Conference Information Data Model for Centralized Conferencing (XCON)
RFC 6501
| Document | Type | RFC - Proposed Standard (March 2012; No errata) | |
|---|---|---|---|
| Authors | David Morgan , Gonzalo Camarillo , Jari Urpalainen , Oscar Novo | ||
| Last updated | 2015-10-14 | ||
| Replaces | draft-novo-xcon-common-data-model | ||
| Stream | Internet Engineering Task Force (IETF) | ||
| Formats | plain text html pdf htmlized bibtex | ||
| Reviews | |||
| Stream | WG state | WG Document | |
| Document shepherd | No shepherd assigned | ||
| IESG | IESG state | RFC 6501 (Proposed Standard) | |
| Action Holders |
(None)
|
||
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Robert Sparks | ||
| IESG note | Alan Johnston (alan.b.johnston@gmail.com) is the Document Shepherd | ||
| Send notices to | (None) | ||
Internet Engineering Task Force (IETF) O. Novo
Request for Comments: 6501 G. Camarillo
Category: Standards Track Ericsson
ISSN: 2070-1721 D. Morgan
Fidelity Investments
J. Urpalainen
Nokia
March 2012
Conference Information Data Model
for Centralized Conferencing (XCON)
Abstract
RFC 5239 defines centralized conferencing (XCON) as an association of
participants with a central focus. The state of a conference is
represented by a conference object. This document defines an XML-
based conference information data model to be used for conference
objects. A conference information data model is designed to convey
information about the conference and about participation in the
conference. The conference information data model defined in this
document constitutes an extension of the data format specified in the
Session Initiation Protocol (SIP) event package for conference State.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc6501.
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RFC 6501 Data Model Schema March 2012
Copyright Notice
Copyright (c) 2012 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
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Contributions published or made publicly available before November
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than English.
Table of Contents
1. Introduction ....................................................4
2. Terminology .....................................................4
3. Overview ........................................................4
3.1. Data Model Format ..........................................5
3.2. Data Model Namespace .......................................5
3.3. The Conference Object Identifier ...........................5
3.3.1. Conference Object URI Definition ....................7
3.3.2. Normalization and Conference Object URI Comparison ..7
3.4. Data Model Structure .......................................7
4. Data Model Definition ...........................................8
4.1. <conference-info> .........................................12
4.2. <conference-description> ..................................12
4.2.1. <language> .........................................13
4.2.2. <allow-sidebars> ...................................13
4.2.3. <cloning-parent> ...................................13
4.2.4. <sidebar-parent> ...................................13
4.2.5. <conference-time> ..................................13
4.2.6. <conf-uris> ........................................15
4.2.7. <available-media> ..................................15
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4.3. <host-info> ...............................................18
4.4. <conference-state> ........................................18
4.4.1. <allow-conference-event-subscription> ..............18
4.5. <floor-information> .......................................18
4.5.1. <conference-ID> ....................................19
4.5.2. <allow-floor-events> ...............................19
4.5.3. <floor-request-handling> ...........................19
4.5.4. <conference-floor-policy> ..........................20
4.6. <users> ...................................................20
4.6.1. <join-handling> ....................................21
4.6.2. <user-admission-policy> ............................21
4.6.3. <allowed-users-list> ...............................22
4.6.4. <deny-users-list> ..................................23
4.6.5. <user> and Its <user> Sub-Elements .................24
4.6.5.1. <provide-anonymity> .......................25
4.6.5.2. <roles> ...................................26
4.6.5.3. <allow-refer-users-dynamically> ...........26
4.6.5.4. <allow-invite-users-dynamically> ..........26
4.6.5.5. <allow-remove-users-dynamically> ..........26
4.6.5.6. <endpoint> ................................27
4.7. <sidebars-by-ref> .........................................28
4.8. <sidebars-by-val> .........................................28
5. RELAX NG Schema ................................................28
6. XML Schema Extensibility .......................................39
7. XML Example ....................................................39
8. Security Considerations ........................................49
9. IANA Considerations ............................................51
9.1. RELAX NG Schema Registration ..............................51
9.2. XML Namespace Registration ................................52
9.3. Conference Object Identifier Registration .................52
9.4. Conference User Identifier Registration ...................53
10. Acknowledgements ..............................................53
11. References ....................................................53
11.1. Normative References .....................................53
11.2. Informative References ...................................54
Appendix A. Non-Normative RELAX NG Schema in XML Syntax ..........56
Appendix B. Non-Normative W3C XML Schema .........................84
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1. Introduction
There is a core data set of conference information that is utilized
in any conference, independent of the specific conference media.
This core data set, called the "conference information data model",
is defined in this document using an XML-based format. The
conference information data model defined in this document is
logically represented by the conference object.
Conference objects are a fundamental concept in centralized
conferencing, as described in the centralized conferencing framework
[RFC5239]. The conference object represents a particular
instantiation of a conference information data model. Consequently,
conference objects use the XML format defined in this document.
The Session Initiation Protocol (SIP) event package for conference
state, specified in [RFC4575], already defines a data format for
conferences. However, that model is SIP specific and lacks elements
related to some of the functionality defined by the centralized
conferencing framework [RFC5239] (e.g., floor control). The data
model defined in this document constitutes a superset of the data
format defined in [RFC4575]. The result is a data format that
supports more call signaling protocols (CSPs) besides SIP and that
covers all the functionality defined in the centralized conferencing
framework [RFC5239].
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 [RFC2119].
This document uses the terminology defined in the centralized
conferencing framework [RFC5239], the SIPPING conferencing framework
[RFC4353], and the BFCP (Binary Floor Control Protocol) specification
[RFC4582]. Readers of this document should be familiar with the
terminology used in those documents.
3. Overview
The data model specified in this document is the result of extending
the data format defined in [RFC4575] with new elements. Examples of
such extensions include scheduling elements, media control elements,
floor control elements, non-SIP URIs, and the addition of
localization extensions to text elements. This data model can be
used by conference servers providing different types of basic
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conferences. It is expected that this data model can be further
extended with new elements in the future in order to implement
additional advanced features.
3.1. Data Model Format
A conference object document is an XML [W3C.REC-xml-20081126]
document. Conference object documents MUST be based on XML 1.0 and
MUST be encoded using UTF-8.
The normative description of the syntax of the conference object
document, for use by implementers of parsers and generators, is found
in the RELAX NG schema provided in Section 5. Compliant messages
MUST meet the requirements of that schema.
3.2. Data Model Namespace
This specification defines a new namespace specification for
identifying the elements defined in the data model. This namespace
is as follows:
urn:ietf:params:xml:ns:xcon-conference-info
3.3. The Conference Object Identifier
The conference object identifier (XCON-URI) can be viewed as a key to
accessing a specific conference object. It can be used, for
instance, by the conference control protocol to access, manipulate
and delete a conference object. A conference object identifier is
provided to the conferencing client by the conference notification
service or through out-of-band mechanisms (e.g., email).
A conferencing system may maintain a relationship between the
conference object identifiers and the identifiers associated with
each of the complementary centralized conferencing protocols (e.g.,
call signaling protocol, BFCP, etc.). To facilitate the maintenance
of these relationships, the conference object identifier acts as a
top-level identifier within the conferencing system for the purpose
of identifying the interfaces for these other protocols. This
implicit binding provides a structured mapping of the various
protocols with the associated conference object identifier. Figure 1
illustrates the relationship between the identifiers used for the
protocols and the general conference object identifier (XCON-URI).
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+--------------------------+
| Conference |
| Object |
| Identifier |
+--------------------------+
| xcon:Ji092i@example.com |
+------+-------------------+
|
|
|
+-----------------+---------------+
| |
+-----------+-----------+ +----------+---------+
| CSP Conference IDs | |BFCP 'Conference ID'|
+-----------------------+ +--------------------+
| h323:i092@example.com | | i092 |
| tel:+44(0)2920930033 | +----------+---------+
| sip:i092@example.com | |
+-----------------------+ +-------+--------+
| BFCP 'Floor ID'|
+----------------+
| 543 |
| 236 |
+----------------+
Figure 1: Conference Object Mapping
In Figure 1, the conference object identifier acts as the top-level
key in the identification process. The call signaling protocols have
an associated conference user identifier, often represented in the
form of a URI. The BFCP, as defined in [RFC4582], defines the
'conference ID' identifier which represents a conference instance
within floor control. When created within the conferencing system,
the 'conference ID' has a 1:1 mapping to the unique conference object
identifier(XCON-URI). Operations associated with the conference
control protocols are directly associated with the conference object;
thus, the primary identifier associated with these protocols is the
conference object identifier(XCON-URI). The mappings between
additional protocols/interfaces is not strictly 1:1 and does allow
for multiple occurrences. For example, multiple call signaling
protocols will each have a representation that is implicitly linked
to the top-level conference object identifier, e.g., H323 and SIP
URIs that represent a conference instance. It should be noted that a
conferencing system is free to structure such relationships as
required, and this information is just included as a guideline that
can be used.
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Further elements can be added to the tree representation in Figure 1
to enable a complete representation of a conference instance within a
conferencing system.
3.3.1. Conference Object URI Definition
The syntax is defined by the following ABNF [RFC5234] rules.
XCON-URI = "xcon" ":" [conf-object-id "@"] host
conf-object-id = 1*( unreserved / "+" / "=" / "/" )
Note: host and unreserved are defined in RFC 3986 [RFC3986].
An XCON-URI is not designed to be resolved, and an application MUST
NOT attempt to perform a standard DNS lookup on the host portion of
such a URI in an attempt to discover an IP address or port at which
to connect.
3.3.2. Normalization and Conference Object URI Comparison
In order to facilitate the comparison of the XCON-URI identifiers,
all the components of the identifiers MUST be converted to lowercase.
After normalizing the URI strings, the URI comparison MUST be applied
on a character-by-character basis as prescribed by [RFC3986], Section
6.2.1.
The host construction, as defined in RFC 3986, can take the form of
an IP address, which is not conventionally compared on a character-
by-character basis. The host part of an XCON-URI serves only as an
identifier; that is, it is never used as an address. The character-
by-character comparison still applies.
3.4. Data Model Structure
The information in this data model is structured in the following
manner. All the information related to a conference is contained in
a <conference-info> element. The <conference-info> element contains
the following child elements:
o The <conference-description> element describes the conference as a
whole. It has, for instance, information about the URI of the
conference, maximum users allowed in the conference, media
available in the conference, or the time the conference will
start.
o The <host-info> element contains information about the entity
hosting the conference (e.g., its URI).
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o The <conference-state> element informs the subscribers about the
changes in the overall conference information.
o The <floor-information> element contains information about the
status of the different floors in the conference.
o The <users> element describes the membership information as a
whole. The <users> element contains a set of <user> child
elements, each describing a single participant in the conference.
o If a participant in the main conference joins a sidebar, a new
element is created in the conference referenced from the
<sidebars-by-ref> element or under one of the <sidebars-by-val>
elements.
Note that some of the elements described above such as <conference-
info>, <conference-description>, <sidebars-by-ref>, or <sidebars-by-
val> are not defined in the data model in this specification but are
defined in the data format of [RFC4575]. We describe them here
because they are part of the basic structure of the data model.
4. Data Model Definition
The following non-normative diagram shows the structure of conference
object documents. The symbol "!" preceding an element indicates that
the element is REQUIRED in the data model. The symbol "*" following
an element indicates that the element is introduced and defined in
this document. That is, elements without a "*" have already been
defined in [RFC4575].
!<conference-info>
|
|--<conference-description>
| |--<language>*
| |--<display-text>
| |--<subject>
| |--<free-text>
| |--<keywords>
| |--<allow-sidebars>*
| |--<cloning-parent>*
| |--<sidebar-parent>*
| |--<conference-time>*
| | |--<entry>*
| | | |--<base>*
| | | |--<mixing-start-offset>*
| | | |--<mixing-end-offset>*
| | | |--<can-join-after-offset>*
| | | |--<must-join-before-offset>*
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| | | |--<request-user>*
| | | |--<notify-end-of-conference>*
| | | |--<allowed-extend-mixing-end-offset>*
| | ...
| |--<conf-uris>
| | |--<entry>
| | | |--<uri>
| | | |--<display-text>
| | | |--<purpose>
| | | |--<conference-password>*
| | ...
| |--<service-uris>
| | |--<entry>
| | | |--<uri>
| | | |--<display-text>
| | | |--<purpose>
| | ...
| |--<maximum-user-count>
| | ...
| |--<available-media>
| | |--<entry>
| | | |--<display-text>
| | | |--<type>
| | | |--<status>
| | | |--<mixing-mode>*
| | | |--<codecs>*
| | | | |--<codec>*
| | | | | |--<subtype>*
| | | | |--<codec>*
| | | | | |--<subtype>*
| | | | ...
| | | |--<controls>*
| | | | |--<mute>*
| | | | |--<gain>*
| | | | ...
| | |--<entry>
| | | |--<display-text>
| | | |--<type>
| | | |--<status>
| | | |--<mixing-mode>*
| | | |--<codecs>*
| | | | |--<codec>*
| | | | | |--<subtype>*
| | | | |--<codec>*
| | | | | |--<subtype>*
| | | | ...
| | | |--<controls>*
| | | | |--<pause-video>*
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| | | | |--<video-layout>*
| | | | ...
| | ...
|
|--<host-info>
| |--<display-text>
| |--<web-page>
| |--<uris>
| | |--<entry>
| | | |--<uri>
| | | |--<display-text>
| ...
|--<conference-state>
| |--<allow-conference-event-subscription>*
| |--<user-count>
| |--<active>
| |--<locked>
|
|--<floor-information>*
| |--<conference-ID>*
| |--<allow-floor-events>*
| |--<floor-request-handling>*
| |--<conference-floor-policy>*
| | |--<floor>*
| | | |--!<media-label>*
| | | |--<algorithm>*
| | | |--<max-floor-users>*
| | | |--<moderator-id>*
| | | ...
| | ...
|
|--<users>
| |--<join-handling>*
| |--<user-admission-policy>*
| |--<allowed-users-list>*
| | |--<target>*
| | |
| | |--<persistent-list>*
| | | |--<user>*
| | | | |-- <email>*
| |
| |--<deny-users-list>*
| |
| |--<user>
| | |--<display-text>
| | |--<associated-aors>
| | |--<provide-anonymity>*
| | |--<roles>
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| | | |
| | | ...
| | |--<languages>
| | |--<cascaded-focus>
| | |--<allow-refer-users-dynamically>*
| | |--<allow-invite-users-dynamically>*
| | |--<allow-remove-users-dynamically>*
| | |--<endpoint>
| | | |--<display-text>
| | | |--<referred>
| | | |--<status>
| | | |--<joining-method>
| | | |--<joining-info>
| | | |--<disconnection-method>
| | | |--<disconnection-info>
| | | |--<media>
| | | | |--<type>
| | | | |--<display-text>
| | | | |--<label>
| | | | |--<src-id>
| | | | |--<status>
| | | | |--<to-mixer>*
| | | | | |--<floor>*
| | | | | |--<controls>*
| | | | | | |--<mute>*
| | | | | | |--<gain>*
| | | | | | ...
| | | | |--<from-mixer>*
| | | | | |--<floor>*
| | | | | |--<controls>*
| | | | | | |--<pause-video>*
| | | | | | ...
| | | | ...
| | | |--<call-info>
| | | | |--<sip>
| | | | | |--<display-text>
| | | | | |--<call-id>
| | | | | |--<from-tag>
| | | | | |--<to-tag>
| ... ...
|--<sidebars-by-ref>
| |--<entry>
| | |-- <user>
| | |-- <display-text>
| |--<entry>
| | |-- <user>
| | |-- <display-text>
| ...
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RFC 6501 Data Model Schema March 2012
|--<sidebars-by-val>
| |--<entry>
| | |
| | ...
| |--<entry>
| | |
| ... ...
The following sections describe these elements in detail. The full
RELAX NG schema is provided in Section 5.
4.1. <conference-info>
A conference object document begins with the root element
<conference-info>, which is defined in [RFC4575]. The 'state' and
'version' attributes of the <conference-info> element are defined in
[RFC4575] and are not used in the context of the XCON Conference
Information Model since they apply only to notification mechanisms.
In addition, [RFC4575] defines an 'entity' attribute that contains
the SIP URI identifier. This specification extends the meaning of
the 'entity' attribute to the conference object identifier (XCON-URI)
explained in Section 3.3.
This specification adds to the <conference-info> element the child
elements of the <floor-information> element.
4.2. <conference-description>
The <conference-description> element, which is defined in [RFC4575],
describes the conference as a whole. It SHOULD have an attribute
'lang' to specify the language used in the contents of this element.
It is comprised of <language>, <display-text>, <subject>, <free-
text>, <keywords>, <allow-sidebars>, <cloning-parent>, <sidebar-
parent>, <conference-time>, <conf-uris>, <service-uris>, <maximum-
user-count>, and <available-media>. The <display-text>, <subject>,
<free-text>, <keywords>, <service-uris>, and <maximum-user-count>
elements are described in Section 5.3 of [RFC4575].
The following sections describe these elements in more detail. Other
child elements MAY be defined in the future to extend the
<conference-description> element.
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4.2.1. <language>
The <language> element indicates the predominant language that is
expected to be employed within a conference. This element contains
only one language. The possible values of this element are the
values of the 'Subtag' column of the "Language Subtag Registry" at
[IANA-Lan] originally defined in [RFC5646]. This element does not
enforce the language of the conference: it only informs the
participants about the desirable language that they should use in the
conference. Participants are free to switch to other languages if
they like.
4.2.2. <allow-sidebars>
The <allow-sidebars> element represents a boolean value. If set to
true or "1", the conference is allowed to create sidebar conferences.
If absent, or set to "false" or "0", the conference cannot create
sidebar conferences.
4.2.3. <cloning-parent>
When the <cloning-parent> is present, it indicates that the
conference object is a child of a parent conference. The <cloning-
parent> element contains the conference object identifier (XCON-URI)
(different from the main XCON-URI) of the parent.
4.2.4. <sidebar-parent>
When the <sidebar-parent> is present, it indicates that the
conference object represents a sidebar of another conference. The
<sidebar-parent> element contains the conference object identifier
(XCON-URI) (different from the main XCON-URI) of the parent.
4.2.5. <conference-time>
The <conference-time> element contains the information related to
time, policy, and duration of a conference. The <conference-time>
element contains one or more <entry> elements, each defining the time
and policy information specifying a single conference occurrence.
The <conference-time> element differs from the iCalendar objects
[RFC5545] in that it has the ability to define different policies
(<can-join-after-offset>, <must-join-before-offset>) for the same
conference at different times.
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Every <entry> element contains the following child elements:
o <base>: The <base> child element specifies the iCalendar object of
the conference. The iCalendar object components are defined in
[RFC5545].
o <mixing-start-offset>: The <mixing-start-offset> child element
specifies when the conference media mixing starts before the
conference starts. The <mixing-start-offset> element specifies an
absolute value rather than an offset value. If the <mixing-start-
offset> element is not present, it indicates that the conference
media mixing starts immediately. The <mixing-start-offset> MUST
include the 'required-participant' attribute. This attribute
contains one of the following values: "none", "administrator",
"moderator", "user", "observer", and "participant". The roles'
semantic definitions are out of the scope of this document and are
subject to future policy documents. More values can be specified
in the future. The 'required-participant' 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
arrives. If the value is set to "none", mixing starts according
to the mixing start time.
o <mixing-end-offset>: The <mixing-end-offset> child element
specifies the time conference media mixing stops after the
conference stops. If the <mixing-end-offset> element is not
present, it indicates that the conference occurrence is not
bounded. The <mixing-end-offset> element MUST include the
'required-participant' attribute. This attribute contains one of
the following values: "none", "administrator", "moderator",
"user", "observer", and "participant". More values can be
specified in the future. The 'required-participant' 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 leaves. If the value is set to "none", mixing stops
according to the <mixing-end-offset>. If the conference policy
was modified so that the last privileged user is now a normal
conference participant, and the conference requires a privileged
user to continue, that conference MUST terminate.
o <can-join-after-offset>: An administrator can indicate the time
when users can join a conference by populating the <can-join-
after-offset> element.
o <must-join-before-offset>: An administrator can define the time
after which new users are not allowed to join the conference
anymore.
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RFC 6501 Data Model Schema March 2012
o <request-user>: This element defines the time when users or
resources on the <allowed-users-list> are requested to join the
conference by using the <request-users> element.
o <notify-end-of-conference>: The <notify-end-of-conference> element
defines in seconds when the system MUST send a notification that
the end of the conference is approaching. If the <notify-end-of-
conference> element is not present, this indicates that the system
does not notify the users when the end of the conference is
approaching.
o <allowed-extend-mixing-end-offset>: The <allowed-extend-mixing-
end-offset> element indicates if the conference is allowed to be
extended. It has a boolean value.
4.2.6. <conf-uris>
The <conf-uris> contains a set of <entry> child elements -- each
containing a new element: <conference-password>. This element
contains the password(s) of the conference, for instance, Public
Switched Telephone Network (PSTN) conference will store the 'PIN
code' in this element. All the other <conf-uris> child elements are
described in Section 5.3.1 of [RFC4575].
The RELAX NG schema in Section 5 allows <conference-password> to
appear anywhere uris-type is expanded. This document only provides
meaning for <conference-password> appearing as a descendant of the
<conf-uris> element. Future standardization may give meaning to
<conference-password> appearing in other elements of type "uris-
type". In the absence of such standardization, <conference-password>
MUST NOT appear in elements of type "uris-type" other than <conf-
uris>.
4.2.7. <available-media>
The <available-media> element consists of a sequence of <entry> child
elements. Each <entry> element MAY contain the following child
elements:
o The <display-text>, <type>, and <status> elements are described in
Section 5.3.4 of [RFC4575].
o The child element <mixing-mode> describes a default scheduling
policy by which the mixer will build the outgoing stream from the
incoming streams. Note that this policy is different than the
policy describing the floors for each media. The <mixing-mode>
child element MUST contain one and only one of the "moderator-
controlled", "FCFS", and "automatic" values, indicating the
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default algorithm to use with every media stream. The "moderator-
controlled" value indicates that the moderator of the conference
controls the media stream policy. The "FCFS" value indicates a
'first-come-first-served' policy. The "automatic" value means the
mixer must choose the best scheduling policy for the conference.
o 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 approval
of the moderator of the conference ("automatic", "moderator-
controlled"). The <codecs> element contains <codec> elements. A
<codec> element can have the attribute 'name' and 'policy'. The
'name' attribute is a codec identifier assigned by the
conferencing server. The 'policy' attribute contains the policy
for that codec (allowed or disallowed). The <codec> element has
the child element <subtype>, which stores the codec's name. The
possible values of this element are the values of the 'subtype'
column of the "RTP Payload Format media types" registry at [IANA]
originally defined in [RFC4855]. It is expected that future
conferencing specifications will define corresponding schema
extensions, as appropriate.
o The <controls> element contains the basic audio and video global
control elements for a conference. These controls are sufficient
for the majority of basic conferences. If the conference server
wants to support more-advanced controls, then it is RECOMMENDED
that an extension to the data model be used. In the <controls>
element, the schema is extensible; hence, new control types can be
added in the future. So, moderator controls that affect all media
output would go under the <available-media> element. The
following child elements are defined for <controls>:
* The <mute> element is used in conjunction with an audio stream
to cease transmission of any audio from the associated stream.
That means that for the entire duration where mute is
applicable, all current and future participants of the
conference are muted and will not send any audio. It has a
boolean value. If this control is not specified, access to the
control is not available to the client.
* The <pause-video> element is used in conjunction with a video
stream to cease transmission of associated media. It has a
boolean value. If this control is not specified, the access to
the control is not available to the client.
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* The <gain> element is used in conjunction with a media output
stream to indicate the amount of amplification of an audio
stream. The value is an integer number that ranges from -127
to 127. If this control is not specified, access to the
control is not available to the client.
* The <video-layout> element is used in conjunction with a video
stream to specify how the video streams (of participants) are
viewed by each participant. Only one layout type can be
specified for each output stream. If there are fewer
participants than panels in the specified layout, then blanking
(black screen) MAY be mixed into the stream on the behalf of
the missing input streams. If unspecified, the <video-layout>
default type SHOULD be "single-view". The <video-layout> types
are as follows, although any number of custom layouts may be
specified in future extensions:
+ single-view: Only one stream is presented by the focus to
all participants in one panel.
+ dual-view: This dual-view option will present the video
side-by-side in two panels and not alter the aspect ratio of
the streams. This will require the focus to introduce
blanking on parts of the overall image as viewed by the
participants.
+ dual-view-crop: This side-by-side layout option instructs
the focus to alter the aspect ratio of the streams (alter-
aspect-ratio=true) so that blanking is not necessary. The
focus handles the cropping of the streams.
+ dual-view-2x1: This layout option instructs the focus to
place one stream above the other, in essence, with two rows
and one column. In this option, the aspect ratio is not
altered and blanking is introduced.
+ dual-view-2x1-crop: This layout option also instructs the
focus to place one stream above the other, in essence, with
two rows and one column. In this option, the aspect ratio
is altered and the video streams are cropped.
+ quad-view: Four equal-sized panels in a 2x2 layout are
presented by the focus to all participants. Typically, the
aspect ratio of the streams are maintained (alter-aspect-
ratio= FALSE).
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+ multiple-3x3: Nine equal-sized panels in a 3x3 layout are
presented by the focus to all participants. Typically, the
aspect ratio of the streams are preserved.
+ multiple-4x4: 16 equal-sized panels in a 4x4 layout are
presented by the focus to all participants. Typically, the
aspect ratio of the streams are preserved.
+ multiple-5x1: This option refers to a 5x1 layout where one
panel will occupy 4/9 of the mixed video stream while the
others will each occupy 1/9 of the stream. Typically, the
aspect ratio of the streams is preserved.
+ automatic: This option allows the focus to add panels as
streams are added.
4.3. <host-info>
The <host-info> element and its child elements are described in
[RFC4575], Section 5.4.
4.4. <conference-state>
The <conference-state> is introduced in [RFC4575]. The <conference-
state> element contains the <allow-conference-event-subscription>,
<user-count>, <active>, and <locked> child elements. The <user-
count>, <active>, and <locked> child elements are defined in
[RFC4575], Section 5.5.
4.4.1. <allow-conference-event-subscription>
The <allow-conference-event-subscription> element represents a
boolean action. If set to true, the focus is instructed to allow the
subscription to conference state events, such as 'SIP event package
for conference state' [RFC4575]. If set to FALSE, the subscription
to conference state events MUST be rejected. If this element is
undefined, it has a default value of true, causing the subscription
to conference state events to be accepted.
4.5. <floor-information>
The <floor-information> element contains the <conference-ID>, <allow-
floor-events>, <floor-request-handling>, and <conference-floor-
policy> child elements. The absence of this element from an XML
document indicates that the conference does not have a floor.
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4.5.1. <conference-ID>
The <conference-ID> represents a conference instance within floor
control. When BFCP serves as the floor control protocol, the
<conference-ID> is a 32-bit BFCP conference identifier defined in
[RFC4582], Section 5.1. Note that when created within the
conferencing system, there is a 1:1 mapping between this
<conference-ID> and the unique conference object identifier (XCON-
URI).
4.5.2. <allow-floor-events>
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 default
value of FALSE, causing the subscription to floor control events to
be rejected.
A conference participant can subscribe himself to a floor control
event in two different ways: one method is using an offer/answer
exchange mechanism ([RFC3264]) using SIP INVITE and BFCP parameters
in the SDP [RFC4583], the other method is a general authorization
mechanism described in Section 9 of [RFC4582] and in [RFC5018].
Future documentation may define additional connection mechanisms.
4.5.3. <floor-request-handling>
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 the
following:
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
or deny the floor. The algorithms used are outside the scope of
this document.
Note that this section discusses floor control information;
therefore, the value "block" in a <floor-request-handling> element is
not related with the "block" value in the <join-handling> element
(see Section 4.6.1).
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4.5.4. <conference-floor-policy>
The <conference-floor-policy> element has one or more <floor> child
elements. Every <floor> child elements has an attribute 'id', which
uniquely identifies a floor within a conference. In the case of BFCP
[RFC4582], the 'id' attribute corresponds to the floor-id identifier
defined in [RFC4582], Section 5.2.2.
o <media-label>: Every floor is identified for one or more mandatory
<media-label> elements. If the <available-media> information is
included in the conference document, the value of this element
MUST be equal to the "label" value of the corresponding media
stream <entry> in the <available-media> container. The number of
those elements indicates how many floors the conference can have.
A floor can be used for one or more media types;
o <algorithm>: A floor can be controlled using many algorithms; the
mandatory <algorithm> element MUST be set to any of the
"moderator-controlled", "FCFS", or "random" values indicating the
algorithm. The "moderator-controlled" value indicates that the
moderator of the conference controls the floor. The "FCFS" value
indicates a 'first-come-first-served' policy.
o <max-floor-users>: The <max-floor-users> child element in the
<floor> element is OPTIONAL and, if present, dictates the maximum
number of users who can have the floor at one time.
o <moderator-id>: The OPTIONAL <moderator-id> indicates the "User
ID" of the moderator(s). It MUST be set if the element
<algorithm> is set to the "moderator-controlled" value. When the
floor is created within the conferencing system, the XCON-USERID
MAY be used as the <moderator-id>. In the case where the BFCP is
the floor control protocol, the <moderator-id> is defined in
[RFC4582], Section 3. Note that [RFC4582] refers to the moderator
role as a "floor chair".
4.6. <users>
The <users> element is described in [RFC4575] and contains the <join-
handling>, <user-admission-policy>, <allowed-users-list>, and <deny-
users-list> defined in this document and <user> child elements
defined in [RFC4575]. When the <users> element is used in the
context of the XCON Conference Information Model, the 'state' and
'version' attributes defined in [RFC4575] are not used, since they
apply only to notification mechanisms. The following sections
describe these elements in more detail. Other child elements and
attributes can be used to extend <users> in the future.
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4.6.1. <join-handling>
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 "authenticate": This action instructs the focus that the user has
to provide a combination of username/password.
o "directed-operator": This action instructs the focus to direct the
user to an operator.
4.6.2. <user-admission-policy>
The <user-admission-policy> is an element that lets an organizer (or
a participant with appropriate rights) choose a policy for the
conference that controls how users are authenticated into the
conference, using a mechanism of the conference's choosing. Since a
variety of signaling protocols are possible, a variety of
authentication mechanisms -- determined by every individual
conference server -- may need to be mapped from the different
protocols. The specific types of authentication mechanisms are
beyond the scope of this document. The list of possible values are
as follows:
o "closedAuthenticated": A 'closedAuthenticated' policy MUST have
each conference participant in the allowed users list (listed
under the <allowed-users-list> element) with each participant
being sufficiently (up to local policy) authenticated. Conference
join requests for users not in the allowed users list or
participants not authenticated should be rejected unless a <join-
handling> action of 'confirm' is selected; in which case, the user
is placed on a pending list as indicated earlier. A
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'closedAuthenticated' policy MUST NOT include a <deny-users-list>.
If <deny-users-list> appears in the data model, it MUST be
ignored.
o "openAuthenticated": An 'openAuthenticated' policy requires each
conferencing participant to be sufficiently authenticated.
Typically, this implies that anyone capable of authenticating with
the conferencing system may join the conference. The
'openAuthenticated' policy permits the specification of "banned"
conferencing participants. Such banned users are prevented from
re-joining the conference until they have been un-banned. An
'openAuthenticated' policy SHOULD have a deny users list (listed
under the <deny-users-list> XML element) to support the banning of
conferencing participants from a conference. An
'openAuthenticated' policy MUST NOT include an <allowed-users-
list>. If <allowed-users-list> appears in the data model, it MUST
be ignored.
o "anonymous": An 'anonymous' policy grants any join requests and is
the least restrictive policy. An 'anonymous' policy MUST NOT
include either an <allowed-users-list> or a <deny-users-list>. If
any of these lists appear in the data model, they MUST be ignored.
In all other cases, the appearance of an <allowed-users-list> and
<deny-users-list> MUST be ignored, except as otherwise described in a
future specification. Future specifications describing the use of
these lists must provide clear guidance on how to process the lists
when they occur concurrently, especially when both lists contain the
same user. For example, such a specification could disallow both
lists from appearing at the same time similar to <user-admission-
policy> values defined in this document.
4.6.3. <allowed-users-list>
The <allowed-users-list> child element contains a list of user URIs
(e.g., XCON-USERID, as defined in Section 4.6.5), roles (defined in
Section 4.6.5.2), or domains (e.g., *@example.com) that the focus
uses to determine who can join the conference, who can be invited to
join a conference, or who the focus needs to "refer to" the
conference. The <allowed-users-list> element includes zero or more
<target> child elements. This child element includes the mandatory
'uri' attribute and the mandatory 'method' attribute. The same 'uri'
attribute with different method values can appear in the list more
than once.
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The 'method' attribute is a list with the following values:
o "dial-in": The value "dial-in" is used by the focus to determine
who can join the conference.
o "dial-out": The value "dial-out" contains a list of resources with
which the focus will initiate a session.
o "refer": The value "refer" is used by the focus to determine the
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" value differs from "dial-out" in that the resources on
the "refer" value are expected to initiate the session establishment
toward the focus themselves. It is also envisioned that different
users will have different access rights to those lists and therefore
a separation between the two is needed.
The <allowed-users-list> element has a <persistent-list> child
element as well. Some chat room systems allow -- and some require --
registration of detailed information about a user before they are
allowed to join a chat room. The <persistent-list> child element
stores persistent information about users who are not actively part
of an ongoing chat room session. The <persistent-list> element
stores the following information:
o user: The <user> element stores the name, nickname, conference
user identifier (XCON-USERID), and email address of a user. It
has three attributes: 'name', 'nickname', and 'id' and an <email>
element. Future extensions to this schema may define new elements
for the <user> element.
Future extensions to this schema may define new elements for the
<target> element.
4.6.4. <deny-users-list>
The <deny-users-list> child element contains a list of user URIs
(e.g., SIP URI, XCON-USERID defined in Section 4.6.5), roles (defined
in Section 4.6.5.2), or domains (e.g.: *@example.com) that the focus
uses to determine who has been 'banned' from the conference. Such
banned users are prevented from re-joining the chat room until the
ban has been lifted.
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4.6.5. <user> and Its <user> Sub-Elements
The element <user> is described in [RFC4575] and describes a single
participant in the conference. The <user> element has an attribute
'entity'. However, when the <user> element is used in the context of
the XCON Conference Information Model, the 'state' and 'version'
attributes defined in [RFC4575] are not used, since they only apply
to notification mechanisms.
The attribute 'entity' contains a unique conference user identifier
(XCON-USERID) within the scope of the conference. The URI format of
this identifier is as follows (using ABNF [RFC5234]):
XCON-USERID = "xcon-userid" ":" conf-user-id
conf-user-id = 1*unreserved
Note: unreserved is defined in RFC 3986.
In order to facilitate the comparison of the XCON-USERID identifiers,
all the components of the identifiers MUST be converted to lowercase.
After normalizing the URI strings, the URIs comparison MUST be
applied codepoint-by-codepoint after conversion to a common character
encoding, as prescribed by [RFC3986], Section 6.2.1.
Other user identifiers can be associated with this conference user
identifier and enable the conferencing system to correlate and map
these multiple authenticated user identities to a single global user
identifier. Figure 2 illustrates an example using the conference
user identifier in association with the user identity defined for
BFCP, SIP, and H323 user identity. It should be noted that a
conferencing system is free to structure such relationships as
required, and this information is just included as a guideline.
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+----------------+
| Conference |
| User |
| Identifier |
+----------------+
|XCON-USERID:John|
+-------+--------+
|
|
|
+----------------------+-------------------------+
| | |
+-------+--------+ +-----------+-----------+ +-----------+-----------+
| BFCP User ID | | SIP User URI | | H323 User URI |
+----------------+ +-----------------------+ +-----------------------+
| 543 | |sip:851221@example.com | |h323:taeduk@example.com|
+----------------+ +-----------------------+ +-----------------------+
Figure 2: Conference User Mapping
The element <user> element contains the <display-text>, <associated-
aors>, <provide-anonymity>, <roles>, <languages>, <cascaded-focus>,
<allow-refer-users-dynamically>, <allow-invite-users-dynamically>,
<allow-remove-users-dynamically>, and <endpoint>. The following
sections describe these elements in more detail. The <display-text>,
<associated-aors>, <languages>, and <cascaded-focus> are defined in
[RFC4575], Section 5.6.
4.6.5.1. <provide-anonymity>
The <provide-anonymity> element specifies what level of anonymity the
server should provide to the user. In this case, the focus provides
the rest of the participants with an anonymous identity for that
user, for example, anonymousX, or it does not provide any information
for that user such that other users cannot see he is a participant in
the conference. This element only affects the way the user
information is provided to the other participants. The real user
information is stored in the data model but SHOULD NOT be provided to
the other participants of the conference. This can be achieved by
using the <provide-anonymity> element. This element has three
values: "private", "semi-private", and "hidden". The "private" value
specifies that this user is completely anonymous in the conference.
The "semi-private" value specifies that this user is anonymous to all
users who have not been granted permission to see him. The "hidden"
value specifies that other users cannot see this participant in the
conference.
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4.6.5.2. <roles>
A <role> provides the context for the set of conference operations
that a participant can perform. This element can contain one or more
of the following values: "administrator", "moderator", "user",
"participant", "observer", and "none". A role of "none" indicates
that any role is assigned. The <roles> semantic definition is out of
the scope of this document and is subject to future policy documents.
This element can be extended with new roles in future documents.
4.6.5.3. <allow-refer-users-dynamically>
The <allow-refer-users-dynamically> element represents a boolean
value. If set to true, a participant is allowed to instruct the
focus to refer a user to the conference without modifying the
<allowed-users-list> (in SIP terms, a participant is allowed to send
a REFER request [RFC3515] 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
request to be rejected.
4.6.5.4. <allow-invite-users-dynamically>
The <allow-invite-users-dynamically> element represents a boolean
action. If set to true, a participant is allowed to instruct the
focus to invite a user to the conference without modifying the
<allowed-users-list> list (in SIP terms, a participant is allowed to
send a REFER request [RFC3515] 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 request to be rejected.
4.6.5.5. <allow-remove-users-dynamically>
The <allow-remove-users-dynamically> element represents a boolean
action. If set to true, a participant is allowed to instruct the
focus to remove a user from the conference without modifying the
ruleset (in SIP terms, a participant is allowed to send a REFER
request [RFC3515] to the focus, which results in the focus sending a
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 request to be
rejected.
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4.6.5.6. <endpoint>
The <endpoint> child element is identical to the element with the
same name in [RFC4575] except that the 'state' attribute is not
included. When the <endpoint> element is used in the context of the
XCON Conference Information Model, the 'state' and 'version'
attributes defined in [RFC4575] are not used, since they apply only
to notification mechanisms. The <endpoint> element can provide the
desired level of detail about the user's devices and their signaling
sessions taking part in the conference.
The <endpoint> element has the following child elements: <display-
text>, <referred>, <status>, <joining-method>, <joining-info>,
<disconnection-method>, <disconnection-info>, <media>, and <call-
info>. All the <endpoint> child elements are defined in [RFC4575]
with the exception of the <to-mixer> element and the <from-mixer>
element.
The <endpoint>/<media> element has two other child elements defined
in this document: the <to-mixer> and the <from-mixer>:
o <from-mixer>, <to-mixer>: These are controls that apply to a
user's media stream being sent from the mixer to the participant's
endpoint or to the mixer from the participant's endpoint. The
<to-mixer> element details properties associated with the incoming
streams to the mixer (streams sent to the mixer from the
participant). The <from-mixer> element details properties
associated with the outgoing streams from the mixer (sent from the
mixer to the participant). Both of these elements have the
attribute 'name'. The 'name' attribute has the values "VideoIn",
"VideoOut", "AudioOut", and "AudioIn". The "VideoOut" and
"AudioOut" media streams detail properties associated with the
outgoing video and audio from the mixer. The "VideoIn" and
"AudioIn" media stream details properties associated with the
incoming video and audio to the mixer. Both of these elements can
have the <floor> child element defined:
* The <floor> element refers to the floor assigned to a certain
participant in the conference. If a participant, for instance,
needs to talk in the conference, it first needs to get the
floor from the chair of the conference. The <floor> element
has an attribute 'id', which uniquely identifies a floor within
a conference. The 'id' attribute corresponds to the floor-id
identifier defined in [RFC4582], Section 5.2.2. The <floor>
element has a boolean value. A value of FALSE indicates that
this user does not hold the floor in this moment. If this
control is not specified, this user SHOULD NOT specify the
floor option.
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The <to-mixer> and <from-mixer> elements can have the <controls>
child element:
* Controls that apply to a specific user would appear under the
<controls> element.
o More values can be defined in the future.
4.7. <sidebars-by-ref>
The <sidebars-by-ref> element contains a set of <entry> child
elements. This element is described in [RFC4575], Section 5.9.1.
When the <sidebars-by-ref> element is used in the context of the XCON
conference information model, the 'state' and 'version' attributes
defined in [RFC4575] are not used, since they apply only to
notification mechanisms.
4.8. <sidebars-by-val>
The <sidebars-by-val> element contains a set of <entry> child
elements each containing information about a single sidebar. This
element is described in [RFC4575], Section 5.9.2. When the
<sidebars-by-val> element is used in the context of the XCON
conference information model, the 'state' and 'version' attributes
defined in [RFC4575] are not used, since they apply only to
notification mechanisms.
5. RELAX NG Schema
In accordance with the centralized conferencing framework document
[RFC5239], the conference object is a logical representation of a
conference instance. The conference information schema contains core
information that is utilized in any conference. It also contains the
variable information part of the conference object.
The normative schema is backwards compatible with [RFC5239], in other
words, valid [RFC5239] instance documents are also valid according to
this RELAX NG schema [RELAX]. In addition to approximately similar
RELAX NG [RELAX] definitions of [RFC5239], this schema contains
extension elements in the
"urn:ietf:params:xml:ns:xcon-conference-info" namespace.
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default namespace = "urn:ietf:params:xml:ns:conference-info"
namespace xcon = "urn:ietf:params:xml:ns:xcon-conference-info"
start = element conference-info { conference-type }
# CONFERENCE TYPE
conference-type =
attribute entity { text }
& anyAttribute
& conference-description-type?
& element host-info { host-type }?
& element conference-state { conference-state-type }?
& element users { users-type }?
& element sidebars-by-ref { uris-type }?
& element sidebars-by-val { sidebars-by-val-type }?
& element xcon:floor-information { floor-information-type }?
& anyElement*
# CONFERENCE DESCRIPTION TYPE
conference-description-type =
element conference-description {
attribute xml:lang { xsd:language }?
& anyAttribute
& element display-text { text }?
& element subject { text }?
& element free-text { text }?
& element keywords {
list { xsd:string* }
}?
& element conf-uris { uris-type }?
& element service-uris { uris-type }?
& element maximum-user-count { xsd:int }?
& element available-media { conference-media-type }?
& element xcon:language { xsd:language }?
& element xcon:allow-sidebars { xsd:boolean }?
& element xcon:cloning-parent { xsd:anyURI }?
& element xcon:sidebar-parent { xsd:anyURI }?
& element xcon:conference-time { conferencetime-type }?
& anyElement*
}
# HOST TYPE
host-type =
element display-text { text }?
& element web-page { xsd:anyURI }?
& element uris { uris-type }?
& anyElement*
& anyAttribute
# CONFERENCE STATE TYPE
conference-state-type =
anyAttribute
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& element user-count { xsd:unsignedInt }?
& element active { xsd:boolean }?
& element locked { xsd:boolean }?
& element xcon:allow-conference-event-subscription { xsd:boolean }?
& anyElement*
# CONFERENCE MEDIA TYPE
conference-media-type =
anyAttribute
& element entry { conference-medium-type }*
& anyElement*
# CONFERENCE MEDIUM TYPE
conference-medium-type =
attribute label { text }
& anyAttribute
& element display-text { text }?
& element type { text }?
& element status { media-status-type }?
& element xcon:mixing-mode { mixing-mode-type }?
& element xcon:codecs { codecs-type }?
& element xcon:controls { control-type }?
& anyElement*
# URIs TYPE
uris-type =
anyAttribute
& element entry { uri-type }*
& anyElement*
# URI TYPE
uri-type =
element uri { xsd:anyURI }
& element display-text { text }?
& element purpose { text }?
& element modified { execution-type }?
& element xcon:conference-password { text }*
& anyElement*
& anyAttribute
# USERS TYPE
users-type =
anyAttribute
& element user { user-type }*
& element xcon:join-handling { join-handling-type }?
& element xcon:user-admission-policy { user-admission-policy-type }?
& element xcon:allowed-users-list { allowed-users-list-type }?
& element xcon:deny-users-list { deny-user-list-type }?
& anyElement*
# USER TYPE
user-type =
attribute entity { xsd:anyURI }
& anyAttribute
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& element display-text { text }?
& element associated-aors { uris-type }?
& element roles {
element entry { single-role-type }+
}?
& element languages {
list { xsd:language }
}?
& element cascaded-focus { xsd:anyURI }?
& element endpoint { endpoint-type }*
& element xcon:provide-anonymity { provide-anonymity-type }?
& element xcon:allow-refer-users-dynamically { xsd:boolean }?
& element xcon:allow-invite-users-dynamically { xsd:boolean }?
& element xcon:allow-remove-users-dynamically { xsd:boolean }?
& anyElement*
# ENDPOINT TYPE
endpoint-type =
attribute entity { text }
& anyAttribute
& element display-text { text }?
& element referred { execution-type }?
& element status { endpoint-status-type }?
& element joining-method { joining-type }?
& element joining-info { execution-type }?
& element disconnection-method { disconnection-type }?
& element disconnection-info { execution-type }?
& element media { media-type }*
& element call-info { call-type }?
& anyElement*
# ENDPOINT STATUS TYPE
endpoint-status-type =
"pending"
| "dialing-out"
| "dialing-in"
| "alerting"
| "on-hold"
| "connected"
| "muted-via-focus"
| "disconnecting"
| "disconnected"
| free-text-extension
# JOINING TYPE
joining-type =
"dialed-in" | "dialed-out" | "focus-owner" | free-text-extension
# DISCONNECTION TYPE
disconnection-type =
"departed" | "booted" | "failed" | "busy" | free-text-extension
# EXECUTION TYPE
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execution-type =
element when { xsd:dateTime }?
& element reason { text }?
& element by { xsd:anyURI }?
& anyAttribute
# CALL TYPE
call-type =
element sip { sip-dialog-id-type }
& anyElement*
& anyAttribute
# SIP DIALOG ID TYPE
sip-dialog-id-type =
element display-text { text }?
& element call-id { text }
& element from-tag { text }
& element to-tag { text }
& anyElement*
& anyAttribute
# MEDIA TYPE
media-type =
attribute id { xsd:int }
& anyAttribute
& element display-text { text }?
& element type { text }?
& element label { text }?
& element src-id { text }?
& element status { media-status-type }?
& element xcon:to-mixer { mixer-type }?
& element xcon:from-mixer { mixer-type }?
& anyElement*
# MEDIA STATUS TYPE
media-status-type =
"recvonly"
| "sendonly"
| "sendrecv"
| "inactive"
| free-text-extension
# SIDEBARS-BY-VAL TYPE
sidebars-by-val-type =
anyAttribute
& element entry { conference-type }*
& anyElement*
# CONFERENCE TIME
conferencetime-type =
anyAttribute
& element xcon:entry {
element xcon:base { text },
element xcon:mixing-start-offset {
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time-type,
attribute required-participant { single-role-type },
anyAttribute
}?,
element xcon:mixing-end-offset {
time-type,
attribute required-participant { single-role-type },
anyAttribute
}?,
element xcon:can-join-after-offset { time-type }?,
element xcon:must-join-before-offset { time-type }?,
element xcon:request-user { time-type }?,
element xcon:notify-end-of-conference { xsd:nonNegativeInteger }?,
element xcon:allowed-extend-mixing-end-offset { xsd:boolean }?,
anyElement*
}*
# TIME TYPE
time-type = xsd:dateTime { pattern = ".+T.+Z.*" }
# SINGLE ROLE TYPE
single-role-type =
xsd:string "none"
| xsd:string "administrator"
| xsd:string "moderator"
| xsd:string "user"
| xsd:string "observer"
| xsd:string "participant"
| free-text-extension
# MIXING MODE TYPE
mixing-mode-type =
xsd:string "moderator-controlled"
| xsd:string "FCFS"
| xsd:string "automatic"
| free-text-extension
# CODECS TYPE
codecs-type =
attribute decision { decision-type }
& anyAttribute
& element xcon:codec { codec-type }*
& anyElement*
# CODEC TYPE
codec-type =
attribute name { text }
& attribute policy { policy-type }
& anyAttribute
& element xcon:subtype { text }?
& anyElement*
# DECISION TYPE
decision-type =
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xsd:string "automatic"
| xsd:string "moderator-controlled"
| free-text-extension
# POLICY TYPE
policy-type =
xsd:string "allowed" | xsd:string "disallowed" | free-text-extension
# CONTROL TYPE
control-type =
anyAttribute
& element xcon:mute { xsd:boolean }?
& element xcon:pause-video { xsd:boolean }?
& element xcon:gain { gain-type }?
& element xcon:video-layout { video-layout-type }?
& anyElement*
# GAIN TYPE
gain-type = xsd:int { minInclusive = "-127" maxInclusive = "127" }
# VIDEO LAYOUT TYPE
video-layout-type =
xsd:string "single-view"
| xsd:string "dual-view"
| xsd:string "dual-view-crop"
| xsd:string "dual-view-2x1"
| xsd:string "dual-view-2x1-crop"
| xsd:string "quad-view"
| xsd:string "multiple-3x3"
| xsd:string "multiple-4x4"
| xsd:string "multiple-5x1"
| xsd:string "automatic"
| free-text-extension
# FLOOR INFORMATION TYPE
floor-information-type =
anyAttribute
& element xcon:conference-ID { xsd:unsignedLong }?
& element xcon:allow-floor-events { xsd:boolean }?
& element xcon:floor-request-handling { floor-request-type }?
& element xcon:conference-floor-policy { conference-floor-policy }?
& anyElement*
# FLOOR REQUEST TYPE
floor-request-type =
xsd:string "block" | xsd:string "confirm" | free-text-extension
# CONFERENCE FLOOR POLICY
conference-floor-policy =
anyAttribute
& element xcon:floor {
attribute id { text }
& anyAttribute
& element xcon:media-label { xsd:nonNegativeInteger }+
& element xcon:algorithm { algorithm-type }?
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& element xcon:max-floor-users { xsd:nonNegativeInteger }?
& element xcon:moderator-id { xsd:nonNegativeInteger }?
& anyElement*
}+
# ALGORITHM POLICY
algorithm-type =
xsd:string "moderator-controlled"
| xsd:string "FCFS"
| xsd:string "random"
| free-text-extension
# USERS ADMISSION POLICY
user-admission-policy-type =
xsd:string "closedAuthenticated"
| xsd:string "openAuthenticated"
| xsd:string "anonymous"
| free-text-extension
# JOIN HANDLING TYPE
join-handling-type =
xsd:string "block"
| xsd:string "confirm"
| xsd:string "allow"
| xsd:string "authenticate"
| xsd:string "directed-operator"
| free-text-extension
# DENY USERLIST
deny-user-list-type =
anyAttribute
& element xcon:target {
attribute uri { xsd:anyURI },
anyAttribute
}*
& anyElement*
# ALLOWED USERS LIST TYPE
allowed-users-list-type =
anyAttribute
& element xcon:target { target-type }*
& element xcon:persistent-list { persistent-list-type }?
& anyElement*
# PERSISTENT LIST TYPE
persistent-list-type =
element xcon:user {
attribute name { text }
& attribute nickname { text }
& attribute id { text }
& anyAttribute
& element xcon:e-mail { text }*
& anyElement*
}*
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& anyElement*
# TARGET TYPE
target-type =
attribute uri { xsd:anyURI },
attribute method { method-type },
anyAttribute
# METHOD TYPE
method-type =
xsd:string "dial-in"
| xsd:string "dial-out"
| xsd:string "refer"
| free-text-extension
# ANONYMITY TYPE
provide-anonymity-type =
"private" | "semi-private" | "hidden" | free-text-extension
# MIXER TYPE
mixer-type =
attribute name { mixer-name-type }
& anyAttribute
& element xcon:controls { control-type }*
& element xcon:floor {
attribute id { text },
anyAttribute,
xsd:boolean
}*
& anyElement*
# MIXER NAME TYPE
mixer-name-type =
"VideoIn" | "VideoOut" | "AudioOut" | "AudioIn" | free-text-extension
# FREE TEXT EXTENSION
#
free-text-extension = text
# *********************************
# EXTENSIBILITY OF THE SCHEMA
# *********************************
# EXTENSIBILITY ELEMENTS
#
anyElement =
element * - (conference-description
| host-info
| conference-state
| users
| sidebars-by-ref
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| sidebars-by-val
| display-text
| subject
| free-text
| keywords
| conf-uris
| service-uris
| maximum-user-count
| available-media
| web-page
| uris
| uri
| user-count
| active
| locked
| entry
| type
| status
| purpose
| modified
| user
| associated-aors
| roles
| languages
| cascaded-focus
| endpoint
| referred
| joining-method
| joining-info
| disconnection-method
| disconnection-info
| media
| call-info
| when
| reason
| by
| sip
| call-id
| from-tag
| to-tag
| label
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| src-id
| xcon:conference-password
| xcon:mixing-mode
| xcon:codecs
| xcon:controls
| xcon:language
| xcon:allow-sidebars
| xcon:cloning-parent
| xcon:sidebar-parent
| xcon:allow-conference-event-subscription
| xcon:to-mixer
| xcon:provide-anonymity
| xcon:allow-refer-users-dynamically
| xcon:allow-invite-users-dynamically
| xcon:allow-remove-users-dynamically
| xcon:from-mixer
| xcon:join-handling
| xcon:user-admission-policy
| xcon:allowed-users-list
| xcon:deny-users-list
| xcon:floor-information
| xcon:conference-time
| xcon:provide-anonymity
| xcon:floor
| xcon:entry
| xcon:mixing-start-offset
| xcon:mixing-end-offset
| xcon:can-join-after-offset
| xcon:must-join-before-offset
| xcon:request-user
| xcon:notify-end-of-conference
| xcon:allowed-extend-mixing-end-offset
| xcon:codec
| xcon:subtype
| xcon:mute
| xcon:pause-video
| xcon:gain
| xcon:video-layout
| xcon:conference-ID
| xcon:allow-floor-events
| xcon:floor-request-handling
| xcon:conference-floor-policy
| xcon:media-label
| xcon:algorithm
| xcon:max-floor-users
| xcon:moderator-id
| xcon:target
| xcon:persistent-list
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| xcon:e-mail
| xcon:user) { anyExtension }
anyExtension =
(attribute * { text }
| any)*
any =
element * {
(attribute * { text }
| text
| any)*
}
# EXTENSIBILITY ATTRIBUTES
#
anyAttribute =
attribute * - (xml:lang
| entity
| required-participant
| label
| decision
| name
| policy
| uri
| method
| id
| nickname) { text }*
6. XML Schema Extensibility
The conference information data model defined in this document is
meant to be extensible. Extensions are accomplished by defining
elements or attributes qualified by namespaces other than
"urn:ietf:params:xml:ns:conference-info" and
"urn:ietf:params:xml:ns:xcon-conference-info" for use wherever the
schema allows such extensions (i.e., where the RELAX NG definition
specifies "anyAttribute" or "anyElement").
Elements or attributes from unknown namespaces MUST be ignored.
7. XML Example
The following is an example of a conference information document.
The conference starts on October 17, 2007, at 10:30 a.m. in New York
City and finishes the same day at 12:30 p.m. every week and repeats
every week. In this example, there are currently three participants
in the conference: one administrator, one moderator, and one
participant. Sidebars are allowed in this conference and,
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RFC 6501 Data Model Schema March 2012
consequently, there is one sidebar in the conference. In addition,
Alice and Carol are using a floor in the main conference to manage
the audio and video resources. At the moment, Alice is assigned to
use the floor.
<?xml version="1.0" encoding="UTF-8"?>
<conference-info
xmlns="urn:ietf:params:xml:ns:conference-info"
xmlns:xcon="urn:ietf:params:xml:ns:xcon-conference-info"
entity="conference123@example.com">
<!--
CONFERENCE DESCRIPTION
-->
<conference-description xml:lang="en-us">
<display-text>Discussion of Formula-1 racing</display-text>
<subject>Sports:Formula-1</subject>
<free-text>This is a conference example</free-text>
<keywords>Formula-1 cars</keywords>
<!--
CONFERENCE UNIQUE IDENTIFIERS
-->
<conf-uris>
<entry>
<uri>tel:+3585671234</uri>
<display-text>Conference Bridge</display-text>
<purpose>participation</purpose>
<xcon:conference-password
>5678</xcon:conference-password>
</entry>
<entry>
<uri>http://www.example.com/live.ram</uri>
<purpose>streaming</purpose>
</entry>
</conf-uris>
<!--
SERVICE URIS
-->
<service-uris>
<entry>
<uri>mailto:bob@example.com</uri>
<display-text>email</display-text>
</entry>
</service-uris>
<!--
MAXIMUM USER COUNT
-->
<maximum-user-count>50</maximum-user-count>
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<!--
AVAILABLE MEDIA
-->
<available-media>
<entry label="10234">
<display-text>main audio</display-text>
<type>audio</type>
<status>sendrecv</status>
<xcon:mixing-mode>automatic</xcon:mixing-mode>
<xcon:codecs decision="automatic">
<xcon:codec name="122" policy="allowed">
<xcon:subtype>PCMU</xcon:subtype>
</xcon:codec>
</xcon:codecs>
<xcon:controls>
<xcon:mute>true</xcon:mute>
<xcon:gain>50</xcon:gain>
</xcon:controls>
</entry>
<entry label="10235">
<display-text>main video</display-text>
<type>video</type>
<status>sendrecv</status>
<xcon:mixing-mode>automatic</xcon:mixing-mode>
<xcon:codecs decision="automatic">
<xcon:codec name="123" policy="allowed">
<xcon:subtype>H.263</xcon:subtype>
</xcon:codec>
</xcon:codecs>
<xcon:controls>
<xcon:video-layout
>single-view</xcon:video-layout>
</xcon:controls>
</entry>
</available-media>
<xcon:language>En-us</xcon:language>
<xcon:allow-sidebars>true</xcon:allow-sidebars>
<!--
CONFERENCE TIME
-->
<xcon:conference-time>
<xcon:entry>
<xcon:base>BEGIN:VCALENDAR
PRODID:-//LlamaSpinner Inc.//NONSGML CamelCall//EN
VERSION:2.0
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RFC 6501 Data Model Schema March 2012
BEGIN:VEVENT
DTSTAMP:20071003T140728Z
UID:20071003T140728Z-345FDA-carol@example.com
ORGANIZER:MAILTO:carol@example.com
DTSTART:20071017T143000Z
RRULE:FREQ=WEEKLY
DTEND:20071217T163000Z
END:VEVENT
END:VCALENDAR</xcon:base>
<xcon:mixing-start-offset
required-participant="moderator"
>2007-10-17T14:29:00Z</xcon:mixing-start-offset>
<xcon:mixing-end-offset
required-participant="participant"
>2007-10-17T16:31:00Z</xcon:mixing-end-offset>
<xcon:must-join-before-offset
>2007-10-17T15:30:00Z
</xcon:must-join-before-offset>
</xcon:entry>
</xcon:conference-time>
</conference-description>
<!--
HOST INFO
-->
<host-info>
<display-text>Formula1</display-text>
<web-page>http://www.example.com/formula1/</web-page>
<uris>
<entry>
<uri>sip:alice@example.com</uri>
</entry>
<entry>
<uri>sip:carol@example.com</uri>
</entry>
</uris>
</host-info>
<!--
CONFERENCE STATE
-->
<conference-state>
<user-count>3</user-count>
<active>true</active>
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<locked>false</locked>
<xcon:allow-conference-event-subscription
>true</xcon:allow-conference-event-subscription>
</conference-state>
<!--
USERS
-->
<users>
<!--
USER BOB
-->
<user entity="xcon-userid:bob534">
<display-text>Bob Hoskins</display-text>
<associated-aors>
<entry>
<uri>mailto:bob@example.com</uri>
<display-text>email</display-text>
</entry>
</associated-aors>
<roles>
<entry>participant</entry>
</roles>
<languages>en-us</languages>
<!--
ENDPOINTS
-->
<endpoint entity="sip:bob@example.com">
<display-text>Bob's Laptop</display-text>
<referred>
<when>2007-10-17T14:00:00Z</when>
<reason>expert required</reason>
<by>sip:alice@example.com</by>
</referred>
<status>connected</status>
<joining-method>dialed-out</joining-method>
<joining-info>
<when>2007-10-17T14:00:00Z</when>
<reason>invitation</reason>
<by>sip:alice@example.com</by>
</joining-info>
<!--
MEDIA
-->
<media id="1">
<type>video</type>
<label>10235</label>
Novo, et al. Standards Track [Page 43]
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<src-id>432424</src-id>
<status>sendrecv</status>
<xcon:to-mixer name="VideoIn">
<xcon:controls>
<xcon:video-layout
>single-view</xcon:video-layout>
</xcon:controls>
</xcon:to-mixer>
</media>
<!--
CALL INFO
-->
<call-info>
<sip>
<display-text>full info</display-text>
<call-id>hsjh8980vhsb78</call-id>
<from-tag>vav738dvbs</from-tag>
<to-tag>8954jgjg8432</to-tag>
</sip>
</call-info>
</endpoint>
<xcon:provide-anonymity
>semi-private</xcon:provide-anonymity>
<xcon:allow-refer-users-dynamically
>false</xcon:allow-refer-users-dynamically>
<xcon:allow-invite-users-dynamically
>false</xcon:allow-invite-users-dynamically>
<xcon:allow-remove-users-dynamically
>false</xcon:allow-remove-users-dynamically>
</user>
<!--
USER ALICE
-->
<user entity="xcon-userid:alice334">
<display-text>Alice Kay</display-text>
<associated-aors>
<entry>
<uri>mailto:alice@example.com</uri>
<display-text>email</display-text>
</entry>
</associated-aors>
<roles>
<entry>moderator</entry>
</roles>
<languages>en-us</languages>
<!--
ENDPOINTS
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-->
<endpoint entity="sip:alice@example.com">
<display-text>Alice's Desktop</display-text>
<status>connected</status>
<joining-method>dialed-in</joining-method>
<joining-info>
<when>2007-10-17T13:35:08Z</when>
<reason>invitation</reason>
<by>sip:conference@example.com</by>
</joining-info>
<!--
MEDIA
-->
<media id="1">
<type>video</type>
<label>10235</label>
<src-id>432424</src-id>
<status>sendrecv</status>
<xcon:to-mixer name="VideoIn">
<xcon:controls>
<xcon:video-layout
>single-view</xcon:video-layout>
</xcon:controls>
</xcon:to-mixer>
</media>
<media id="2">
<type>audio</type>
<label>10234</label>
<src-id>532535</src-id>
<status>sendrecv</status>
<xcon:to-mixer name="AudioIn">
<xcon:controls>
<xcon:gain>50</xcon:gain>
</xcon:controls>
</xcon:to-mixer>
<xcon:from-mixer name="AudioOut">
<xcon:controls>
<xcon:gain>50</xcon:gain>
</xcon:controls>
</xcon:from-mixer>
</media>
<!--
CALL INFO
-->
<call-info>
<sip>
<display-text>full info</display-text>
<call-id>truy45469123478</call-id>
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RFC 6501 Data Model Schema March 2012
<from-tag>asd456cbgt</from-tag>
<to-tag>3456jgjg1234</to-tag>
</sip>
</call-info>
<xcon:floor id="345">true</xcon:floor>
</endpoint>
<xcon:provide-anonymity>private</xcon:provide-anonymity>
<xcon:allow-refer-users-dynamically
>true</xcon:allow-refer-users-dynamically>
<xcon:allow-invite-users-dynamically
>true</xcon:allow-invite-users-dynamically>
<xcon:allow-remove-users-dynamically
>true</xcon:allow-remove-users-dynamically>
</user>
<!--
USER CAROL
-->
<user entity="xcon-userid:carol233">
<display-text>Carol More</display-text>
<associated-aors>
<entry>
<uri>mailto:carol@example.com</uri>
<display-text>email</display-text>
</entry>
</associated-aors>
<roles>
<entry>administrator</entry>
</roles>
<languages>en-us</languages>
<!--
ENDPOINTS
-->
<endpoint entity="sip:carol@example.com">
<display-text>Carol's Computer</display-text>
<status>connected</status>
<joining-method>dialed-in</joining-method>
<joining-info>
<when>2007-10-17T13:30:05Z</when>
<reason>invitation</reason>
<by>sip:conference@example.com</by>
</joining-info>
<!--
MEDIA
-->
<media id="1">
<type>video</type>
<label>10235</label>
Novo, et al. Standards Track [Page 46]
RFC 6501 Data Model Schema March 2012
<src-id>432424</src-id>
<status>sendrecv</status>
<xcon:to-mixer name="VideoIn">
<xcon:controls>
<xcon:video-layout
>single-view</xcon:video-layout>
</xcon:controls>
</xcon:to-mixer>
</media>
<media id="2">
<type>audio</type>
<label>10234</label>
<src-id>532535</src-id>
<status>sendrecv</status>
<xcon:to-mixer name="AudioIn">
<xcon:controls>
<xcon:gain>50</xcon:gain>
</xcon:controls>
</xcon:to-mixer>
<xcon:from-mixer name="AudioOut">
<xcon:controls>
<xcon:gain>50</xcon:gain>
</xcon:controls>
</xcon:from-mixer>
</media>
<!--
CALL INFO
-->
<call-info>
<sip>
<display-text>full info</display-text>
<call-id>wevb12562321894</call-id>
<from-tag>asw456wedf</from-tag>
<to-tag>2365dfrt3497</to-tag>
</sip>
</call-info>
<xcon:floor id="345">false</xcon:floor>
</endpoint>
<xcon:provide-anonymity>private</xcon:provide-anonymity>
<xcon:allow-refer-users-dynamically
>true</xcon:allow-refer-users-dynamically>
<xcon:allow-invite-users-dynamically
>true</xcon:allow-invite-users-dynamically>
<xcon:allow-remove-users-dynamically
>true</xcon:allow-remove-users-dynamically>
Novo, et al. Standards Track [Page 47]
RFC 6501 Data Model Schema March 2012
</user>
<xcon:join-handling>allow</xcon:join-handling>
<xcon:user-admission-policy
>openAuthenticated</xcon:user-admission-policy>
<!--
ALLOWED USERS LIST
-->
<xcon:allowed-users-list>
<xcon:target uri="sip:bob@example.com"
method="dial-out"/>
<xcon:target uri="sip:alice@example.com"
method="dial-out"/>
<xcon:target uri="sip:carol@example.com"
method="dial-out"/>
<xcon:target uri="sip:john@example.com"
method="refer"/>
</xcon:allowed-users-list>
<!--
DENY USERS LIST
-->
<xcon:deny-users-list>
<xcon:target uri="sip:charlie@example.com"/>
</xcon:deny-users-list>
</users>
<!--
SIDEBARS BY REFERENCE
-->
<sidebars-by-ref>
<entry>
<uri>xcon:conf223</uri>
<display-text>private with Bob</display-text>
</entry>
</sidebars-by-ref>
<!--
SIDEBARS BY VALUE
-->
<sidebars-by-val>
<entry entity="conf223">
<users>
<user entity="xcon-userid:bob534"/>
<user entity="xcon-userid:carol233"/>
</users>
</entry>
</sidebars-by-val>
<!--
FLOOR INFORMATION
-->
Novo, et al. Standards Track [Page 48]
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<xcon:floor-information>
<xcon:conference-ID>567</xcon:conference-ID>
<xcon:allow-floor-events>true</xcon:allow-floor-events>
<xcon:floor-request-handling
>confirm</xcon:floor-request-handling>
<xcon:conference-floor-policy>
<xcon:floor id="345">
<xcon:media-label>10234</xcon:media-label>
<xcon:media-label>10235</xcon:media-label>
<xcon:algorithm
>moderator-controlled</xcon:algorithm>
<xcon:max-floor-users>1</xcon:max-floor-users>
<xcon:moderator-id>234</xcon:moderator-id>
</xcon:floor>
</xcon:conference-floor-policy>
</xcon:floor-information>
</conference-info>
Note that due to RFC formatting conventions, this documents splits
lines whose content would exceed 72 characters.
8. Security Considerations
There are numerous security considerations for this document.
Overall, the security considerations for authentication and the
Security and Privacy of Identity described in Sections 11 and 11.2,
respectively, of the centralized conferencing framework document
[RFC5239] apply to this document.
This specification defines a data model for conference objects.
Different conferencing systems may use different protocols to provide
access to these conference objects. This section contains general
security considerations for the conference objects and for the
protocols. The specification of each particular protocol needs to
discuss how the specific protocol meets the security requirements
provided in this section.
A given conferencing system usually supports different protocols in
order to implement different functions (e.g., SIP for session control
and BFCP for floor control). Each of these protocols may use its own
authentication mechanism. In cases where a user is authenticated
using multiple authentication mechanisms, it is up to the
conferencing system to map all the different authentications to the
same user. Discussing the specifics of different authentication
mechanism is beyond the scope of this document.
Novo, et al. Standards Track [Page 49]
RFC 6501 Data Model Schema March 2012
Furthermore, users may use different identifiers to access a
conference, as explained in Section 4.6.5. These different
namespaces can be associated with a unique conference user identifier
(XCON-USERID). A mapping database is used to map all these
authenticated user namespaces to the XCON-USERID. There are several
threats against this database. In order to minimize these threats,
the administrator of the conferencing system MUST ensure that only
authorized users can connect to this database (e.g., by using access
control rules). In particular, the integrity of the database MUST be
protected against unauthorized modifications. In addition, the XCON-
USERID or XCON-URI SHOULD be hard to guess. It is critical that the
URI remain difficult to "guess" via brute force methods. Generic
security considerations for usage of URIs are discussed in [RFC3986].
It is RECOMMENDED that the database uses encryption mechanisms if the
information is stored in long-term storage (e.g., disk). If the
database contains sensitive elements (e.g., passwords), the
confidentiality of the database MUST be protected from unauthorized
users. If no sensitive elements are present, then confidentiality is
not needed. In addition to implementing access control, as discussed
above, it is RECOMMENDED that administrators of conferencing systems
only provide access to the database over encrypted channels (e.g.,
using TLS encryption) in order to avoid eavesdroppers.
Administrators of conferencing systems SHOULD also avoid disclosing
information to unauthorized parties when a conference is being cloned
or when a sidebar is being created. For example, an external sidebar
as defined in [RFC5239], Section 9.4.2, may include participants who
were not authorized for the parent conference.
The security considerations for authentication described in Section
11.1 of the centralized conferencing framework document [RFC5239]
also apply to this document. Similarly, the security considerations
for authorization described in Section 5.2 of the Session Initiation
Protocol (SIP) REFER Method [RFC3515] apply to this document as well.
Note that the specification of the privacy policy is outside the
scope of this document. Saying that, a privacy policy will be needed
in the real implementation of the data model and, therefore, is
subject to future policy documents.
Novo, et al. Standards Track [Page 50]
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9. IANA Considerations
9.1. RELAX NG Schema Registration
This specification registers a schema. The schema can be found
as the sole content of Section 5.
URI: urn:ietf:params:xml:schema:xcon-conference-info
Registrant Contact: IETF XCON working group <xcon@ietf.org>,
Oscar Novo <Oscar.Novo@ericsson.com>
RELAX NG Schema: The RELAX NG schema to be registered is contained
in Section 5. Its first line is as follows:
default namespace = "urn:ietf:params:xml:ns:conference-info"
and its last line is as follows:
anyAttribute = attribute * - (xml:lang | entity
| required-participant | label | decision | name
| policy | uri | method | id | nickname) { text }*
Novo, et al. Standards Track [Page 51]
RFC 6501 Data Model Schema March 2012
9.2. XML Namespace Registration
This section registers a new XML namespace.
URI: urn:ietf:params:xml:ns:xcon-conference-info
Registrant Contact: IETF XCON working group <xcon@ietf.org>,
Oscar Novo <Oscar.Novo@ericsson.com>
XML:
BEGIN
<?xml version="1.0"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML Basic 1.0//EN"
"http://www.w3.org/TR/xhtml-basic/xhtml-basic10.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type"
content="text/html;charset=iso-8859-1"/>
<title> Centralized Conferencing Namespace</title>
</head>
<body>
<h1>Namespace for Centralized Conferencing</h1>
<h2>urn:ietf:params:xml:ns:xcon-conference-info</h2>
<p>See <a href="http://www.rfc-editor.org/rfc/rfc6501.txt">
RFC 6501</a>.</p>
</body>
</html>
END
9.3. Conference Object Identifier Registration
URI scheme name: xcon
Status: permanent
URI scheme syntax: see Section 3.3.1.
URI schema semantics: see Section 3.3
Encoding considerations: see Section 8
Intended usage: see Section 3.3
Applications and/or protocols that use this URI scheme name:
Centralized Conferencing systems
Interoperability considerations: none
Security considerations: see Section 8
Relevant publications: conference information data model for
Centralized Conferencing (XCON)
Contact: Oscar Novo <oscar.novo@ericsson.com>
Author/Change controller: Oscar Novo <oscar.novo@ericsson.com>
Novo, et al. Standards Track [Page 52]
RFC 6501 Data Model Schema March 2012
9.4. Conference User Identifier Registration
URI scheme name: XCON-USERID
Status: permanent
URI scheme syntax: see Section 4.6.5
URI schema semantics: see Section 4.6.5
Encoding considerations: see Section 8
Intended usage: see Section 4.6.3 and 4.6.5
Applications and/or protocols that use this URI scheme name:
Centralized Conferencing systems.
Interoperability considerations: none
Security considerations: see Section 8
Relevant publications: conference information data model for
Centralized Conferencing (XCON)
Contact: Oscar Novo <oscar.novo@ericsson.com>
Author/Change controller: Oscar Novo <oscar.novo@ericsson.com>
10. Acknowledgements
This document is really a distillation of many ideas discussed over a
long period of time. These ideas were contributed by many different
documents in the XCON working group and the SIPPING working group.
We would like to thank Orit Levin, Roni Even, Adam Roach, Mary
Barnes, Chris Boulton, Umesh Chandra, Hisham Khartabil, Petri
Koskelainen, Aki Niemi, Rohan Mahy, Jonathan Lennox, Sean Duddy,
Richard Barnes, and Henning Schulzrinne for their comments. Also, we
would like to thank Mary Barnes and Chris Boulton for letting us use
the conference and user identifier information of their XCON
documents. Last but not least, we would like to express our
gratitude to all those reviewers for their invaluable contributions:
Simon Pietro Romano, Lorenzo Miniero, Tobia Castaldi, Miguel Garcia,
Mary Barnes, Srivatsa Srinivasan, Avshalom Houri, Pierre Tane, and
Ben Campbell.
11. References
11.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC3986] Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform
Resource Identifier (URI): Generic Syntax", STD 66,
RFC 3986, January 2005.
Novo, et al. Standards Track [Page 53]
RFC 6501 Data Model Schema March 2012
[RFC4575] Rosenberg, J., Schulzrinne, H., and O. Levin, "A Session
Initiation Protocol (SIP) Event Package for Conference
State", RFC 4575, August 2006.
[RFC4582] Camarillo, G., Ott, J., and K. Drage, "The Binary Floor
Control Protocol (BFCP)", RFC 4582, November 2006.
[RFC4583] Camarillo, G., "Session Description Protocol (SDP) Format
for Binary Floor Control Protocol (BFCP) Streams",
RFC 4583, November 2006.
[RFC5234] Crocker, D. and P. Overell, "Augmented BNF for Syntax
Specifications: ABNF", STD 68, RFC 5234, January 2008.
[RFC5239] Barnes, M., Boulton, C., and O. Levin, "A Framework for
Centralized Conferencing", RFC 5239, June 2008.
[RFC5545] Desruisseaux, B., "Internet Calendaring and Scheduling
Core Object Specification (iCalendar)", RFC 5545,
September 2009.
11.2. Informative References
[IANA] IANA, "RTP Payload Types",
<http://www.iana.org/assignments/rtp-parameters>.
[IANA-Lan] IANA, "Language Subtag Registry",
<http://www.iana.org/assignments/
language-subtag-registry>.
[RELAX] "RELAX NG Home Page", ISO/IEC 19757-2:2008.
[RFC3264] Rosenberg, J. and H. Schulzrinne, "An Offer/Answer Model
with Session Description Protocol (SDP)", RFC 3264,
June 2002.
[RFC3515] Sparks, R., "The Session Initiation Protocol (SIP) Refer
Method", RFC 3515, April 2003.
[RFC4353] Rosenberg, J., "A Framework for Conferencing with the
Session Initiation Protocol (SIP)", RFC 4353,
February 2006.
[RFC4855] Casner, S., "Media Type Registration of RTP Payload
Formats", RFC 4855, February 2007.
Novo, et al. Standards Track [Page 54]
RFC 6501 Data Model Schema March 2012
[RFC5018] Camarillo, G., "Connection Establishment in the Binary
Floor Control Protocol (BFCP)", RFC 5018, September 2007.
[RFC5646] Phillips, A. and M. Davis, "Tags for Identifying
Languages", BCP 47, RFC 5646, September 2009.
[W3C.REC-xml-20081126]
Bray, T., Paoli, J., Sperberg-McQueen, C., Maler, E., and
F. Yergeau, "Extensible Markup Language (XML) 1.0 (Fifth
Edition)", World Wide Web Consortium Recommendation REC-
xml-20081126, November 2008,
<http://www.w3.org/TR/2008/REC-xml-20081126>.
Novo, et al. Standards Track [Page 55]
RFC 6501 Data Model Schema March 2012
Appendix A. Non-Normative RELAX NG Schema in XML Syntax
<?xml version="1.0" encoding="UTF-8" ?>
<grammar
ns="urn:ietf:params:xml:ns:conference-info"
xmlns="http://relaxng.org/ns/structure/1.0"
xmlns:xcon="urn:ietf:params:xml:ns:xcon-conference-info"
datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">
<start>
<element name="conference-info">
<ref name="conference-type"/>
</element>
</start>
<!--
CONFERENCE TYPE
-->
<define name="conference-type">
<interleave>
<attribute name="entity">
<text/>
</attribute>
<ref name="anyAttribute"/>
<optional>
<ref name="conference-description-type"/>
</optional>
<optional>
<element name="host-info">
<ref name="host-type"/>
</element>
</optional>
<optional>
<element name="conference-state">
<ref name="conference-state-type"/>
</element>
</optional>
<optional>
<element name="users">
<ref name="users-type"/>
</element>
</optional>
<optional>
<element name="sidebars-by-ref">
<ref name="uris-type"/>
</element>
</optional>
<optional>
<element name="sidebars-by-val">
Novo, et al. Standards Track [Page 56]
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<ref name="sidebars-by-val-type"/>
</element>
</optional>
<optional>
<element name="xcon:floor-information">
<ref name="floor-information-type"/>
</element>
</optional>
<zeroOrMore>
<ref name="anyElement"/>
</zeroOrMore>
</interleave>
</define>
<!--
CONFERENCE DESCRIPTION TYPE
-->
<define name="conference-description-type">
<element name="conference-description">
<interleave>
<optional>
<attribute name="xml:lang">
<data type="language"/>
</attribute>
</optional>
<ref name="anyAttribute"/>
<optional>
<element name="display-text">
<text/>
</element>
</optional>
<optional>
<element name="subject">
<text/>
</element>
</optional>
<optional>
<element name="free-text">
<text/>
</element>
</optional>
<optional>
<element name="keywords">
<list>
<zeroOrMore>
<data type="string"/>
</zeroOrMore>
</list>
</element>
Novo, et al. Standards Track [Page 57]
RFC 6501 Data Model Schema March 2012
</optional>
<optional>
<element name="conf-uris">
<ref name="uris-type"/>
</element>
</optional>
<optional>
<element name="service-uris">
<ref name="uris-type"/>
</element>
</optional>
<optional>
<element name="maximum-user-count">
<data type="int"/>
</element>
</optional>
<optional>
<element name="available-media">
<ref name="conference-media-type"/>
</element>
</optional>
<optional>
<element name="xcon:language">
<data type="language"/>
</element>
</optional>
<optional>
<element name="xcon:allow-sidebars">
<data type="boolean"/>
</element>
</optional>
<optional>
<element name="xcon:cloning-parent">
<data type="anyURI"/>
</element>
</optional>
<optional>
<element name="xcon:sidebar-parent">
<data type="anyURI"/>
</element>
</optional>
<optional>
<element name="xcon:conference-time">
<ref name="conferencetime-type"/>
</element>
</optional>
<zeroOrMore>
<ref name="anyElement"/>
Novo, et al. Standards Track [Page 58]
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</zeroOrMore>
</interleave>
</element>
</define>
<!--
HOST TYPE
-->
<define name="host-type">
<interleave>
<optional>
<element name="display-text">
<text/>
</element>
</optional>
<optional>
<element name="web-page">
<data type="anyURI"/>
</element>
</optional>
<optional>
<element name="uris">
<ref name="uris-type"/>
</element>
</optional>
<zeroOrMore>
<ref name="anyElement"/>
</zeroOrMore>
<ref name="anyAttribute"/>
</interleave>
</define>
<!--
CONFERENCE STATE TYPE
-->
<define name="conference-state-type">
<interleave>
<ref name="anyAttribute"/>
<optional>
<element name="user-count">
<data type="unsignedInt"/>
</element>
</optional>
<optional>
<element name="active">
<data type="boolean"/>
</element>
</optional>
<optional>
<element name="locked">
Novo, et al. Standards Track [Page 59]
RFC 6501 Data Model Schema March 2012
<data type="boolean"/>
</element>
</optional>
<optional>
<element name="xcon:allow-conference-event-subscription">
<data type="boolean"/>
</element>
</optional>
<zeroOrMore>
<ref name="anyElement"/>
</zeroOrMore>
</interleave>
</define>
<!--
CONFERENCE MEDIA TYPE
-->
<define name="conference-media-type">
<interleave>
<ref name="anyAttribute"/>
<zeroOrMore>
<element name="entry">
<ref name="conference-medium-type"/>
</element>
</zeroOrMore>
<zeroOrMore>
<ref name="anyElement"/>
</zeroOrMore>
</interleave>
</define>
<!--
CONFERENCE MEDIUM TYPE
-->
<define name="conference-medium-type">
<interleave>
<attribute name="label">
<text/>
</attribute>
<ref name="anyAttribute"/>
<optional>
<element name="display-text">
<text/>
</element>
</optional>
<optional>
<element name="type">
<text/>
</element>
</optional>
Novo, et al. Standards Track [Page 60]
RFC 6501 Data Model Schema March 2012
<optional>
<element name="status">
<ref name="media-status-type"/>
</element>
</optional>
<optional>
<element name="xcon:mixing-mode">
<ref name="mixing-mode-type"/>
</element>
</optional>
<optional>
<element name="xcon:codecs">
<ref name="codecs-type"/>
</element>
</optional>
<optional>
<element name="xcon:controls">
<ref name="control-type"/>
</element>
</optional>
<zeroOrMore>
<ref name="anyElement"/>
</zeroOrMore>
</interleave>
</define>
<!--
URIs TYPE
-->
<define name="uris-type">
<interleave>
<ref name="anyAttribute"/>
<zeroOrMore>
<element name="entry">
<ref name="uri-type"/>
</element>
</zeroOrMore>
<zeroOrMore>
<ref name="anyElement"/>
</zeroOrMore>
</interleave>
</define>
<!--
URI TYPE
-->
<define name="uri-type">
<interleave>
<element name="uri">
<data type="anyURI"/>
Novo, et al. Standards Track [Page 61]
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</element>
<optional>
<element name="display-text">
<text/>
</element>
</optional>
<optional>
<element name="purpose">
<text/>
</element>
</optional>
<optional>
<element name="modified">
<ref name="execution-type"/>
</element>
</optional>
<zeroOrMore>
<element name="xcon:conference-password">
<text/>
</element>
</zeroOrMore>
<zeroOrMore>
<ref name="anyElement"/>
</zeroOrMore>
<ref name="anyAttribute"/>
</interleave>
</define>
<!--
USERS TYPE
-->
<define name="users-type">
<interleave>
<ref name="anyAttribute"/>
<zeroOrMore>
<element name="user">
<ref name="user-type"/>
</element>
</zeroOrMore>
<optional>
<element name="xcon:join-handling">
<ref name="join-handling-type"/>
</element>
</optional>
<optional>
<element name="xcon:user-admission-policy">
<ref name="user-admission-policy-type"/>
</element>
Novo, et al. Standards Track [Page 62]
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</optional>
<optional>
<element name="xcon:allowed-users-list">
<ref name="allowed-users-list-type"/>
</element>
</optional>
<optional>
<element name="xcon:deny-users-list">
<ref name="deny-user-list-type"/>
</element>
</optional>
<zeroOrMore>
<ref name="anyElement"/>
</zeroOrMore>
</interleave>
</define>
<!--
USER TYPE
-->
<define name="user-type">
<interleave>
<attribute name="entity">
<data type="anyURI"/>
</attribute>
<ref name="anyAttribute"/>
<optional>
<element name="display-text">
<text/>
</element>
</optional>
<optional>
<element name="associated-aors">
<ref name="uris-type"/>
</element>
</optional>
<optional>
<element name="roles">
<oneOrMore>
<element name="entry">
<ref name="single-role-type"/>
</element>
</oneOrMore>
</element>
</optional>
<optional>
<element name="languages">
<list>
<data type="language"/>
Novo, et al. Standards Track [Page 63]
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</list>
</element>
</optional>
<optional>
<element name="cascaded-focus">
<data type="anyURI"/>
</element>
</optional>
<zeroOrMore>
<element name="endpoint">
<ref name="endpoint-type"/>
</element>
</zeroOrMore>
<optional>
<element name="xcon:provide-anonymity">
<ref name="provide-anonymity-type"/>
</element>
</optional>
<optional>
<element name="xcon:allow-refer-users-dynamically">
<data type="boolean"/>
</element>
</optional>
<optional>
<element name="xcon:allow-invite-users-dynamically">
<data type="boolean"/>
</element>
</optional>
<optional>
<element name="xcon:allow-remove-users-dynamically">
<data type="boolean"/>
</element>
</optional>
<zeroOrMore>
<ref name="anyElement"/>
</zeroOrMore>
</interleave>
</define>
<!--
ENDPOINT TYPE
-->
<define name="endpoint-type">
<interleave>
<attribute name="entity">
<text/>
</attribute>
<ref name="anyAttribute"/>
<optional>
Novo, et al. Standards Track [Page 64]
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<element name="display-text">
<text/>
</element>
</optional>
<optional>
<element name="referred">
<ref name="execution-type"/>
</element>
</optional>
<optional>
<element name="status">
<ref name="endpoint-status-type"/>
</element>
</optional>
<optional>
<element name="joining-method">
<ref name="joining-type"/>
</element>
</optional>
<optional>
<element name="joining-info">
<ref name="execution-type"/>
</element>
</optional>
<optional>
<element name="disconnection-method">
<ref name="disconnection-type"/>
</element>
</optional>
<optional>
<element name="disconnection-info">
<ref name="execution-type"/>
</element>
</optional>
<zeroOrMore>
<element name="media">
<ref name="media-type"/>
</element>
</zeroOrMore>
<optional>
<element name="call-info">
<ref name="call-type"/>
</element>
</optional>
<zeroOrMore>
<ref name="anyElement"/>
</zeroOrMore>
</interleave>
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</define>
<!--
ENDPOINT STATUS TYPE
-->
<define name="endpoint-status-type">
<choice>
<value>pending</value>
<value>dialing-out</value>
<value>dialing-in</value>
<value>alerting</value>
<value>on-hold</value>
<value>connected</value>
<value>muted-via-focus</value>
<value>disconnecting</value>
<value>disconnected</value>
<ref name="free-text-extension"/>
</choice>
</define>
<!--
JOINING TYPE
-->
<define name="joining-type">
<choice>
<value>dialed-in</value>
<value>dialed-out</value>
<value>focus-owner</value>
<ref name="free-text-extension"/>
</choice>
</define>
<!--
DISCONNECTION TYPE
-->
<define name="disconnection-type">
<choice>
<value>departed</value>
<value>booted</value>
<value>failed</value>
<value>busy</value>
<ref name="free-text-extension"/>
</choice>
</define>
<!--
EXECUTION TYPE
-->
<define name="execution-type">
<interleave>
<optional>
<element name="when">
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<data type="dateTime"/>
</element>
</optional>
<optional>
<element name="reason">
<text/>
</element>
</optional>
<optional>
<element name="by">
<data type="anyURI"/>
</element>
</optional>
<ref name="anyAttribute"/>
</interleave>
</define>
<!--
CALL TYPE
-->
<define name="call-type">
<interleave>
<element name="sip">
<ref name="sip-dialog-id-type"/>
</element>
<zeroOrMore>
<ref name="anyElement"/>
</zeroOrMore>
<ref name="anyAttribute"/>
</interleave>
</define>
<!--
SIP DIALOG ID TYPE
-->
<define name="sip-dialog-id-type">
<interleave>
<optional>
<element name="display-text">
<text/>
</element>
</optional>
<element name="call-id">
<text/>
</element>
<element name="from-tag">
<text/>
</element>
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<element name="to-tag">
<text/>
</element>
<zeroOrMore>
<ref name="anyElement"/>
</zeroOrMore>
<ref name="anyAttribute"/>
</interleave>
</define>
<!--
MEDIA TYPE
-->
<define name="media-type">
<interleave>
<attribute name="id">
<data type="int"/>
</attribute>
<ref name="anyAttribute"/>
<optional>
<element name="display-text">
<text/>
</element>
</optional>
<optional>
<element name="type">
<text/>
</element>
</optional>
<optional>
<element name="label">
<text/>
</element>
</optional>
<optional>
<element name="src-id">
<text/>
</element>
</optional>
<optional>
<element name="status">
<ref name="media-status-type"/>
</element>
</optional>
<optional>
<element name="xcon:to-mixer">
<ref name="mixer-type"/>
</element>
</optional>
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<optional>
<element name="xcon:from-mixer">
<ref name="mixer-type"/>
</element>
</optional>
<zeroOrMore>
<ref name="anyElement"/>
</zeroOrMore>
</interleave>
</define>
<!--
MEDIA STATUS TYPE
-->
<define name="media-status-type">
<choice>
<value>recvonly</value>
<value>sendonly</value>
<value>sendrecv</value>
<value>inactive</value>
<ref name="free-text-extension"/>
</choice>
</define>
<!--
SIDEBARS-BY-VAL TYPE
-->
<define name="sidebars-by-val-type">
<interleave>
<ref name="anyAttribute"/>
<zeroOrMore>
<element name="entry">
<ref name="conference-type"/>
</element>
</zeroOrMore>
<zeroOrMore>
<ref name="anyElement"/>
</zeroOrMore>
</interleave>
</define>
<!--
CONFERENCE TIME
-->
<define name="conferencetime-type">
<interleave>
<ref name="anyAttribute"/>
<zeroOrMore>
<element name="xcon:entry">
<element name="xcon:base">
<text/>
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</element>
<optional>
<element name="xcon:mixing-start-offset">
<ref name="time-type"/>
<attribute name="required-participant">
<ref name="single-role-type"/>
</attribute>
<ref name="anyAttribute"/>
</element>
</optional>
<optional>
<element name="xcon:mixing-end-offset">
<ref name="time-type"/>
<attribute name="required-participant">
<ref name="single-role-type"/>
</attribute>
<ref name="anyAttribute"/>
</element>
</optional>
<optional>
<element name="xcon:can-join-after-offset">
<ref name="time-type"/>
</element>
</optional>
<optional>
<element name="xcon:must-join-before-offset">
<ref name="time-type"/>
</element>
</optional>
<optional>
<element name="xcon:request-user">
<ref name="time-type"/>
</element>
</optional>
<optional>
<element name="xcon:notify-end-of-conference">
<data type="nonNegativeInteger"/>
</element>
</optional>
<optional>
<element name="xcon:allowed-extend-mixing-end-offset">
<data type="boolean"/>
</element>
</optional>
<zeroOrMore>
<ref name="anyElement"/>
</zeroOrMore>
</element>
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</zeroOrMore>
</interleave>
</define>
<!--
TIME TYPE
-->
<define name="time-type">
<data type="dateTime">
<param name="pattern">.+T.+Z.*</param>
</data>
</define>
<!--
SINGLE ROLE TYPE
-->
<define name="single-role-type">
<choice>
<value type="string">none</value>
<value type="string">administrator</value>
<value type="string">moderator</value>
<value type="string">user</value>
<value type="string">observer</value>
<value type="string">participant</value>
<ref name="free-text-extension"/>
</choice>
</define>
<!--
MIXING MODE TYPE
-->
<define name="mixing-mode-type">
<choice>
<value type="string">moderator-controlled</value>
<value type="string">FCFS</value>
<value type="string">automatic</value>
<ref name="free-text-extension"/>
</choice>
</define>
<!--
CODECS TYPE
-->
<define name="codecs-type">
<interleave>
<attribute name="decision">
<ref name="decision-type"/>
</attribute>
<ref name="anyAttribute"/>
<zeroOrMore>
<element name="xcon:codec">
<ref name="codec-type"/>
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</element>
</zeroOrMore>
<zeroOrMore>
<ref name="anyElement"/>
</zeroOrMore>
</interleave>
</define>
<!--
CODEC TYPE
-->
<define name="codec-type">
<interleave>
<attribute name="name">
<text/>
</attribute>
<attribute name="policy">
<ref name="policy-type"/>
</attribute>
<ref name="anyAttribute"/>
<optional>
<element name="xcon:subtype">
<text/>
</element>
</optional>
<zeroOrMore>
<ref name="anyElement"/>
</zeroOrMore>
</interleave>
</define>
<!--
DECISION TYPE
-->
<define name="decision-type">
<choice>
<value type="string">automatic</value>
<value type="string">moderator-controlled</value>
<ref name="free-text-extension"/>
</choice>
</define>
<!--
POLICY TYPE
-->
<define name="policy-type">
<choice>
<value type="string">allowed</value>
<value type="string">disallowed</value>
<ref name="free-text-extension"/>
</choice>
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</define>
<!--
CONTROL TYPE
-->
<define name="control-type">
<interleave>
<ref name="anyAttribute"/>
<optional>
<element name="xcon:mute">
<data type="boolean"/>
</element>
</optional>
<optional>
<element name="xcon:pause-video">
<data type="boolean"/>
</element>
</optional>
<optional>
<element name="xcon:gain">
<ref name="gain-type"/>
</element>
</optional>
<optional>
<element name="xcon:video-layout">
<ref name="video-layout-type"/>
</element>
</optional>
<zeroOrMore>
<ref name="anyElement"/>
</zeroOrMore>
</interleave>
</define>
<!--
GAIN TYPE
-->
<define name="gain-type">
<data type="int">
<param name="minInclusive">-127</param>
<param name="maxInclusive">127</param>
</data>
</define>
<!--
VIDEO LAYOUT TYPE
-->
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<define name="video-layout-type">
<choice>
<value type="string">single-view</value>
<value type="string">dual-view</value>
<value type="string">dual-view-crop</value>
<value type="string">dual-view-2x1</value>
<value type="string">dual-view-2x1-crop</value>
<value type="string">quad-view</value>
<value type="string">multiple-3x3</value>
<value type="string">multiple-4x4</value>
<value type="string">multiple-5x1</value>
<value type="string">automatic</value>
<ref name="free-text-extension"/>
</choice>
</define>
<!--
FLOOR INFORMATION TYPE
-->
<define name="floor-information-type">
<interleave>
<ref name="anyAttribute"/>
<optional>
<element name="xcon:conference-ID">
<data type="unsignedLong"/>
</element>
</optional>
<optional>
<element name="xcon:allow-floor-events">
<data type="boolean"/>
</element>
</optional>
<optional>
<element name="xcon:floor-request-handling">
<ref name="floor-request-type"/>
</element>
</optional>
<optional>
<element name="xcon:conference-floor-policy">
<ref name="conference-floor-policy"/>
</element>
</optional>
<zeroOrMore>
<ref name="anyElement"/>
</zeroOrMore>
</interleave>
</define>
<!--
FLOOR REQUEST TYPE
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-->
<define name="floor-request-type">
<choice>
<value type="string">block</value>
<value type="string">confirm</value>
<ref name="free-text-extension"/>
</choice>
</define>
<!--
CONFERENCE FLOOR POLICY
-->
<define name="conference-floor-policy">
<interleave>
<ref name="anyAttribute"/>
<oneOrMore>
<element name="xcon:floor">
<interleave>
<attribute name="id">
<text/>
</attribute>
<ref name="anyAttribute"/>
<oneOrMore>
<element name="xcon:media-label">
<data type="nonNegativeInteger"/>
</element>
</oneOrMore>
<optional>
<element name="xcon:algorithm">
<ref name="algorithm-type"/>
</element>
</optional>
<optional>
<element name="xcon:max-floor-users">
<data type="nonNegativeInteger"/>
</element>
</optional>
<optional>
<element name="xcon:moderator-id">
<data type="nonNegativeInteger"/>
</element>
</optional>
<zeroOrMore>
<ref name="anyElement"/>
</zeroOrMore>
</interleave>
</element>
</oneOrMore>
</interleave>
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</define>
<!--
ALGORITHM POLICY
-->
<define name="algorithm-type">
<choice>
<value type="string">moderator-controlled</value>
<value type="string">FCFS</value>
<value type="string">random</value>
<ref name="free-text-extension"/>
</choice>
</define>
<!--
USERS ADMISSION POLICY
-->
<define name="user-admission-policy-type">
<choice>
<value type="string">closedAuthenticated</value>
<value type="string">openAuthenticated</value>
<value type="string">anonymous</value>
<ref name="free-text-extension"/>
</choice>
</define>
<!--
JOIN HANDLING TYPE
-->
<define name="join-handling-type">
<choice>
<value type="string">block</value>
<value type="string">confirm</value>
<value type="string">allow</value>
<value type="string">authenticate</value>
<value type="string">directed-operator</value>
<ref name="free-text-extension"/>
</choice>
</define>
<!--
DENY USERLIST
-->
<define name="deny-user-list-type">
<interleave>
<ref name="anyAttribute"/>
<zeroOrMore>
<element name="xcon:target">
<attribute name="uri">
<data type="anyURI"/>
</attribute>
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<ref name="anyAttribute"/>
</element>
</zeroOrMore>
<zeroOrMore>
<ref name="anyElement"/>
</zeroOrMore>
</interleave>
</define>
<!--
ALLOWED USERS LIST TYPE
-->
<define name="allowed-users-list-type">
<interleave>
<ref name="anyAttribute"/>
<zeroOrMore>
<element name="xcon:target">
<ref name="target-type"/>
</element>
</zeroOrMore>
<optional>
<element name="xcon:persistent-list">
<ref name="persistent-list-type"/>
</element>
</optional>
<zeroOrMore>
<ref name="anyElement"/>
</zeroOrMore>
</interleave>
</define>
<!--
PERSISTENT LIST TYPE
-->
<define name="persistent-list-type">
<interleave>
<zeroOrMore>
<element name="xcon:user">
<interleave>
<attribute name="name">
<text/>
</attribute>
<attribute name="nickname">
<text/>
</attribute>
<attribute name="id">
<text/>
</attribute>
<ref name="anyAttribute"/>
<zeroOrMore>
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<element name="xcon:e-mail">
<text/>
</element>
</zeroOrMore>
<zeroOrMore>
<ref name="anyElement"/>
</zeroOrMore>
</interleave>
</element>
</zeroOrMore>
<zeroOrMore>
<ref name="anyElement"/>
</zeroOrMore>
</interleave>
</define>
<!--
TARGET TYPE
-->
<define name="target-type">
<attribute name="uri">
<data type="anyURI"/>
</attribute>
<attribute name="method">
<ref name="method-type"/>
</attribute>
<ref name="anyAttribute"/>
</define>
<!--
METHOD TYPE
-->
<define name="method-type">
<choice>
<value type="string">dial-in</value>
<value type="string">dial-out</value>
<value type="string">refer</value>
<ref name="free-text-extension"/>
</choice>
</define>
<!--
ANONYMITY TYPE
-->
<define name="provide-anonymity-type">
<choice>
<value>private</value>
<value>semi-private</value>
<value>hidden</value>
<ref name="free-text-extension"/>
</choice>
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</define>
<!--
MIXER TYPE
-->
<define name="mixer-type">
<interleave>
<attribute name="name">
<ref name="mixer-name-type"/>
</attribute>
<ref name="anyAttribute"/>
<zeroOrMore>
<element name="xcon:floor">
<attribute name="id">
<text/>
</attribute>
<ref name="anyAttribute"/>
<data type="boolean"/>
</element>
</zeroOrMore>
<zeroOrMore>
<element name="xcon:controls">
<ref name="control-type"/>
</element>
</zeroOrMore>
<zeroOrMore>
<ref name="anyElement"/>
</zeroOrMore>
</interleave>
</define>
<!--
MIXER NAME TYPE
-->
<define name="mixer-name-type">
<choice>
<value>VideoIn</value>
<value>VideoOut</value>
<value>AudioOut</value>
<value>AudioIn</value>
<ref name="free-text-extension"/>
</choice>
</define>
<!--
FREE TEXT EXTENSION
-->
<define name="free-text-extension">
<text/>
</define>
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<!--
*********************************
EXTENSIBILITY OF THE SCHEMA
*********************************
-->
<!--
EXTENSIBILITY ELEMENTS
-->
<define name="anyElement">
<element>
<anyName>
<except>
<name>conference-description</name>
<name>host-info</name>
<name>conference-state</name>
<name>users</name>
<name>sidebars-by-ref</name>
<name>sidebars-by-val</name>
<name>display-text</name>
<name>subject</name>
<name>free-text</name>
<name>keywords</name>
<name>conf-uris</name>
<name>service-uris</name>
<name>maximum-user-count</name>
<name>available-media</name>
<name>web-page</name>
<name>uris</name>
<name>uri</name>
<name>user-count</name>
<name>active</name>
<name>locked</name>
<name>entry</name>
<name>type</name>
<name>status</name>
<name>purpose</name>
<name>modified</name>
<name>user</name>
<name>associated-aors</name>
<name>roles</name>
<name>languages</name>
<name>cascaded-focus</name>
<name>endpoint</name>
<name>referred</name>
<name>joining-method</name>
<name>joining-info</name>
<name>disconnection-method</name>
<name>disconnection-info</name>
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<name>media</name>
<name>call-info</name>
<name>when</name>
<name>reason</name>
<name>by</name>
<name>sip</name>
<name>call-id</name>
<name>from-tag</name>
<name>to-tag</name>
<name>label</name>
<name>src-id</name>
<name>xcon:conference-password</name>
<name>xcon:mixing-mode</name>
<name>xcon:codecs</name>
<name>xcon:controls</name>
<name>xcon:language</name>
<name>xcon:allow-sidebars</name>
<name>xcon:cloning-parent</name>
<name>xcon:sidebar-parent</name>
<name>xcon:allow-conference-event-subscription</name>
<name>xcon:to-mixer</name>
<name>xcon:provide-anonymity</name>
<name>xcon:allow-refer-users-dynamically</name>
<name>xcon:allow-invite-users-dynamically</name>
<name>xcon:allow-remove-users-dynamically</name>
<name>xcon:from-mixer</name>
<name>xcon:join-handling</name>
<name>xcon:user-admission-policy</name>
<name>xcon:allowed-users-list</name>
<name>xcon:deny-users-list</name>
<name>xcon:floor-information</name>
<name>xcon:conference-time</name>
<name>xcon:provide-anonymity</name>
<name>xcon:floor</name>
<name>xcon:entry</name>
<name>xcon:mixing-start-offset</name>
<name>xcon:mixing-end-offset</name>
<name>xcon:can-join-after-offset</name>
<name>xcon:must-join-before-offset</name>
<name>xcon:request-user</name>
<name>xcon:notify-end-of-conference</name>
<name>xcon:allowed-extend-mixing-end-offset</name>
<name>xcon:codec</name>
<name>xcon:subtype</name>
<name>xcon:mute</name>
<name>xcon:pause-video</name>
<name>xcon:gain</name>
<name>xcon:video-layout</name>
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<name>xcon:conference-ID</name>
<name>xcon:allow-floor-events</name>
<name>xcon:floor-request-handling</name>
<name>xcon:conference-floor-policy</name>
<name>xcon:media-label</name>
<name>xcon:algorithm</name>
<name>xcon:max-floor-users</name>
<name>xcon:moderator-id</name>
<name>xcon:target</name>
<name>xcon:persistent-list</name>
<name>xcon:e-mail</name>
<name>xcon:user</name>
</except>
</anyName>
<ref name="anyExtension"/>
</element>
</define>
<define name="anyExtension">
<zeroOrMore>
<choice>
<attribute>
<anyName/>
</attribute>
<ref name="any"/>
</choice>
</zeroOrMore>
</define>
<define name="any">
<element>
<anyName/>
<zeroOrMore>
<choice>
<attribute>
<anyName/>
</attribute>
<text/>
<ref name="any"/>
</choice>
</zeroOrMore>
</element>
</define>
<!--
EXTENSIBILITY ATTRIBUTES
-->
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<define name="anyAttribute">
<zeroOrMore>
<attribute>
<anyName>
<except>
<name ns="http://www.w3.org/XML/1998/namespace">lang
</name>
<name ns="">entity</name>
<name ns="">required-participant</name>
<name ns="">label</name>
<name ns="">decision</name>
<name ns="">name</name>
<name ns="">policy</name>
<name ns="">uri</name>
<name ns="">method</name>
<name ns="">id</name>
<name ns="">nickname</name>
</except>
</anyName>
</attribute>
</zeroOrMore>
</define>
</grammar>
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Appendix B. Non-Normative W3C XML Schema
The non-normative W3C XML schema defines extension elements in the
"urn:ietf:params:xml:ns:xcon-conference-info" namespace. Note that
<xs:any> extensions in this schema are stricter than in the normative
RELAX NG schema [RELAX], and the normative RELAX NG schema [RELAX]
allows unordered child elements unlike this schema (and the [RFC4575]
schema). Also, note that this schema allows otherwise valid
extension elements to appear in the non-allowed positions. Likewise,
the cardinalities of these extension elements cannot be constrained
with this schema.
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema
xmlns="urn:ietf:params:xml:ns:xcon-conference-info"
xmlns:info="urn:ietf:params:xml:ns:conference-info"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
attributeFormDefault="unqualified" elementFormDefault="qualified"
targetNamespace="urn:ietf:params:xml:ns:xcon-conference-info">
<xs:import namespace="urn:ietf:params:xml:ns:conference-info"
schemaLocation="rfc4575.xsd"/>
<xs:import namespace="http://www.w3.org/XML/1998/namespace"
schemaLocation="http://www.w3.org/2001/03/xml.xsd"/>
<xs:element name="mixing-mode" type="mixing-mode-type"/>
<xs:element name="codecs" type="codecs-type"/>
<xs:element name="conference-password" type="xs:string"/>
<xs:element name="controls" type="controls-type"/>
<xs:element name="language" type="xs:language"/>
<xs:element name="allow-sidebars" type="xs:boolean"/>
<xs:element name="cloning-parent" type="xs:anyURI"/>
<xs:element name="sidebar-parent" type="xs:anyURI"/>
<xs:element name="conference-time" type="conference-time-type"/>
<xs:element name="allow-conference-event-subscription"
type="xs:boolean"/>
<xs:element name="to-mixer" type="mixer-type"/>
<xs:element name="provide-anonymity"
type="provide-anonymity-type"/>
<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="from-mixer" type="mixer-type"/>
<xs:element name="join-handling" type="join-handling-type"/>
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<xs:element name="user-admission-policy"
type="user-admission-policy-type"/>
<xs:element name="allowed-users-list"
type="allowed-users-list-type"/>
<xs:element name="deny-users-list" type="deny-users-list-type"/>
<xs:element name="floor-information" type="floor-information-type"/>
<!-- CONFERENCE TIME -->
<xs:complexType name="conference-time-type">
<xs:sequence>
<xs:element name="entry"
minOccurs="0" maxOccurs="unbounded">
<xs:complexType>
<xs:sequence>
<xs:element name="base"
type="xs:string" minOccurs="1"/>
<xs:element name="mixing-start-offset" minOccurs="0">
<xs:complexType>
<xs:simpleContent>
<xs:extension base="time-type">
<xs:attribute name="required-participant"
type="role-type" use="required"/>
<xs:anyAttribute namespace="##any"
processContents="lax"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
</xs:element>
<xs:element name="mixing-end-offset" minOccurs="0">
<xs:complexType>
<xs:simpleContent>
<xs:extension base="time-type">
<xs:attribute name="required-participant"
type="role-type" use="required"/>
<xs:anyAttribute namespace="##any"
processContents="lax"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
</xs:element>
<xs:element name="can-join-after-offset" type="time-type"
minOccurs="0"/>
<xs:element name="must-join-before-offset"
type="time-type" minOccurs="0"/>
<xs:element name="request-user" type="time-type"
minOccurs="0"/>
<xs:element name="notify-end-of-conference"
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type="xs:nonNegativeInteger" minOccurs="0"/>
<xs:element name="allowed-extend-mixing-end-offset"
type="xs:boolean" minOccurs="0"/>
<xs:any namespace="##other" processContents="lax"
minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:any namespace="##other" processContents="lax"
minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
<xs:anyAttribute namespace="##any" processContents="lax"/>
</xs:complexType>
<!-- TIME TYPE -->
<xs:simpleType name="time-type">
<xs:restriction base="xs:dateTime">
<xs:pattern value=".+T.+Z.*"/>
</xs:restriction>
</xs:simpleType>
<!-- ROLE-TYPE -->
<xs:simpleType name="role-type">
<xs:restriction base="xs:string">
<xs:pattern value="none"/>
<xs:pattern value="administrator"/>
<xs:pattern value="moderator"/>
<xs:pattern value="user"/>
<xs:pattern value="observer"/>
<xs:pattern value="participant"/>
<xs:pattern value=".+"/>
</xs:restriction>
</xs:simpleType>
<!-- MIXING MODE TYPE -->
<xs:simpleType name="mixing-mode-type">
<xs:restriction base="xs:string">
<xs:pattern value="moderator-controlled"/>
<xs:pattern value="FCFS"/>
<xs:pattern value="automatic"/>
<xs:pattern value=".+"/>
</xs:restriction>
</xs:simpleType>
<!-- CODECS TYPE -->
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<xs:complexType name="codecs-type">
<xs:sequence>
<xs:element name="codec" type="codec-type"/>
<xs:any namespace="##other" processContents="lax"
minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
<xs:attribute name="decision"
type="decision-type" use="required"/>
<xs:anyAttribute namespace="##any" processContents="lax"/>
</xs:complexType>
<!-- CODEC TYPE -->
<xs:complexType name="codec-type">
<xs:sequence>
<xs:element name="subtype" type="xs:string" minOccurs="0"/>
<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:anyAttribute namespace="##any" processContents="lax"/>
</xs:complexType>
<!-- DECISION TYPE -->
<xs:simpleType name="decision-type">
<xs:restriction base="xs:string">
<xs:pattern value="automatic"/>
<xs:pattern value="moderator-controlled"/>
<xs:pattern value=".+"/>
</xs:restriction>
</xs:simpleType>
<!-- POLICY TYPE -->
<xs:simpleType name="policy-type">
<xs:restriction base="xs:string">
<xs:pattern value="allowed"/>
<xs:pattern value="disallowed"/>
<xs:pattern value=".+"/>
</xs:restriction>
</xs:simpleType>
<!-- CONTROL TYPE -->
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<xs:complexType name="controls-type">
<xs:sequence>
<xs:element name="mute"
type="xs:boolean" minOccurs="0"/>
<xs:element name="pause-video"
type="xs:boolean" minOccurs="0"/>
<xs:element name="gain"
type="gain-type" minOccurs="0"/>
<xs:element name="video-layout"
type="video-layout-type" default="single-view" minOccurs="0"/>
<xs:any namespace="##other" processContents="lax"
minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
<xs:anyAttribute namespace="##any" processContents="lax"/>
</xs:complexType>
<!-- GAIN TYPE -->
<xs:simpleType name="gain-type">
<xs:restriction base="xs:integer">
<xs:minInclusive value="-127"/>
<xs:maxInclusive value="127"/>
</xs:restriction>
</xs:simpleType>
<!-- VIDEO LAYOUT TYPE -->
<xs:simpleType name="video-layout-type">
<xs:restriction base="xs:string">
<xs:pattern value="single-view"/>
<xs:pattern value="dual-view"/>
<xs:pattern value="dual-view-crop"/>
<xs:pattern value="dual-view-2x1"/>
<xs:pattern value="dual-view-2x1-crop"/>
<xs:pattern value="quad-view"/>
<xs:pattern value="multiple-3x3"/>
<xs:pattern value="multiple-4x4"/>
<xs:pattern value="multiple-5x1"/>
<xs:pattern value="automatic"/>
<xs:pattern value=".+"/>
</xs:restriction>
</xs:simpleType>
<!-- FLOOR INFORMATION TYPE -->
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<xs:complexType name="floor-information-type">
<xs:sequence>
<xs:element name="conference-ID"
type="xs:unsignedLong" minOccurs="0"/>
<xs:element name="allow-floor-events"
type="xs:boolean" default="false" minOccurs="0"/>
<xs:element name="floor-request-handling"
type="floor-request-handling-type" minOccurs="0"/>
<xs:element name="conference-floor-policy"
type="conference-floor-policy" minOccurs="0"/>
<xs:any namespace="##other" processContents="lax"
minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
<xs:anyAttribute namespace="##any" processContents="lax"/>
</xs:complexType>
<!-- FLOOR REQUEST TYPE -->
<xs:simpleType name="floor-request-handling-type">
<xs:restriction base="xs:string">
<xs:pattern value="block"/>
<xs:pattern value="confirm"/>
<xs:pattern value=".+"/>
</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-label"
type="xs:string" minOccurs="1" maxOccurs="unbounded"/>
<xs:element name="algorithm"
type="algorithm-type" minOccurs="0"/>
<xs:element name="max-floor-users"
type="xs:nonNegativeInteger" minOccurs="0"/>
<xs:element name="moderator-id"
type="xs:nonNegativeInteger" minOccurs="0"/>
<xs:any namespace="##other" processContents="lax"
minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
<xs:attribute name="id" type="xs:string" use="required"/>
<xs:anyAttribute namespace="##any" processContents="lax"/>
</xs:complexType>
</xs:element>
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</xs:sequence>
<xs:anyAttribute namespace="##any" processContents="lax"/>
</xs:complexType>
<!-- ALGORITHM TYPE -->
<xs:simpleType name="algorithm-type">
<xs:restriction base="xs:string">
<xs:pattern value="moderator-controlled"/>
<xs:pattern value="FCFS"/>
<xs:pattern value="random"/>
<xs:pattern value=".+"/>
</xs:restriction>
</xs:simpleType>
<!-- USER ADMISSION POLICY TYPE -->
<xs:simpleType name="user-admission-policy-type">
<xs:restriction base="xs:string">
<xs:pattern value="closedAuthenticated"/>
<xs:pattern value="openAuthenticated"/>
<xs:pattern value="anonymous"/>
<xs:pattern value=".+"/>
</xs:restriction>
</xs:simpleType>
<!-- JOIN HANDLING TYPE -->
<xs:simpleType name="join-handling-type">
<xs:restriction base="xs:string">
<xs:pattern value="block"/>
<xs:pattern value="confirm"/>
<xs:pattern value="allow"/>
<xs:pattern value="authenticate"/>
<xs:pattern value="directed-operator"/>
<xs:pattern value=".+"/>
</xs:restriction>
</xs:simpleType>
<!-- DENY USER LIST TYPE -->
<xs:complexType name="deny-users-list-type">
<xs:sequence>
<xs:element name="target" minOccurs="0" maxOccurs="unbounded">
<xs:complexType>
<xs:attribute name="uri" use="required" type="xs:anyURI"/>
<xs:anyAttribute namespace="##any" processContents="lax"/>
</xs:complexType>
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</xs:element>
<xs:any namespace="##other" processContents="lax"
minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
<xs:anyAttribute namespace="##any" processContents="lax"/>
</xs:complexType>
<!-- ALLOWED USERS LIST TYPE -->
<xs:complexType name="allowed-users-list-type">
<xs:sequence>
<xs:element name="target" type="target-type"
minOccurs="0" maxOccurs="unbounded">
</xs:element>
<xs:element name="persistent-list"
type="persistent-list-type"
minOccurs="0"/>
<xs:any namespace="##other" processContents="lax"
minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
<xs:anyAttribute namespace="##any" processContents="lax"/>
</xs:complexType>
<!-- PERSISTENT LIST TYPE -->
<xs:complexType name="persistent-list-type">
<xs:sequence>
<xs:element name="user" minOccurs="0" maxOccurs="unbounded">
<xs:complexType>
<xs:sequence>
<xs:element name="email" type="xs:string"
minOccurs="0" maxOccurs="unbounded"/>
<xs:any namespace="##other" processContents="lax"
minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
<xs:attribute name="name"
use="required" type="xs:anyURI"/>
<xs:attribute name="nickname"
use="required" type="xs:string"/>
<xs:attribute name="id"
use="required" type="xs:string"/>
<xs:anyAttribute namespace="##any" processContents="lax"/>
</xs:complexType>
</xs:element>
<xs:any namespace="##other" processContents="lax"
minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
<xs:anyAttribute namespace="##any" processContents="lax"/>
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</xs:complexType>
<!-- TARGET TYPE -->
<xs:complexType name="target-type">
<xs:attribute name="uri" use="required"
type="xs:anyURI"/>
<xs:attribute name="method" use="required"
type="method-type"/>
<xs:anyAttribute namespace="##any" processContents="lax"/>
</xs:complexType>
<!-- METHOD TYPE -->
<xs:simpleType name="method-type">
<xs:restriction base="xs:string">
<xs:pattern value="dial-in"/>
<xs:pattern value="dial-out"/>
<xs:pattern value="refer"/>
<xs:pattern value=".+"/>
</xs:restriction>
</xs:simpleType>
<!-- ANONYMITY TYPE -->
<xs:simpleType name="provide-anonymity-type">
<xs:restriction base="xs:string">
<xs:pattern value="private"/>
<xs:pattern value="semi-private"/>
<xs:pattern value="hidden"/>
<xs:pattern value=".+"/>
</xs:restriction>
</xs:simpleType>
<!-- MIXER TYPE -->
<xs:complexType name="mixer-type">
<xs:sequence>
<xs:element name="floor">
<xs:complexType>
<xs:simpleContent>
<xs:extension base="xs:boolean">
<xs:attribute name="id" type="xs:string"
use="required"/>
<xs:anyAttribute namespace="##any"
processContents="lax"/>
</xs:extension>
</xs:simpleContent>
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</xs:complexType>
</xs:element>
<xs:element name="controls" type="controls-type"
minOccurs="0" maxOccurs="unbounded"/>
<xs:any namespace="##other" processContents="lax"
minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
<xs:attribute name="name" type="mixer-name-type"
use="required"/>
<xs:anyAttribute namespace="##any" processContents="lax"/>
</xs:complexType>
<!-- MIXER NAME TYPE -->
<xs:simpleType name="mixer-name-type">
<xs:restriction base="xs:string">
<xs:pattern value="VideoIn"/>
<xs:pattern value="VideoOut"/>
<xs:pattern value="AudioOut"/>
<xs:pattern value="AudioIn"/>
<xs:pattern value=".+"/>
</xs:restriction>
</xs:simpleType>
</xs:schema>
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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 V3C
Boston, MA 02109-3614
USA
EMail: Dave.Morgan@fmr.com
Jari Urpalainen
Nokia
Itamerenkatu 11-13
Helsinki 00180
Finland
Phone: +358 7180 37686
EMail: jari.urpalainen@nokia.com
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