policy attribute contains the
   policy for feature-tags that are not listed as <feature-tag>
   elements.  A <feature-tag> element has two attributes: name and
   policy.  The name attribute identifies a method, and the policy
   attribute contains the policy for that method (allowed, or
   disallowed).

3.5.4.  <bodies>

   The <bodies> element contains a default-policy attribute, a default-
   encryption attribute and <body-disposition> elements.  The default-
   policy attribute contains the policy for body dispositions that are
   not listed as <body-disposition> elements.  The default-encryption
   attribute contains the encryption policy for body dispositions that
   are not listed as <body-disposition> elements.

   A <body-disposition> element can have a number of attributes: name,
   policy, default-policy, and encryption.  The name attribute
   identifies a body-disposition, and the policy attribute contains the
   policy for that body-disposition (allowed, or disallowed).  The
   default-policy attribute contains the policy for body formats that
   are not listed as <body-format> elements.  The encryption attribute
   indicates whether or not encryption is allowed for a particular body
   disposition.




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   A <body-disposition> element contains <body-format> elements.  A
   body-format element can have a two attributes: name and policy.  The
   name attribute identifies a <body-format>, and the policy attribute
   contains the policy for that body-format (allowed or disallowed).

3.6.  <floor-information>

   The <floor-information> element has the <allow-floor-events>, <floor-
   request-handling>, and the <conference-floor-policy> child elements.
   Other elements from different namespaces MAY be present for the
   purposes of extensibility.  This element has its own XML namespace.
   The absence of this namespace and its elements from an XML document
   indicates that the conference does not have a floor.

   The <allow-floor-events> element represents a boolean action.  If set
   to TRUE, the focus is instructed to accept the subscription to floor
   control events.  If set to FALSE, the focus is instructed to reject
   the subscription.  If this element is undefined, it has a value of
   FALSE, causing the subscription to floor control events to be
   rejected.

   The <floor-request-handling> element defines the actions used by the
   conference focus to control floor requests.  This element defines the
   action that the focus is to take when processing a particular request
   to a floor within a conference.  This element defines values of:
   o  block: This action instructs the focus to deny the floor request.
      This action is the default action taken in the absence of any
      other actions.
   o  confirm: This action instructs the focus to allow the request.
      The focus then uses the defined floor algorithm to further allow
      of deny the floor.  The algorithms used are outside the scope of
      this document.

   Note that placing a value of block for this element does not
   guarantee that a participant is blocked from joining the conference.
   Any other rule that might evaluate to true for this participant that
   carried an action whose value was higher than block would
   automatically grant confirm/allow permission to that participant.

   The <conference-floor-policy> element is mandatory and contains the
   required boolean attribute that indicates if the floor is moderator
   controlled or not.  One or more <Floor> elements can appear in the
   <conference-floor-policy> element.  Every floor is defined using the
   'label' attribute.  The number of those elements indicates how many
   floors the conference can have.  A floor can be used for one or more
   media types; the mandatory <Media-types> element can contain zero or
   more of the <Video>, <Audio>, <Application>, <Data> ,<Control>,
   <Message>, and <text> elements indicating the media of the floor.



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   One type of media can only appear once.  Other media types can be
   defined by extensions.

   A floor can be controlled using many algorithms; the mandatory
   <Algorithm> element MUST contain one and only of the <Moderator-
   controlled>, <FCFS>, and <Random> elements indicating the algorithm.

   The <Max-floor-users> element in the <Floor> element is optional and,
   if present, dictates the maximum number of users who can have the
   floor at one time.  The optional <Moderator-URI> indicates the URI of
   the moderator.  It MUST be set if the attribute moderator-controlled
   is set to "true".

3.7.  <users>

   The <users> element contains the <join-handling>, <user-admission-
   policy>, <dial-in-list>, <dial-out-list>, <refer-list>, <privileges-
   control-list> and <user> child elements.

   The <join-handling> element defines the actions used by the
   conference focus to control conference participation.  This element
   defines the action that the focus is to take when processing a
   particular request to join a conference.  This element defines values
   of:
   o  block: This action instructs the focus to deny access to the
      conference.  This action is the default action taken in the
      absence of any other actions.
   o  confirm: This action instructs the focus to place the participant
      on a pending list (e.g., by parking the call on a music-on-hold
      server), awaiting moderator input for further actions.
   o  allow: This action instructs the focus to accept the conference
      join request and grant access to the conference within the
      instructions specified in the transformations of this rule.
   o  IVR: This action instructs the focus that the user has to define
      the PIN code.
   o  directed-operator: This action instructs the focus to direct the
      user to an operator.

   Note that placing a value of block for this element does not
   guarantee that a participant is blocked from joining the conference.
   Any other rule that might evaluate to true for this participant that
   carried an action whose value was higher than block would
   automatically grant confirm/allow permission to that participant.

   The <user-admission-policy> element is a list of three elements:
   'closedAuthenticated', 'openAuthenticated', and 'anonymous'.  If the
   <user-admission-policy> element is set to 'closedAuthenticated',
   users must be specified (and authenticate).  If the attribute is set



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   to 'openAuthenticated', users can be add after conference activation.

   The following sections describe the remaining elements in more
   detail.  Other child elements can be used to extend <conference-
   description> in the future.

3.7.1.  <dial-in-list>

   The <dial-in-list> child element contains a list of user URIs, PSTN
   phone numbers, roles, or domains (*@example.com) that the focus uses
   to determine who can join the conference.  The <dial-in-list> element
   includes zero or more <target> child element and zero or more
   <external> child element.  Those two child elements includes the
   mandatory 'uri' attribute.  The use of the <external> element is
   described below these lines.  If users are specified in this list,
   the system does not need any IVR to ask the user for conference ID
   since the system knows according, for instance, to the "contact" in
   SIP or calling number in PSTN, to which conference to connect the
   user.

3.7.1.1.  <external>

   An external list is a list of resources created by means outside the
   scope of this document.  A privileged user of the conference policy
   uses an external list by placing its URI in an conference policy
   element that is dedicated to carrying external list URIs.  The
   external list URI is the URI used to manipulate the list and not the
   URI used to signal to the list.

   At the time the focus needs to activate the policy surrounding the
   URI, the focus fetches the URIs for the members of the external list
   using the list URI.  For example, a conference creator creates a
   conference and places the URI of an external list in the dial-out
   list.  At some point, the focus needs to invite using on the dial-out
   list to join the conference.  It is at that moment that the focus
   retrieves the members of the external list.  It then sends INVITE (in
   SIP terms) to the members of that external list.  This results in all
   participants connected to one focus.

   It can happen that the external list is not accessible at the time
   the focus requires it.  In this case, the external list is ignored,
   and in the case of an authorization rule, that rule fails.

   There are also cases where the external list has been manipulated.
   It is outside the scope of this document how the focus can learn of
   such manipulation.  But if is does, it reacts in a similar manner as
   it would have if the list was local and has been modified.




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   If an external list contains a reference to yet another list, that
   referenced list is also fetched if the focus has not already done so.
   This is to avoid list loops.

3.7.2.  <dial-out-list>

   The <dial-out-list> child element contains a list of user URIs, or
   PSTN phone numbers that the focus uses to determine who to invite to
   join a conference.  The <dial-out-list> element includes zero or more
   <target> child element and zero or more <external> child element.
   Those two child elements includes the mandatory 'uri' attribute.

3.7.3.  <refer-list>

   The <refer-list> child element contains a list of resources that the
   focus needs to "refer to" the conference.  In SIP, this is achieved
   by the focus sending a REFER request to those potential participants.
   In a different paradigm, this could also mean that the focus sends an
   SMS or an email to the referred user.  This list can be updated
   during the conference lifetime so it can be used for mid-conference
   refers as well.

   The <refer-list> child element differs from the Dial-out-list in that
   the dial-out-list contains a list of resources that the focus will
   initiate a session with.  The resources on the refer list, on the
   other hand, are expected to initiate the session establishment
   towards the focus themselves.  It is also envisioned that difference
   users will have different access rights to those lists and therefore
   a separation between the two is needed.

3.7.4.  <privileges-control-list>

   The <privileges-control-list> refers to a virtual set of rights,
   permissions and limitations pertaining to operations.  This element
   contains the <data-access-rights> and the <conference-rules>.

3.7.4.1.  <data-access-rights>

   The <data-access-rights> element describes the read/write access
   privileges for accessing the Conference Object as a whole.  It is
   partially described in [1].  The <data-access-rights> contains a list
   of <entry> elements defined in the Conference Object.  Every element
   has three attributes: the attribute 'name', 'read-only', and the
   attribute 'read-write'.  When the conferencing server receives a
   request for access to privacy-sensitive data it needs to match it
   against the 'read-only' and the 'read-write' attributes.  Each
   attribute of each individual element is evaluated and as a result it
   is determined if the user can access that element.  The attributes



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   specify the minimum subscriber's role that can access or modify the
   element of the conference.  Subscribers with a lower role cannot
   access or modify the element.  If an element is not defined in the
   <data-access-rights> then the 'read-only' attribute MUST be
   interpreted as a "participant" and the 'read-write' attribute MUST be
   interpreted as an "administrator" by default.  It is possible to
   defined only one of the attributes of the element, the other
   attribute SHOULD be interpreted by default.  This draft does not
   define the set of possible conferencing roles.

   However, it can also be the case that conflicts can occur given a
   hierarchy of elements.  In that case, the lower-level element
   privileges predominate over the upper-level privileges element.

3.7.4.2.  <conference-rules>

   The <conference-rules> element is a set of <entry> child elements
   with specific authorization rules that indicate who is allowed to
   subscribe to conference-information notifications, see floors,
   request/grant floors, and so on.

   Every <entry> element is represent by the 'id' attribute, each of
   which identifies a rule inside the conference.  It contains the
   <condition> and <actions> sub elements.

3.7.4.2.1.  <condition>

   The <condition> element determines whether a particular privilege
   applies to a user, a role, or domain.

   The <condition> element has the <identity> and the <validity> child
   element.  These elements MUST NOT appear more than once in the
   condition part of a single rule.

   The <identity> element restricts matching of a rule either to a
   single entity or a group of entities.  The <identity> element has the
   <one> and <many> child elements defined in Section 7.1 of [9].  The
   absence of the <identity> element in a <condition> element indicates
   that the privilege applies to all unauthenticated identities.

   The <identity> element has other child elements.  These child
   elements are <external-list>, <pseudonymous>, <has-been-referred>,
   <has-been-invited>, <has-been-in-conference>, <is-in-conference>,
   <administrator>, <is-on-dialout-list>, <is-on-refer-list>,
   <participant-passcode>, and <administrator-passcode>.

   The <validity> element expresses the validity period of the rule with
   a starting and an ending time.  The <validity> element and its child



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   elements ,<from> and <until>, are defined in section 7.3 of [9].

3.7.4.2.1.1.  <external-list>

   The <external-list> element can be used to match those participants
   that are part of a resource list that is created externally.  The
   <external-list> element contains a list of <except> elements and
   allows to implement a simple blacklist mechanism.  The <except>
   element contains an identity.

3.7.4.2.1.2.  <pseudonymous>

   The <pseudonymous> element is used to match participants that have
   provided an authenticated identity to the conference focus, but have
   requested pseudonymity in the conference itself.  A user requests
   pseudonymity by authenticating himself to the conference focus and
   providing a pseudonym in the signalling protocol (for example, using
   the From-header of a SIP request).

   The <pseudonymous> element can be combined with the <identity>
   element to provide the focus with a rule on what to do when a
   specific identity is authenticated and that identity is requesting
   pseudonymity through the signalling protocol.

3.7.4.2.1.3.  <has-been-referred>

   The <has-been-referred> element can be used to match those
   participants that the focus has referred to the conference.

3.7.4.2.1.4.  <has-been-invited>

   The <has-been-invited> element can be used to match those
   participants that the focus has invited into the conference.

3.7.4.2.1.5.  <has-been-in-conference>

   The <has-been-in-conference> element can be used to match those
   participants that have joined the conference in the past.

3.7.4.2.1.6.  <is-in-conference>

   The <is-in-conference> element can be used to match those
   participants that are currently participating in the conference.

3.7.4.2.1.7.  <administrator>

   The <administrator> element can be used to match those participants
   that are administrators of a conference.



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3.7.4.2.1.8.  <is-on-dialout-list>

   The <is-on-dialout-list> element can be used to match those
   participants that are on the dial-out list.

3.7.4.2.1.9.  <is-on-refer-list>

   The <is-on-refer-list> element can be used to match those
   participants that are on the refer list.

3.7.4.2.1.10.  <participant-passcode>

   The <participant-passcode> element can be used to match those
   participants that have knowledge of a passcode for the conference
   (PIN code).

   A focus need not care if a user using a passcode to join is calling
   from a PSTN or an IP phone.  For example: Using a SIP phone, a SIP
   INVITE request arrives directly at the focus.  The focus examines the
   identity and discovers that there are no rules allowing this identity
   to join.  The focus also determines that there are no rules
   explicitly prohibiting this identity from joining.  The focus in this
   case decides to challenge the identity for a passcode, if there is a
   rule that allows users with a passcode knowledge to join.  If no such
   rule exists, the focus would not challenge for a passcode.

   For PSTN users, the system can be set up for an IVR system to prompt
   the user for a passcode before forwarding the request to the focus.
   The focus does not need to care if there is an IVR system or not.  It
   can apply the same procedure as above.  It checks if there are any
   the rules allowing or denying the identity access.  In this case, the
   identity is the GW.  If no rules exist for that identity but a
   general passcode rule does, then the focus would challenge the GW/IVR
   for the passcode.

   A focus can challenge for the passcode using, for example, a HTTP
   Digest challenge.  The username, passcode and realm need to be
   assigned and distributed is a manner that is outside the scope of
   this document.  Mutliple passcodes can be assigned to multiple users.

3.7.4.2.1.11.  <administrators-passcode>

   In some cases, administrators of the conference are assigned a
   different passcode than normal participants.  The <administrator-
   passcode> element can be used to match those key participants that
   have knowledge on a key participant passcode for the conference.

   Again, a focus need not care if a user using a passcode to join is



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   calling from a PSTN or an IP phone.  It is important that the focus
   has a unique identity for each user joining from a PSTN phone via a
   gateway.  It is not enough that one identity to be assigned to all
   users joining from the same gateway since administrators have more
   control over conference duration.  It might be required that a
   gateway maps the telephone number of the PSTN phone into the IP
   signalling protocol header that usually carries the asserted identity
   or a user.

3.7.4.2.2.  <actions>

   The <actions> element in the applied rule is a positive grant of
   permission to the conference data model or the conferencing system.
   The <actions> element has the following operations:
   o  The <allow-refer-users-dynamically> element represents a boolean
      action.  If set to TRUE, the identity is allowed to instruct the
      focus to refer a user to the conference without modifying the
      refer-list (in SIP terms, the identity is allowed to send a REFER
      request to the focus which results in the focus sending a REFER
      request to the user the referrer wishes to join the conference).
      If set to FALSE, the refer request is rejected.  If this element
      is undefined it has a value of FALSE, causing the refer to be
      rejected.
   o  The <allow-invite-users-dynamically> element represents a boolean
      action.  If set to TRUE, the identity is allowed to instruct the
      focus to invite a user to the conference without modifying the
      dial-out list (in SIP terms, the identity is allowed to send a
      REFER request to the focus which results in the focus sending an
      INVITE request to the user the referrer wishes to join the
      conference).  If set to FALSE, the refer request is rejected.  If
      this element is undefined it has a value of FALSE, causing the
      refer to be rejected.
   o  The <allow-remove-users-dynamically> element represents a boolean
      action.  If set to TRUE, the identity is allowed to instruct the
      focus to remove a user from the conference without modifying the
      ruleset (in SIP terms, the identity is allowed to send a REFER
      request to the focus which results in the focus sending an BYE
      request to the user the referrer wishes to leave the conference).
      If set to FALSE, the refer request is rejected.  If this element
      is undefined it has a value of FALSE, causing the refer to be
      rejected.
   o  The <show-floor-holder> element defines the actions used by the
      conference focus to control floor requests.  This element defines
      the action that the focus is to take when processing a particular
      request to a floor within a conference.  This element has defined
      values of:





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      *  block: This action instructs the focus to deny the floor
         request.  This action is the default action taken in the
         absence of any other actions.
      *  confirm: This action instructs the focus to allow the request.
         The focus then uses the defined floor algorithm to further
         allow of deny the floor.  The algorithms used are outside the
         scope of this document.
   o  Note that placing a value of block for this element does not
      guarantee that a participant is blocked from joining the
      conference.  Any other rule that might resolve to true for this
      participant that carried an action whose value was higher than
      block would automatically grant confirm/allow permission to that
      participant.
   o  The <show-floor-requests> element is of type boolean
      transformation.  If set to TRUE, the conference participant is
      able to see the floor requests.  If set to FALSE, the conference
      participant is not able to see floor requests.  If this element is
      undefined, it has a value of FALSE, causing the floor requests to
      not being seen by the conference participant.
   o  A rule can be set that provides anonymity to a specific identity.
      In this case, the focus provides to the rest of the participants
      an anonymous identity for that user, for example anonymous1.  This
      can be achieved by using the <provide-anonymity> element.  It is a
      boolean transformation.  If set to TRUE, the conference
      participants will see an anonymous identity for the user whose
      identity is present in the conditions.
   o  The <read-write> element represents a boolean action.  If set to
      TRUE, the identity is allowed to modify the element described
      inside the 'element' attribute in the conference policy.  If set
      to FALSE, any modifications to the element are rejected.
   o  The <read-only> element represents a boolean action.  If set to
      TRUE, the identity is allowed to read the element described inside
      the 'element' attribute in the conference policy.  If set to
      FALSE, any attempts to read the element are rejected.

3.7.5.  <user>

   The element <user> describes a single participant in the conference.

   The following elements as well as the attributes of <user> are
   defined in [2], section 5.6: <display-text>, <associated-aors>,
   <roles>, <languages>, <cascaded-focus>, and <endpoint>.

   The <endpoint> element is under a <user> parent.  This element can
   provide the desired level of detail about the user's devices and
   signaling sessions taking part in the conference and has the
   following child elements defined in [2]: <display-text>, <referred>,
   <status>, <joining-method>, <joining-info>, <disconnection-method>,



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   <disconnection-info>, <media>, and <call-info>.

   The <provide-anonymity> provides anonymity to the user.  When a user
   is defined then the role must be defined or set to "participant" by
   default.  This specification does not define the set of possible
   conferencing roles nor the semantics associated with each.

   The <sphere> element can be used to indicate the state (e.g., 'work',
   'home', 'meeting', 'travel') the user is currently in.  It is defined
   in section 7.2 of [9].

   The <allow-refer-users-dynamically>, <allow-invite-users-dynamically>
   and <allow-remove-users-dynamically> elements are defined in the
   previous section.

   The <floors> element is a container of <entry> child elements, each
   describing a floor that joins this participant in the conference.
   The <entry> element has the <show-floor-holder> and the <show-floor-
   requests> child element.  The <entry> child elements is represent by
   the 'id' attribute, each of which identifies a floor inside the
   conference.

3.8.  <sidebars-by-ref>

   The <sidebars-by-ref> element contains a set of <entry> child
   elements.  Each <entry> child element contains a <user> child element
   with a sidebar conference unique identifier and a <display-text>
   child element.  The <sidebars-by-ref> element is described in Section
   5.9.1 of [2].

   Notice that the <sidebars-by-ref> child element does not include the
   attribute 'state' defined in [2].

3.9.  <sidebars-by-val>

   The <sidebars-by-val> element contains a set of <entry> child
   elements each containing information about a single sidebar.

   Notice as well that the <sidebars-by-val> and the <entry> child
   element do not include the attribute 'state' defined in [2].

3.10.  Template

   A Common Conference Information Data Model consist of a single
   template in accordance with the XCON framework document [1].
   Although the Common Conference Information Data Model defines two
   elements to hook a template (template-by-val, template-by-ref), a
   common conference document MUST only include one of these elements.



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3.10.1.  <template-by-val>

   The <template-by-val> element contains information about a single
   template.  The <template-by-val> likely makes sense for systems that
   just have a few options for media.

3.10.2.  <template-by-ref>

   The <template-by-ref> element contains a <urn> child element with a
   template conference URN and a <display-text> child element that
   contains descriptive text suitable for human consumption giving
   information about the template.  The <template-by-ref> make sense for
   systems offering many options for media.


4.  XML Schema

   In accordance with the XCON framework document [1], the Conference
   Object is a logical representation of a conference instance.  It is
   separated into two XML schemas, the common conference information
   schema and the conference template schema.  The common conference
   information schema contains core information that is utilized in any
   conference.  The conference template schema contains the variable
   information part of the Conference Object.  The document [10]
   supplies a set of core media templates that SHOULD be used in
   conjunction with this data model.  Notice that the <template-by-val>
   and the <template-by-ref> elements MUST NOT be defined together in
   the same common conference information schema.

   This specification makes use of XML namespaces for identifying common
   conference information documents and document fragments.  The
   namespace URI for elements defined by this specification is a URN:
   urn:ietf:params:xml:ns:common-conference-schema.


   <?xml version="1.0" encoding="UTF-8" ?>
    <xs:schema xmlns="urn:ietf:params:xml:ns:common-conference-schema"
      xmlns:info="urn:ietf:params:xml:ns:conference-info"
      xmlns:compol="urn:ietf:params:xml:ns:common-policy"
      xmlns:role="urn:ietf:params:xml:ns:role-schema"
      xmlns:xs="http://www.w3.org/2001/XMLSchema"
     targetNamespace="urn:ietf:params:xml:ns:common-conference-schema" elementFormDefault="qualified" attributeFormDefault="unqualified">
      <xs:import namespace="urn:ietf:params:xml:ns:conference-info" schemaLocation="C:\DOCUME~1\eoscdia\Desktop\conference-info.xsd" />
      <xs:import namespace="urn:ietf:params:xml:ns:common-policy" schemaLocation="C:\DOCUME~1\eoscdia\Desktop\common-policy.xsd" />
      <xs:import namespace="urn:ietf:params:xml:ns:role-schema" schemaLocation="C:\DOCUME~1\eoscdia\Desktop\role-schema.xsd" />

      <xs:import namespace="http://www.w3.org/XML/1998/namespace" schemaLocation="http://www.w3.org/2001/03/xml.xsd"/>
      <!--



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       CONFERENCE INFO
      -->
      <xs:element name="conference-info" type="conference-type"/>
      <!--
       CONFERENCE TYPE
      -->
      <xs:complexType name="conference-type">
         <xs:sequence>
           <xs:element name="conference-description" type="conference-description-type"/>
           <xs:element name="host-info" type="host-type"/>
           <xs:element name="conference-state" type="conference-state-type"/>
           <xs:element name="security-mechanism" type="security-mechanisms-type" minOccurs="0"/>
           <xs:element name="floor-information" type="floor-information-type" minOccurs="0"/>
           <xs:element name="users" type="users-type"/>
           <xs:element name="sidebars-by-ref" type="sidebars-by-ref-type" minOccurs="0"/>
           <xs:element name="sidebars-by-val" type="sidebars-by-val-type" minOccurs="0"/>
           <xs:element name="template-by-val" type="xs:string" minOccurs="0"/>
           <xs:element name="template-by-ref" type="template-by-ref-type" minOccurs="0"/>
           <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
         </xs:sequence>
      </xs:complexType>
      <!--
        CONFERENCE DESCRIPTION TYPE
      -->
      <xs:complexType name="conference-description-type">
         <xs:sequence>
           <xs:element name="display-text" type="xs:string" minOccurs="0"/>
           <xs:element name="subject" type="xs:string" minOccurs="0"/>
           <xs:element name="free-text" type="xs:string" minOccurs="0"/>
           <xs:element name="keywords" type="info:keywords-type" minOccurs="0"/>
           <xs:element name="webpage" type="xs:anyURI" minOccurs="0"/>
           <xs:element name="security-level" type="SecurityLevel" minOccurs="0"/>
           <xs:element name="allow-sidebars" type="xs:boolean" default="true" minOccurs="0"/>
           <xs:element name="conference-stage" type="conference-stage-type"/>
           <xs:element name="conference-time" type="conferencetime-type" minOccurs="0"/>
           <xs:element name="conf-uris" type="uris-type" minOccurs="0"/>
           <xs:element name="service-uris" type="uris-type" minOccurs="0"/>
           <xs:element name="maximum-user-count" type="maximum-user-count-type" minOccurs="0"/>
           <xs:element name="available-media" type="conference-media-type"/>
           <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
         </xs:sequence>
         <xs:anyAttribute namespace="##other" processContents="lax"/>
      </xs:complexType>
      <!--
        SECURITY LEVEL
      -->
      <xs:simpleType name="SecurityLevel">
         <xs:restriction base="xs:string">



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           <xs:enumeration value="none"/>
           <xs:enumeration value="low"/>
           <xs:enumeration value="medium"/>
           <xs:enumeration value="high"/>
         </xs:restriction>
      </xs:simpleType>
      <!--
        CONFERENCE STAGE
      -->
      <xs:simpleType name="conference-stage-type">
         <xs:restriction base="xs:string">
           <xs:enumeration value="reserved"/>
           <xs:enumeration value="started"/>
           <xs:enumeration value="running"/>
           <xs:enumeration value="ended"/>
         </xs:restriction>
      </xs:simpleType>
      <!--
        CONFERENCE TIME
      -->
      <xs:complexType name="conferencetime-type">
         <xs:sequence>
           <xs:element name="entry" minOccurs="0" maxOccurs="unbounded">
             <xs:complexType>
                <xs:sequence>
                   <xs:element name="base" type="xs:string"/>
                   <xs:element name="mixing-start-offset" type="xs:integer" minOccurs="0"/>
                   <xs:element name="mixing-stop-offset" type="xs:integer" minOccurs="0"/>
                   <xs:element name="can-join-after-offset" type="xs:integer" minOccurs="0"/>
                   <xs:element name="must-join-before-offset" type="xs:integer" minOccurs="0"/>
                   <xs:element name="request-users" type="xs:integer" minOccurs="0"/>
                   <xs:element name="notify-end-of-conference" type="xs:integer" minOccurs="0"/>
                   <xs:element name="allowed-extend-mixing-end-offset" type="xs:boolean" default="true" minOccurs="0"/>
                   <xs:any namespace="##other" processContents="lax" minOccurs="0"/>
                </xs:sequence>
             </xs:complexType>
           </xs:element>
         </xs:sequence>
        </xs:complexType>
        <!--
         URIS TYPE
        -->
        <xs:complexType name="uris-type">
           <xs:sequence>
              <xs:element name="SIP" type="uri-type" maxOccurs="unbounded"/>
              <xs:element name="H323" type="H323-type" maxOccurs="unbounded"/>
              <xs:element name="PSTN-ISDN" type="PSTN-type" maxOccurs="unbounded"/>
              <xs:element name="BFCP" type="BFCP-type" maxOccurs="unbounded"/>



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           </xs:sequence>
        </xs:complexType>
        <!--
          SIP TYPE
        -->
        <xs:complexType name="uri-type">
           <xs:sequence>
              <xs:element name="uri" type="xs:anyURI"/>
              <xs:element name="display-text" type="xs:string" minOccurs="0"/>
              <xs:element name="purpose" type="xs:string" minOccurs="0"/>
              <xs:element name="PIN-code" type="xs:integer" minOccurs="0"/>
              <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
           </xs:sequence>
           <xs:anyAttribute namespace="##other" processContents="lax"/>
        </xs:complexType>
        <!--
          H323 TYPE
        -->
        <xs:complexType name="H323-type">
           <xs:sequence>
              <xs:element name="H.323-alias" type="xs:string" minOccurs="0"/>
              <xs:element name="H.323-URI" type="xs:anyURI"/>
              <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
           </xs:sequence>
           <xs:anyAttribute namespace="##other" processContents="lax"/>
        </xs:complexType>
        <!--
           PSTN TYPE
        -->
        <xs:complexType name="PSTN-type">
           <xs:sequence>
              <xs:element name="phone-number" type="xs:unsignedInt" minOccurs="0"/>
              <xs:element name="rate" type="xs:unsignedInt" minOccurs="0"/>
           </xs:sequence>
           <xs:attribute name="PIN-code" type="xs:string" use="required"/>
           <xs:attribute name="purpose" type="xs:string"/>
        </xs:complexType>
        <!--
           BFCP TYPE
        -->
        <xs:complexType name="BFCP-type">
           <xs:sequence>
              <xs:element name="conference-id" type="xs:unsignedInt" minOccurs="0"/>
           </xs:sequence>
           <xs:anyAttribute namespace="##other" processContents="lax"/>
        </xs:complexType>
        <!--
           MAXIMUM USER TYPE



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        -->
        <xs:complexType name="maximum-user-count-type">
           <xs:sequence>
              <xs:element name="entry" type="xs:unsignedInt" minOccurs="0"/>
              <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
           </xs:sequence>
           <xs:attribute name="role" type="role:role-type" use="required"/>
           <xs:anyAttribute namespace="##other" processContents="lax"/>
        </xs:complexType>
        <!--
           CONFERENCE MEDIA TYPE
        -->
        <xs:complexType name="conference-media-type">
           <xs:sequence>
              <xs:element name="entry" type="conference-medium-type" maxOccurs="unbounded"/>
           </xs:sequence>
           <xs:attribute name="label" type="xs:string" use="required"/>
           <xs:anyAttribute namespace="##other" processContents="lax"/>
        </xs:complexType>
        <!--
           CONFERENCE MEDIUM TYPE
        -->
        <xs:complexType name="conference-medium-type">
           <xs:sequence>
              <xs:element name="type" type="xs:string"/>
              <xs:element name="display-text" type="xs:string" minOccurs="0"/>
              <xs:element name="status" type="info:media-status-type" minOccurs="0"/>
              <xs:element name="mixing-mode" type="mix-mode-type" minOccurs="0"/>
              <xs:element name="mix-level" type="xs:unsignedInt" minOccurs="0"/>
              <xs:element name="codecs" type="codecs-type" minOccurs="0"/>
           <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
           </xs:sequence>
           <xs:attribute name="label" type="xs:string" use="required"/>
           <xs:anyAttribute namespace="##other" processContents="lax"/>
        </xs:complexType>
        <!--
           MIX MODE TYPE
        -->
        <xs:simpleType name="mix-mode-type">
           <xs:restriction base="xs:string">
              <xs:enumeration value="Moderator-controlled"/>
              <xs:enumeration value="FCFS"/>
              <xs:enumeration value="Automatic"/>
           </xs:restriction>
        </xs:simpleType>
        <!--
           CODECS TYPE
        -->



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        <xs:complexType name="codecs-type">
           <xs:sequence>
              <xs:element name="entry" type="codec-type" maxOccurs="unbounded"/>
           </xs:sequence>
           <xs:attribute name="decision" type="decision-type" use="required"/>
           <xs:anyAttribute namespace="##other" processContents="lax"/>
        </xs:complexType>
        <!--
           CODEC TYPE
        -->
        <xs:complexType name="codec-type">
           <xs:attribute name="name" type="xs:string" use="required"/>
           <xs:attribute name="policy" type="policy-type" use="required"/>
           <xs:anyAttribute namespace="##other" processContents="lax"/>
        </xs:complexType>
        <!--
           DECISION TYPE
        -->
        <xs:simpleType name="decision-type">
           <xs:restriction base="xs:string">
              <xs:enumeration value="Automatic"/>
              <xs:enumeration value="Moderator-controlled"/>
           </xs:restriction>
        </xs:simpleType>
        <!--
           POLICY TYPE
        -->
        <xs:simpleType name="policy-type">
           <xs:restriction base="xs:string">
              <xs:enumeration value="Allowed"/>
              <xs:enumeration value="Disallowed"/>
           </xs:restriction>
        </xs:simpleType>
        <!--
           HOST TYPE
        -->
        <xs:complexType name="host-type">
           <xs:sequence>
              <xs:element name="display-text" type="xs:string" minOccurs="0"/>
              <xs:element name="web-page" type="xs:anyURI" minOccurs="0"/>
              <xs:element name="uris" type="uris-type" minOccurs="0"/>
              <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
           </xs:sequence>
           <xs:anyAttribute namespace="##other" processContents="lax"/>
         </xs:complexType>
        <!--
           CONFERENCE STATE TYPE
        -->



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        <xs:complexType name="conference-state-type">
           <xs:sequence>
              <xs:element name="allow-conference-state" type="xs:boolean" minOccurs="0"/>
              <xs:element name="user-count" type="xs:unsignedInt" minOccurs="0"/>
              <xs:element name="active" type="xs:boolean" minOccurs="0"/>
              <xs:element name="locked" type="xs:boolean" minOccurs="0"/>
              <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
              </xs:sequence>
           <xs:anyAttribute namespace="##other" processContents="lax"/>
        </xs:complexType>
        <!--
           SECURITY MECHANISMS TYPE
        -->
        <xs:complexType name="security-mechanisms-type">
           <xs:sequence>
               <xs:element name="entry-protocol" type="security-mechanism-type" maxOccurs="unbounded"/>
           </xs:sequence>
           <xs:anyAttribute namespace="##other" processContents="lax"/>
        </xs:complexType>
        <!--
           SECURITY MECHANISM TYPE
        -->
        <xs:complexType name="security-mechanism-type">
           <xs:sequence>
           <xs:element name="methods" type="methods-type" minOccurs="0"/>
              <xs:element name="option-tags" type="option-tags-type" minOccurs="0"/>
              <xs:element name="feature-tags" type="feature-tags-type" minOccurs="0"/>
              <xs:element name="bodies" type="bodies-type" minOccurs="0"/>
              <xs:element name="version" type="xs:unsignedInt" minOccurs="0"/>
              <xs:element name="supported" type="xs:boolean" minOccurs="0"/>
           <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
           </xs:sequence>
           <xs:attribute name="name" type="xs:string" use="required"/>
           <xs:anyAttribute namespace="##other" processContents="lax"/>
         </xs:complexType>
        <!--
           METHODS TYPE
        -->
        <xs:complexType name="methods-type">
           <xs:sequence>
              <xs:element name="method" type="codec-type" minOccurs="0"/>
              <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
           </xs:sequence>
           <xs:attribute name="default-policy" type="policy-type" use="required"/>
           <xs:anyAttribute namespace="##other" processContents="lax"/>
        </xs:complexType>
        <!--
           OPTION TAGS TYPE



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        -->
        <xs:complexType name="option-tags-type">
           <xs:sequence>
              <xs:element name="option-tag" type="codec-type" minOccurs="0"/>
              <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
           </xs:sequence>
           <xs:attribute name="default-policy" type="default-policy-type" use="required"/>
           <xs:anyAttribute namespace="##other" processContents="lax"/>
        </xs:complexType>
        <!--
           DEFAULT POLICY TYPE
        -->
        <xs:simpleType name="default-policy-type">
           <xs:restriction base="xs:string">
              <xs:enumeration value="Allowed"/>
              <xs:enumeration value="Disallowed"/>
              <xs:enumeration value="Mandatory"/>
           </xs:restriction>
        </xs:simpleType>
        <!--
           FEATURE TAGS TYPE
        -->
        <xs:complexType name="feature-tags-type">
           <xs:sequence>
              <xs:element name="feature-tag" type="codec-type" minOccurs="0"/>
              <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
           </xs:sequence>
           <xs:attribute name="default-policy" type="policy-type" use="required"/>
           <xs:anyAttribute namespace="##other" processContents="lax"/>
        </xs:complexType>
        <!--
           BODIES TYPE
        -->
        <xs:complexType name="bodies-type">
           <xs:sequence>
              <xs:element name="body-disposition" type="body-type" minOccurs="0"/>
              <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
           </xs:sequence>
           <xs:attribute name="default-policy" type="policy-type" use="required"/>
           <xs:attribute name="default-encryption" type="policy-type" use="required"/>
           <xs:anyAttribute namespace="##other" processContents="lax"/>
        </xs:complexType>
        <!--
           BODY TYPE
        -->
        <xs:complexType name="body-type">
           <xs:sequence>
              <xs:element name="body-format" type="codec-type" minOccurs="0"/>



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              <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
           </xs:sequence>
           <xs:attribute name="name" type="xs:string" use="required"/>
           <xs:attribute name="policy" type="policy-type" use="required"/>
           <xs:attribute name="default-policy" type="policy-type" use="required"/>
           <xs:attribute name="encryption" type="policy-type" use="required"/>
           <xs:anyAttribute namespace="##other" processContents="lax"/>
        </xs:complexType>
        <!--
           FLOOR INFORMATION TYPE
        -->
        <xs:complexType name="floor-information-type">
           <xs:sequence>
              <xs:element name="allow-floor-events" type="xs:boolean" maxOccurs="unbounded"/>
              <xs:element name="floor-request-handling" type="floor-request-type" maxOccurs="unbounded"/>
              <xs:element name="conference-floor-policy" type="Conference-floor-policy" maxOccurs="unbounded"/>
              <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
           </xs:sequence>
           <xs:anyAttribute namespace="##other" processContents="lax"/>
        </xs:complexType>
        <!--
           FLOOR REQUEST TYPE
        -->
        <xs:simpleType name="floor-request-type">
           <xs:restriction base="xs:string">
              <xs:enumeration value="block"/>
              <xs:enumeration value="confirm"/>
           </xs:restriction>
        </xs:simpleType>
        <!--
           CONFERENCE FLOOR POLICY
        -->
        <xs:complexType name="Conference-floor-policy">
           <xs:sequence>
              <xs:element name="Floor" maxOccurs="unbounded">
                 <xs:complexType>
                    <xs:sequence>
                       <xs:element name="Media-types">
                          <xs:complexType>
                             <xs:sequence>
                                <xs:element name="Video" minOccurs="0"/>
                                <xs:element name="Audio" minOccurs="0"/>
                                <xs:element name="Application" minOccurs="0"/>
                                <xs:element name="Data" minOccurs="0"/>
                                <xs:element name="Control" minOccurs="0"/>
                                <xs:element name="Message" minOccurs="0"/>
                                <xs:element name="Text" minOccurs="0"/>
                                <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>



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                             </xs:sequence>
                          </xs:complexType>
                       </xs:element>
                    <xs:element name="Algorithm">
                       <xs:complexType>
                          <xs:sequence>
                             <xs:element name="Moderator-controlled" minOccurs="0"/>
                             <xs:element name="FCFS" minOccurs="0"/>
                             <xs:element name="Random" minOccurs="0"/>
                             <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
                          </xs:sequence>
                       </xs:complexType>
                    </xs:element>
                    <xs:element name="Max-floor-users" type="xs:nonNegativeInteger" minOccurs="0"/>
                    <xs:element name="Moderator-URI" type="xs:anyURI" minOccurs="0"/>
                 </xs:sequence>
                 <xs:attribute name="moderator-controlled" type="xs:boolean" default="false"/>
                 <xs:attribute name="label" type="xs:string" use="required"/>
                 </xs:complexType>
              </xs:element>
           </xs:sequence>
        </xs:complexType>
        <!--
           USERS TYPE
        -->
        <xs:complexType name="users-type">
           <xs:sequence>
              <xs:element name="join-handling" type="join-handling-type" minOccurs="0"/>
              <xs:element name="user-admission-policy" type="user-admission-policy-type"/>
              <xs:element name="user-must-be-specified" type="xs:boolean" minOccurs="0"/>
              <xs:element name="dial-in-list" type="UserList" minOccurs="0"/>
              <xs:element name="dial-out-list" type="UserList" minOccurs="0"/>
              <xs:element name="refer-list" type="UserList" minOccurs="0"/>
              <xs:element name="privileges-control-list" type="privileges-control-list-type" minOccurs="0"/>
              <xs:element name="user" type="user-type" minOccurs="0"/>
              <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
           </xs:sequence>
           <xs:anyAttribute namespace="##other" processContents="lax"/>
        </xs:complexType>
        <!--
           USERS ADMISSION POLICY
        -->
        <xs:simpleType name="user-admission-policy-type">
           <xs:restriction base="xs:string">
              <xs:enumeration value="closedAuthenticated"/>
              <xs:enumeration value="openAuthenticated"/>
              <xs:enumeration value="anonymous"/>
           </xs:restriction>



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        </xs:simpleType>
        <!--
           JOIN HANDLING TYPE
        -->
        <xs:simpleType name="join-handling-type">
           <xs:restriction base="xs:string">
              <xs:enumeration value="block"/>
              <xs:enumeration value="allow"/>
              <xs:enumeration value="confirm"/>
              <xs:enumeration value="IVR"/>
              <xs:enumeration value="directed-operator"/>
           </xs:restriction>
         </xs:simpleType>
         <!--
           USERLIST
         -->
         <xs:complexType name="UserList">
           <xs:sequence>
              <xs:element name="target" type="Target" minOccurs="0" maxOccurs="unbounded"/>
              <xs:element name="external" type="Target" minOccurs="0" maxOccurs="unbounded"/>
           </xs:sequence>
         </xs:complexType>
         <!--
           TARGET
         -->
          <xs:complexType name="Target">
           <xs:complexContent>
              <xs:restriction base="xs:anyType">
                 <xs:sequence>
                     <xs:any namespace="##any" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
                 </xs:sequence>
                 <xs:attribute name="uri" type="xs:anyURI" use="required"/>
               </xs:restriction>
           </xs:complexContent>
         </xs:complexType>
         <!--
          PRIVILEGES CONTROL LIST TYPE
         -->
         <xs:complexType name="privileges-control-list-type">
           <xs:sequence>
              <xs:element name="data-access-rights" type="data-access-rights-type" maxOccurs="unbounded"/>
              <xs:element name="conference-rules" type="conference-rules-type" maxOccurs="unbounded"/>
           </xs:sequence>
           <xs:anyAttribute namespace="##other" processContents="lax"/>
         </xs:complexType>
         <!--
           DATA ACCESS RIGHTS TYPE
         -->



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         <xs:complexType name="data-access-rights-type">
           <xs:sequence>
              <xs:element name="entry" type="entry-rights-type" maxOccurs="unbounded"/>
           </xs:sequence>
           <xs:anyAttribute namespace="##other" processContents="lax"/>
         </xs:complexType>
        <!--
           ENTRY RIGHTS TYPE
        -->
        <xs:complexType name="entry-rights-type">
           <xs:attribute name="name" type="xs:string" use="required"/>
           <xs:attribute name="read-only" type="role:role-type" use="required"/>
           <xs:attribute name="read-write" type="role:role-type" use="required"/>
           <xs:anyAttribute namespace="##other" processContents="lax"/>
        </xs:complexType>
        <!--
           CONFERENCE RULES TYPE
        -->
        <xs:complexType name="conference-rules-type">
           <xs:sequence>
              <xs:element name="entry" type="conference-rule-type" maxOccurs="unbounded"/>
           </xs:sequence>
           <xs:attribute name="id" type="xs:string" use="required"/>
           <xs:anyAttribute namespace="##other" processContents="lax"/>
        </xs:complexType>
        <!--
           CONFERENCE RULE TYPE
        -->
        <xs:complexType name="conference-rule-type">
           <xs:sequence>
              <xs:element name="condition" type="condition-type" maxOccurs="unbounded"/>
              <xs:element name="action" type="action-type" maxOccurs="unbounded"/>
           </xs:sequence>
           <xs:anyAttribute namespace="##other" processContents="lax"/>
        </xs:complexType>
        <!--
           CONDITION TYPE
        -->
        <xs:complexType name="condition-type">
           <xs:sequence>
              <xs:element name="identity" type="identity-type"/>
              <xs:element name="validity" type="compol:validityType"/>
           </xs:sequence>
           <xs:anyAttribute namespace="##other" processContents="lax"/>
        </xs:complexType>
        <!--
           IDENTITY TYPE
        -->



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        <xs:complexType name="identity-type">
           <xs:sequence>
              <xs:element name="identity" type="identityType" maxOccurs="unbounded"/>
              <xs:element name="validity" type="compol:validityType" maxOccurs="unbounded"/>
           </xs:sequence>
           <xs:anyAttribute namespace="##other" processContents="lax"/>
        </xs:complexType>
        <!--
           ROLES IDENTITY TYPE
        -->
        <xs:complexType name="identityType">
           <xs:complexContent>
              <xs:restriction base="xs:anyType">
                 <xs:choice minOccurs="0">
                    <xs:element name="one" type="compol:oneType"/>
                    <xs:element name="many" type="compol:manyType"/>
                    <xs:element name="external-list" type="xs:string"/>
                    <xs:element name="pseudonymous" type="xs:string"/>
                    <xs:element name="has-been-referred" type="xs:string"/>
                    <xs:element name="has-been-invited" type="xs:string"/>
                    <xs:element name="has-been-in-conference" type="xs:string"/>
                    <xs:element name="is-in-conference" type="xs:string"/>
                    <xs:element name="administrator" type="xs:string"/>
                    <xs:element name="is-on-dialout-list" type="xs:string"/>
                    <xs:element name="is-on-refer-list" type="xs:string"/>
                    <xs:element name="participant-passcode" type="xs:string"/>
                    <xs:element name="administrator-passcode" type="xs:string"/>
                 </xs:choice>
              </xs:restriction>
           </xs:complexContent>
        </xs:complexType>
        <!--
           ACTION TYPE
        -->
        <xs:complexType name="action-type">
           <xs:complexContent>
              <xs:restriction base="xs:anyType">
                 <xs:choice minOccurs="0" maxOccurs="unbounded">
                   <xs:element name="allow-refer-users-dynamically" type="xs:boolean"/>
                   <xs:element name="allow-invite-users-dynamically" type="xs:boolean"/>
                   <xs:element name="allow-remove-users-dynamically" type="xs:boolean"/>
                   <xs:element name="show-floor-holder" type="floor-request-type"/>
                   <xs:element name="show-floor-request" type="xs:boolean"/>
                   <xs:element name="provide-anonymity" type="xs:boolean"/>
                   <xs:element name="read-only" type="role:role-type"/>
                   <xs:element name="read-write" type="role:role-type"/>
                 </xs:choice>
              </xs:restriction>



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           </xs:complexContent>
         </xs:complexType>
        <!--
           USER TYPE
        -->
        <xs:complexType name="user-type">
           <xs:sequence>
              <xs:element name="user" type="one-user-type" minOccurs="0" maxOccurs="unbounded"/>
              <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
           </xs:sequence>
           <xs:attribute name="state" type="info:state-type" use="optional" default="full"/>
           <xs:anyAttribute namespace="##other" processContents="lax"/>
        </xs:complexType>
        <!--
           ONE USER TYPE
        -->
        <xs:complexType name="one-user-type">
           <xs:sequence>
              <xs:element name="display-text" type="xs:string" minOccurs="0"/>
              <xs:element name="associated-aors" type="info:uris-type" minOccurs="0"/>
              <xs:element name="provide-anonymity" type="xs:boolean" minOccurs="0"/>
              <xs:element name="roles" type="role:role-type" minOccurs="0"/>
              <xs:element name="languages" type="info:user-languages-type" minOccurs="0"/>
              <xs:element name="cascaded-focus" type="xs:anyURI" minOccurs="0"/>
              <xs:element name="sphere" type="compol:sphereType" minOccurs="0"/>
              <xs:element name="allow-refer-users-dynamically" type="xs:boolean"/>
              <xs:element name="allow-invite-users-dynamically" type="xs:boolean"/>
              <xs:element name="allow-remove-users-dynamically" type="xs:boolean"/>
              <xs:element name="floors" type="show-floors-type"/>
              <xs:element name="endpoint" type="info:endpoint-type" minOccurs="0" maxOccurs="unbounded"/>
              <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
           </xs:sequence>
           <xs:attribute name="entity" type="xs:anyURI"/>
           <xs:attribute name="state" type="info:state-type" use="optional" default="full"/>
           <xs:anyAttribute namespace="##other" processContents="lax"/>
        </xs:complexType>
        <!--
           SHOW FLOORS TYPE
        -->
        <xs:complexType name="show-floors-type">
           <xs:sequence>
              <xs:element name="entry" type="show-floor-type" maxOccurs="unbounded"/>
           </xs:sequence>
           <xs:anyAttribute namespace="##other" processContents="lax"/>
        </xs:complexType>
        <!--
           SHOW FLOOR TYPE
        -->



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        <xs:complexType name="show-floor-type">
           <xs:sequence>
              <xs:element name="show-floor-holder" type="xs:boolean" minOccurs="0"/>
              <xs:element name="show-floor-request" type="xs:boolean"/>
              <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
           </xs:sequence>
           <xs:attribute name="id" type="xs:string" use="required"/>
           <xs:anyAttribute namespace="##other" processContents="lax"/>
        </xs:complexType>
        <!--
           SIDEBARS-BY-REF TYPE
        -->
        <xs:complexType name="sidebars-by-ref-type">
           <xs:sequence>
              <xs:element name="entry" type="info:uri-type" maxOccurs="unbounded"/>
           </xs:sequence>
           <xs:anyAttribute namespace="##other" processContents="lax"/>
        </xs:complexType>
        <!--
           SIDEBARS-BY-VAL TYPE
        -->
        <xs:complexType name="sidebars-by-val-type">
           <xs:sequence>
              <xs:element name="entry" type="conference-type" minOccurs="0" maxOccurs="unbounded"/>
           </xs:sequence>
           <xs:anyAttribute namespace="##other" processContents="lax"/>
        </xs:complexType>
        <!--
           TEMPLATE-BY-REF TYPE
        -->
        <xs:complexType name="template-by-ref-type">
           <xs:sequence>
              <xs:element name="urn" type="xs:string"/>
              <xs:element name="display-text" type="xs:string"/>
           </xs:sequence>
           <xs:anyAttribute namespace="##other" processContents="lax"/>
        </xs:complexType>
   </xs:schema>



5.  XML Schema Extensibility

   The Common Conference Information Data Model defined in this document
   is meant to be extensible toward specific application domains.  Such
   an extension is accomplished by defining elements, child elements and
   attributes that are specific to the desired application domain.  Each
   extension MUST define its own namespace.  Points of extension MUST be



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   defined in the schema, and SHOULD be done using the <any
   namespace="##other"> construct.

   Elements or attributes from unknown namespaces MUST be ignored.

   The common conference information schema as is defined in [1] MUST
   include an extension point to allow new templates to hook into the
   schema and SHOULD be done using the <any namespace="##other">
   construct.


6.  XML example

   The following is an example of a common conference information
   document.  The conference starts on October 17, 2006, at 10:30 AM in
   New York City and finishes the same day at 12:30 PM every week.  In
   this example, there are currently 3 participants in a conference, one
   administrator, one moderator, and one participant.  Note that
   sidebars are allowed in this conference and there is one sidebar in
   the conference.  Also note that there is one floor moderator for the
   audio and a different floor moderator for the video.


   <?xml version="1.0" encoding="UTF-8"?>
      <conference-info
       xmlns="urn:ietf:params:xml:ns:common-conference-schema"
       xmlns:info="urn:ietf:params:xml:ns:conference-info"
       xmlns:sesspol="urn:ietf:params:xml:ns:sessionpolicy"
       xmlns:compol="urn:ietf:params:xml:ns:common-policy"
       entity="sips:conference@example.com">
      <!--
        CONFERENCE DESCRIPTION
      -->
       <info:conference-description xml:lang="en-us">
        <info:display-text>Discussion of the best moments in Formula-1\\
   racing</info:display-text>
        <info:subject> Sports:Formula-1</info:subject>
        <info:free-text>This is a conference example</info:free-text>
        <info:keywords>Formula-1, cars</info:keywords>
        <web-page>http://www.example.com/users/alice/formula-1\\
   </web-page>
        <security-level>low</security-level>
        <allow-sidebars>true</allow-sidebars>
        <conference-stage>running</conference-stage>
       <!--
        CONFERENCE TIME
        -->
        <conference-time>



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         <entry>
          <base>
              BEGIN:VCALENDAR
              PRODID:-//LlamaSpinner Inc.//NONSGML CamelCall//EN
              VERSION:2.0
              BEGIN:VEVENT
              DTSTAMP:20051103T140728Z
              UID:carol at example.com
              ORGANIZER:MAILTO:carol at example.com
              DTSTART:20061017T143000Z
              RRULE:FREQ=WEEKLY
              DTEND:20061017T163000Z
          </base>
          <mixing-start-offset required-participant="moderator">
          20061017T142900Z</mixing-start-offset>
          <mixing-end-offset required-participant="participant">
           20061017T163100Z</mixing-end-offset>
          <must-join-before-offset>
           20061017T15300Z</must-join-before-offset>
         </entry>
        </conference-time>
        <!--
        CONFERENCE UNIQUE IDENTIFIERS
        -->
        <info:conf-uris>
         <info:SIP>
          <info:uri>tel:+3585671234</info:uri>
          <info:display-text>Conference Bridge</info:display-text>
          <info:purpose>participation</info:purpose>
         </info:SIP>
         <info:SIP>
          <info:uri>http://www.example.com/54634/live.ram</info:uri>
          <info:purpose>streaming</info:purpose>
         </info:SIP>
        </info:conf-uris>
        <!--
          SERVICE URIS
        -->
        <info:service-uris>
         <info:SIP>
          <info:uri>http://www.example.com/formula1/</info:uri>
          <info:purpose>web-page</info:purpose>
         </info:SIP>
        </info:service-uris>
        <!--
          MAXIMUM USER COUNT
        -->
        <maximum-user-count>



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         <entry role = "administrator">2</entry>
         <entry role = "moderator">5</entry>
         <entry role = "participant">150</entry>
        </maximum-user-count>
        <!--
          AVAILABLE MEDIA
        -->
        <info:available-media>
         <info:entry label="10234">
          <info:display-text>main audio</info:display-text>
          <info:type>audio</info:type>
          <info:status>sendrecv</info:status>
          <mixing-mode>automatic</mixing-mode>
          <mix level>3</mix level>
          <codecs decision="automatic">
           <codec name="PCMU" policy="allowed"/>
          </codecs>
         </info:entry>
         <info:entry label="10235">
          <info:display-text>main video</info:display-text>
          <info:type>video</info:type>
          <mixing-mode>automatic</mixing-mode>
          <mix level>4</mix level>
          <info:status>sendrecv</info:status>
          <sesspol:codecs decision="automatic">
           <sesspol:codec name="H.263" policy="allowed"/>
          </sesspol:codecs>
         </info:entry>
        </info:available-media>
       </info:conference-description>
      <!--
        HOST INFO
      -->
       <info:host-info>
        <info:display-text>Formula1</info:display-text>
        <info:web-page>http://www.example.com/users/formula-1/\\
   </info:web-page>
        <info:uris>
         <info:SIP>
          <info:uri>sip:alice@example.com</info:uri>
         </info:SIP>
         <info:SIP>
          <info:uri>sip:carol@example.com</info:uri>
         </info:SIP>
        </info:uris>
       </info:host-info>
      <!--
        CONFERENCE STATE



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      -->
       <info:conference-state>
        <allow-conference-state>true \\
   </allow-conference-state>
        <info:user-count>3</info:user-count>
        <info:active>true</info:active>
        <info:locked>false</info:locked>
       </info:conference-state>
      <!--
        SECURITY MECHANISM
      -->
       <security-mechanism>
        <entry-protocol name="SIP">
         <sesspol:methods default-policy="allowed">
          <sesspol:method name="MESSAGE" policy="disallowed"/>
         </sesspol:methods>
          <sesspol:option-tags default-policy="disallowed">
           <sesspol:option-tag name="100rel" policy="mandatory"/>
           <sesspol:option-tag name="preconditions" policy="allowed"/>
          </sesspol:option-tags>
          <sesspol:feature-tags default-policy="disallowed">
           <sesspol:feature-tag name="video" policy="allowed"/>
          </sesspol:feature-tags>
          <sesspol:bodies default-policy="allowed" \\
   default-encryption="allowed">
           <sesspol:body-disposition name="session" policy="allowed" \\
   encryption="disallowed" default-policy="disallowed">
            <sesspol:body-format name="application/sdp" \\
   policy="allowed"/>
          </sesspol:body-disposition>
          </sesspol:bodies>
        </entry-protocol>
      </security-mechanism>
      <!--
        FLOOR INFORMATION
      -->
      <floor-information>
      <allow-floor-events>true</allow-floor-events>
      <floor-request-handling>1 </floor-request-handling>
      <conference-floor-policy>
       <floor moderator-controlled="true" label="10234">
        <media-types>audio</media-types>
        <algorithm>Moderator-controlled</algorithm>
        <max-floor-users>1</max-floor-users>
        <moderator-uri>sip:alice@example.com \\
   </moderator-uri>
       </floor>
       <floor moderator-controlled="true" label="10235">



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        <media-types>video</media-types>
        <algorithm>Moderator-controlled</algorithm>
        <max-floor-users>1</max-floor-users>
        <moderator-uri>sip:carol@example.com \\
   </moderator-uri>
       </floor>
      </conference-floor-policy>
     </floor-information>
      <!--
        USERS
      -->
       <users>
        <join-handling>allow</join-handling>
        <!--
         DIAL OUT LIST
        -->
        <dial-out-list>
         <target uri="sip:bob@example.com"/>
         <target uri="sip:alice@example.com"/>
         <target uri="sip:carol@example.com"/>
        </dial-out-list>
        <!--
          REFER LIST
        -->
        <refer-list>
         <target uri="sip:john@example.com"/>
        </refer-list>
        <!--
          PRIVILEGES CONTROL LIST
        -->
        <privileges-control-list>
         <data-access-rights>
          <conference-description read-only= "observer"/>
          <security-level read-only= "administrator"/>
          <allow-sidebars read-only= "creator" \\
   read-write= "creator"/>
          <conference-time read-only= "administrator"/>
          <maximum-user-count read-write= "creator"/>
          <codecs read-only= "creator" read-write= "creator"/>
          <host-info read-write= "creator"/>
          <conference-state read-write= "creator"/>
          <security-mechanism read-only= "creator"/>
          <floor-information read-only= "administrator"/>
          <dial-out-list read-only= "administrator"/>
          <refer-list read-only= "administrator"/>
          <privileges-control-list read-only= "creator"/>
          <conditions read-only= "creator"/>
          <validity read-only= "creator"/>



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          <allow-conference-state read-only= "observer"/>
          <sidebars-by-ref read-only= "observer"\\
   read-write= "creator"/>
          <sidebars-by-val read-only= "observer"\\
   read-write= "creator"/>
         </data-access-rights>
         <conference-rules>
          <entry id="1">
           <conditions>
            <compol:identity>
             <compol:domain>example.com</compol:domain>
            </compol:identity>
            <compol:validity>
             <compol:from>20061017T143000Z</compol:from>
             <compol:to>20061017T163000Z</compol:to>
            </compol:validity>
           </conditions>
           <compol:actions>
            <compol:allow-conference-state>true\\
   </compol:allow-conference-state>
           </compol:actions>
          </entry>
          <entry id="2">
           <conditions>
            <compol:identity>
             <compol:uri>bob@example.com</compol:uri>
            </compol:identity>
           </conditions>
           <compol:actions>
            <join-handling>block</join-handling>
           </compol:actions>
          </entry>
         </conference-rules>
        </privileges-control-list>
        <!--
          USER
        -->
        <info:user entity="sip:bob@example.com">
         <info:display-text>Bob Hoskins</display-text>
         <info:associated-aors>
          <info:entry>
           <info:uri>mailto:bob@example.com</info:uri>
           <info:display-text>email</info:display-text>
          </info:entry>
         </info:associated-aors>
         <provide-anonymity>false</provide-anonymity>
         <info:roles>
          <info:entry>participant</info:entry>



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         </info:roles>
         <info:languages>en</info:languages>
         <sphere value="work"/>
         <allow-refer-users-dynamically>false\\
   </allow-refer-users-dynamically>
         <allow-invite-users-dynamically>false\\
   </allow-invite-users-dynamically>
         <allow-remove-users-dynamically>false\\
   </allow-remove-users-dynamically>
         <floors>
          <entry id="1">
           <show-floor-holder>false</show-floor-holder>
           <show-floor-requests>false \\
   </show-floor-requests>
          </entry>
          </floors>
         <!--
          ENDPOINTS
         -->
         <info:endpoint entity="sip:bob@example.com">
          <info:display-text>Bob's Laptop</info:display-text>
          <info:referred>
           <info:when>20061017T140000Z</info:when>
           <info:reason>expert required</info:reason>
           <info:by>sip:alice@example.com</info:by>
          </info:referred>
          <info:status>connected</info:status>
          <info:joining-method>dialed-out</info:joining-method>
          <info:joining-info>
           <info:when>20061017T140000Z</info:when>
           <info:reason>invitation</info:reason>
           <info:by>sip:alice@example.com</info:by>
          </info:joining-info>
          <!--
           MEDIA
          -->
          <info:media id="1">
           <info:label>10235</info:label>
           <info:src-id>432424</info:src-id>
          </info:media>
          <!--
            CALL INFO
          -->
          <info:call-info>
           <info:sip>
            <info:display-text>full info</info:display-text>
            <info:call-id>hsjh8980vhsb78</info:call-id>
            <info:from-tag>vav738dvbs</info:from-tag>



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            <info:to-tag>8954jgjg8432</info:to-tag>
           </info:sip>
          </info:call-info>
         </info:endpoint>
        </info:user>
        <!--
          USER
        -->
        <info:user entity="sip:alice@example.com">
         <info:display-text>Alice Kay</info:display-text>
         <info:associated-aors>
          <info:entry>
           <info:uri>mailto:alice@example.com</info:uri>
           <info:display-text>email</info:display-text>
          </info:entry>
         </info:associated-aors>
         <provide-anonymity>false</provide-anonymity>
         <info:roles>
          <info:entry>moderator</info:entry>
         </info:roles>
         <info:languages>en</info:languages>
         <sphere value="work"/>
         <allow-refer-users-dynamically>true\\
   </allow-refer-users-dynamically>
         <allow-invite-users-dynamically>true\\
   </allow-invite-users-dynamically>
         <allow-remove-users-dynamically>true\\
   </allow-remove-users-dynamically>
         <!--
          ENDPOINTS
         -->
         <info:endpoint entity="sip:alice@example.com">
          <info:display-text>Alice's Desktop</info:display-text>
          <info:status>connected</info:status>
          <info:joining-method>dialed-in</info:joining-method>
          <info:joining-info>
           <info:when>20061017T133508Z</info:when>
           <info:reason>invitation</info:reason>
           <info:by>sip:conference@example.com</info:by>
          </info:joining-info>
          <!--
           MEDIA
          -->
          <info:media id="1">
           <info:label>10235</info:label>
           <info:src-id>432424</info:src-id>
           <info:status>sendrecv</info:status>
          </info:media>



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          <info:media id="2">
           <info:label>10234</info:label>
           <info:src-id>532535</info:src-id>
           <info:status>sendrecv</info:status>
          </info:media>
          <!--
            CALL INFO
          -->
          <info:call-info>
           <info:sip>
            <info:display-text>full info</info:display-text>
            <info:call-id>truy45469123478</info:call-id>
            <info:from-tag>asd456cbgt</info:from-tag>
            <info:to-tag>3456jgjg1234</info:to-tag>
           </info:sip>
          </info:call-info>
         </info:endpoint>
        </info:user>
        <!--
          USER
        -->
        <info:user entity="sip:carol@example.com">
         <info:display-text>Carol More</info:display-text>
         <info:associated-aors>
          <info:entry>
           <info:uri>mailto:carol@example.com</info:uri>
           <info:display-text>email</info:display-text>
          </info:entry>
         </info:associated-aors>
         <provide-anonymity>false</provide-anonymity>
         <info:roles>
          </info:entry>administrator</info:entry>
         </info:roles>
         <info:languages>en</info:languages>
         <sphere value="work"/>
         <allow-refer-users-dynamically>true\\
   </allow-refer-users-dynamically>
         <allow-invite-users-dynamically>true\\
   </allow-invite-users-dynamically>
         <allow-remove-users-dynamically>true\\
   </allow-remove-users-dynamically>
         <!--
          ENDPOINTS
         -->
         <info:endpoint entity="sip:carol@example.com">
          <info:display-text>Carol's Computer</info:display-text>
          <info:status>connected</info:status>
          <info:joining-method>dialed-in</info:joining-method>



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          <info:joining-info>
           <info:when>20061017T133005Z</info:when>
           <info:reason>invitation</info:reason>
           <info:by>sip:conference@example.com</info:by>
          </info:joining-info>
          <!--
           MEDIA
          -->
          <info:media id="1">
           <info:label>10235</info:label>
           <info:src-id>432424</info:src-id>
           <info:status>sendrecv</info:status>
          </info:media>
          <info:media id="2">
           <info:label>10234</info:label>
           <info:src-id>532535</info:src-id>
           <info:status>sendrecv</info:status>
          </info:media>
          <!--
            CALL INFO
          -->
          <info:call-info>
           <info:sip>
            <info:display-text>full info</info:display-text>
            <info:call-id>wevb12562321894</info:call-id>
            <info:from-tag>asw456wedf</info:from-tag>
            <info:to-tag>2365dfrt3497</info:to-tag>
           </info:sip>
          </info:call-info>
         </info:endpoint>
        </info:user>
       </users>
       <!--
         SIDEBARS BY REFERENCE
       -->
       <info:sidebars-by-ref>
        <info:entry>
         <info:uri>sips:conference@example.com;grid=40</info:uri>
         <info:display-text>private with Bob</info:display-text>
        </info:entry>
       </info:sidebars-by-ref>
       <!--
         SIDEBARS BY VALUE
       -->
       <info:sidebars-by-val>
        <info:entry entity="sips:conference@example.com;grid=40">
         <info:users>
          <info:user entity="sip:bob@example.com"/>



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          <info:user entity="sip:carol@example.com"/>
         </info:users>
        </info:entry>
       </info:sidebars-by-val>
      </info:conference-info>



   Note that due to RFC formatting conventions, this documents splits
   lines whose content would exceed 72 characters.  Two backslash
   characters mark where the lines folding has taken place.  These
   backslash would not appear in the actual XML data model.


7.  Security Considerations

   A malicious user can manipulate parts of the Conference Information
   Data Model privileges document giving themselves and others
   privileges to manipulate the data model.  It is very important that
   only authorized clients are able to manipulate the Conference
   Information Data Model document.  Any conference control protocol
   MUST provide authentication, confidentiality and integrity.


8.  IANA Considerations


9.  Acknowledgements

   This document is really a distillation of many ideas discussed over a
   long period of time.  These ideas were contributed by many different
   drafts in the XCON working group and the SIPPING working group.  I
   would like to thanks Orit Levin, Adam Roach, Mary Barnes, Chris
   Boulton, Umesh Chandra, Orit Levin, and Jari Urpilainen for their
   comments.  Also, I would like to thanks Hisham Khartabil, Petri
   Koskelainen, and Aki Niemi to let us use the policy information of
   their cpcp drafts in this document.


10.  References

10.1.  Normative References

   [1]  Barnes, M. and C. Boulton, "A Framework and Data Model for
        Centralized Conferencing", draft-barnes-xcon-framework-02 (work
        in progress), February 2005.

   [2]  Rosenberg, J., "A Session Initiation Protocol (SIP) Event



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        Package for Conference State",
        draft-ietf-sipping-conference-package-12 (work in progress),
        July 2005.

   [3]  Bradner, S., "Key words for use in RFCs to Indicate Requirement
        Levels", BCP 14, RFC 2119, March 1997.

   [4]  Rosenberg, J., "A Framework for Conferencing with the Session
        Initiation Protocol",
        draft-ietf-sipping-conferencing-framework-05 (work in progress),
        May 2005.

   [5]  Sperberg-McQueen, C., Paoli, J., Maler, E., and T. Bray,
        "Extensible Markup Language (XML) 1.0 (Second Edition)", World
        Wide Web Consortium
        FirstEdition http://www.w3.org/TR/2000/REC-xml-20001006,
        October 2000.

   [6]  Dawson, F. and Stenerson, D., "Internet Calendaring and
        Scheduling Core Object Specification (iCalendar)", RFC 2445,
        November 1998.

10.2.  Informative References

   [7]   Camarillo, G., "The Binary Floor Control Protocol (BFCP)",
         draft-ietf-xcon-bfcp-06 (work in progress), December 2005.

   [8]   Levin, O., "Centralized Conference Control Protocol",
         draft-levin-xcon-cccp-04 (work in progress), January 2006.

   [9]   Schulzrinne, H., "Common Policy: An XML Document Format for
         Expressing Privacy Preferences",
         draft-ietf-geopriv-common-policy-10 (work in progress),
         May 2006.

   [10]  Boulton, C. and U. Chandra, "Media Policy Templates for XCON",
         draft-boulton-xcon-media-template-02 (work in progress),
         October 2005.

   [11]  Camarillo, G., "Session Description Protocol (SDP) Format for
         Binary Floor Control Protocol  (BFCP) Streams",
         draft-ietf-mmusic-sdp-bfcp-03 (work in progress),
         December 2005.








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Authors' Addresses

   Oscar Novo
   Ericsson
   Hirsalantie 11
   Jorvas  02420
   Finland

   Email: Oscar.Novo@ericsson.com


   Gonzalo Camarillo
   Ericsson
   Hirsalantie 11
   Jorvas  02420
   Finland

   Email: Gonzalo.Camarillo@ericsson.com


   David P. Morgan
   Fidelity Investments
   82 Devonshire St, MZ V8C
   Boston, MA  02109-3614
   USA

   Email: Dave.Morgan@fmr.com


   Roni Even
   Polycom
   94 Derech Em Hamoshavot
   Petach Tikva  49130
   Israel

   Email: roni.even@polycom.co.il















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