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Internet Engineering Task Force (IETF) O. NovoRequest for Comments: 6501 G. CamarilloCategory: Standards Track EricssonISSN: 2070-1721 D. Morgan Fidelity Investments J. Urpalainen Nokia March 2012Conference Information Data Modelfor Centralized Conferencing (XCON)AbstractRFC 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 inSection 2 of RFC 5741. Information about the current status of this document, any errata, and how to provide feedback on it may be obtained athttp://www.rfc-editor.org/info/rfc6501.Novo, et al. Standards Track [Page 1]
RFC 6501 Data Model Schema March 2012Copyright Notice Copyright (c) 2012 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject toBCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. This document may contain material from IETF Documents or IETF Contributions published or made publicly available before November 10, 2008. The person(s) controlling the copyright in some of this material may not have granted the IETF Trust the right to allow modifications of such material outside the IETF Standards Process. Without obtaining an adequate license from the person(s) controlling the copyright in such materials, this document may not be modified outside the IETF Standards Process, and derivative works of it may not be created outside the IETF Standards Process, except to format it for publication as an RFC or to translate it into languages other than English.Table of Contents1. Introduction ....................................................42. Terminology .....................................................43. Overview ........................................................43.1. Data Model Format ..........................................53.2. Data Model Namespace .......................................53.3. The Conference Object Identifier ...........................53.3.1. Conference Object URI Definition ....................73.3.2. Normalization and Conference Object URI Comparison ..73.4. Data Model Structure .......................................74. Data Model Definition ...........................................84.1. <conference-info> .........................................124.2. <conference-description> ..................................124.2.1. <language> .........................................134.2.2. <allow-sidebars> ...................................134.2.3. <cloning-parent> ...................................134.2.4. <sidebar-parent> ...................................134.2.5. <conference-time> ..................................134.2.6. <conf-uris> ........................................154.2.7. <available-media> ..................................15Novo, et al. Standards Track [Page 2]
RFC 6501 Data Model Schema March 20124.3. <host-info> ...............................................184.4. <conference-state> ........................................184.4.1. <allow-conference-event-subscription> ..............184.5. <floor-information> .......................................184.5.1. <conference-ID> ....................................194.5.2. <allow-floor-events> ...............................194.5.3. <floor-request-handling> ...........................194.5.4. <conference-floor-policy> ..........................204.6. <users> ...................................................204.6.1. <join-handling> ....................................214.6.2. <user-admission-policy> ............................214.6.3. <allowed-users-list> ...............................224.6.4. <deny-users-list> ..................................234.6.5. <user> and Its <user> Sub-Elements .................244.6.5.1. <provide-anonymity> .......................254.6.5.2. <roles> ...................................264.6.5.3. <allow-refer-users-dynamically> ...........264.6.5.4. <allow-invite-users-dynamically> ..........264.6.5.5. <allow-remove-users-dynamically> ..........264.6.5.6. <endpoint> ................................274.7. <sidebars-by-ref> .........................................284.8. <sidebars-by-val> .........................................285. RELAX NG Schema ................................................286. XML Schema Extensibility .......................................397. XML Example ....................................................398. Security Considerations ........................................499. IANA Considerations ............................................519.1. RELAX NG Schema Registration ..............................519.2. XML Namespace Registration ................................529.3. Conference Object Identifier Registration .................529.4. Conference User Identifier Registration ...................5310. Acknowledgements ..............................................5311. References ....................................................5311.1. Normative References .....................................5311.2. Informative References ...................................54Appendix A. Non-Normative RELAX NG Schema in XML Syntax ..........56Appendix B. Non-Normative W3C XML Schema .........................84Novo, et al. Standards Track [Page 3]
RFC 6501 Data Model Schema March 20121. 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 inRFC 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 basicNovo, et al. Standards Track [Page 4]
RFC 6501 Data Model Schema March 2012 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 inSection 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-info3.3. 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).Novo, et al. Standards Track [Page 5]
RFC 6501 Data Model Schema March 2012 +--------------------------+ | 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.Novo, et al. Standards Track [Page 6]
RFC 6501 Data Model Schema March 2012 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 inRFC 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],Section6.2.1. The host construction, as defined inRFC 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).Novo, et al. Standards Track [Page 7]
RFC 6501 Data Model Schema March 2012 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>*Novo, et al. Standards Track [Page 8]
RFC 6501 Data Model Schema March 2012 | | | |--<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>*Novo, et al. Standards Track [Page 9]
RFC 6501 Data Model Schema March 2012 | | | | |--<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>Novo, et al. Standards Track [Page 10]
RFC 6501 Data Model Schema March 2012 | | | | | | | ... | | |--<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> | ...Novo, et al. Standards Track [Page 11]
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 inSection 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 inSection 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 inSection 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.Novo, et al. Standards Track [Page 12]
RFC 6501 Data Model Schema March 20124.2.1. <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.Novo, et al. Standards Track [Page 13]
RFC 6501 Data Model Schema March 2012 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.Novo, et al. Standards Track [Page 14]
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 inSection 5.3.1 of [RFC4575]. The RELAX NG schema inSection 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 inSection 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 theNovo, et al. Standards Track [Page 15]
RFC 6501 Data Model Schema March 2012 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.Novo, et al. Standards Track [Page 16]
RFC 6501 Data Model Schema March 2012 * 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).Novo, et al. Standards Track [Page 17]
RFC 6501 Data Model Schema March 2012 + 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.Novo, et al. Standards Track [Page 18]
RFC 6501 Data Model Schema March 20124.5.1. <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 inSection 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 (seeSection 4.6.1).Novo, et al. Standards Track [Page 19]
RFC 6501 Data Model Schema March 20124.5.4. <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.Novo, et al. Standards Track [Page 20]
RFC 6501 Data Model Schema March 20124.6.1. <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. ANovo, et al. Standards Track [Page 21]
RFC 6501 Data Model Schema March 2012 '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 inSection 4.6.5), roles (defined inSection 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.Novo, et al. Standards Track [Page 22]
RFC 6501 Data Model Schema March 2012 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 inSection 4.6.5), roles (defined inSection 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.Novo, et al. Standards Track [Page 23]
RFC 6501 Data Model Schema March 20124.6.5. <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 inRFC 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.Novo, et al. Standards Track [Page 24]
RFC 6501 Data Model Schema March 2012 +----------------+ | 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.Novo, et al. Standards Track [Page 25]
RFC 6501 Data Model Schema March 20124.6.5.2. <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.Novo, et al. Standards Track [Page 26]
RFC 6501 Data Model Schema March 20124.6.5.6. <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.Novo, et al. Standards Track [Page 27]
RFC 6501 Data Model Schema March 2012 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.Novo, et al. Standards Track [Page 28]
RFC 6501 Data Model Schema March 2012default 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 TYPEconference-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 TYPEconference-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 TYPEhost-type = element display-text { text }? & element web-page { xsd:anyURI }? & element uris { uris-type }? & anyElement* & anyAttribute# CONFERENCE STATE TYPEconference-state-type = anyAttributeNovo, et al. Standards Track [Page 29]
RFC 6501 Data Model Schema March 2012 & element user-count { xsd:unsignedInt }? & element active { xsd:boolean }? & element locked { xsd:boolean }? & element xcon:allow-conference-event-subscription { xsd:boolean }? & anyElement*# CONFERENCE MEDIA TYPEconference-media-type = anyAttribute & element entry { conference-medium-type }* & anyElement*# CONFERENCE MEDIUM TYPEconference-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 TYPEuris-type = anyAttribute & element entry { uri-type }* & anyElement*# URI TYPEuri-type = element uri { xsd:anyURI } & element display-text { text }? & element purpose { text }? & element modified { execution-type }? & element xcon:conference-password { text }* & anyElement* & anyAttribute# USERS TYPEusers-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 TYPEuser-type = attribute entity { xsd:anyURI } & anyAttributeNovo, et al. Standards Track [Page 30]
RFC 6501 Data Model Schema March 2012 & 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 TYPEendpoint-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 TYPEendpoint-status-type = "pending" | "dialing-out" | "dialing-in" | "alerting" | "on-hold" | "connected" | "muted-via-focus" | "disconnecting" | "disconnected" | free-text-extension# JOINING TYPEjoining-type = "dialed-in" | "dialed-out" | "focus-owner" | free-text-extension# DISCONNECTION TYPEdisconnection-type = "departed" | "booted" | "failed" | "busy" | free-text-extension# EXECUTION TYPENovo, et al. Standards Track [Page 31]
RFC 6501 Data Model Schema March 2012execution-type = element when { xsd:dateTime }? & element reason { text }? & element by { xsd:anyURI }? & anyAttribute# CALL TYPEcall-type = element sip { sip-dialog-id-type } & anyElement* & anyAttribute# SIP DIALOG ID TYPEsip-dialog-id-type = element display-text { text }? & element call-id { text } & element from-tag { text } & element to-tag { text } & anyElement* & anyAttribute# MEDIA TYPEmedia-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 TYPEmedia-status-type = "recvonly" | "sendonly" | "sendrecv" | "inactive" | free-text-extension# SIDEBARS-BY-VAL TYPEsidebars-by-val-type = anyAttribute & element entry { conference-type }* & anyElement*# CONFERENCE TIMEconferencetime-type = anyAttribute & element xcon:entry { element xcon:base { text }, element xcon:mixing-start-offset {Novo, et al. Standards Track [Page 32]
RFC 6501 Data Model Schema March 2012 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 TYPEtime-type = xsd:dateTime { pattern = ".+T.+Z.*" }# SINGLE ROLE TYPEsingle-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 TYPEmixing-mode-type = xsd:string "moderator-controlled" | xsd:string "FCFS" | xsd:string "automatic" | free-text-extension# CODECS TYPEcodecs-type = attribute decision { decision-type } & anyAttribute & element xcon:codec { codec-type }* & anyElement*# CODEC TYPEcodec-type = attribute name { text } & attribute policy { policy-type } & anyAttribute & element xcon:subtype { text }? & anyElement*# DECISION TYPEdecision-type =Novo, et al. Standards Track [Page 33]
RFC 6501 Data Model Schema March 2012 xsd:string "automatic" | xsd:string "moderator-controlled" | free-text-extension# POLICY TYPEpolicy-type = xsd:string "allowed" | xsd:string "disallowed" | free-text-extension# CONTROL TYPEcontrol-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 TYPEgain-type = xsd:int { minInclusive = "-127" maxInclusive = "127" }# VIDEO LAYOUT TYPEvideo-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 TYPEfloor-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 TYPEfloor-request-type = xsd:string "block" | xsd:string "confirm" | free-text-extension# CONFERENCE FLOOR POLICYconference-floor-policy = anyAttribute & element xcon:floor { attribute id { text } & anyAttribute & element xcon:media-label { xsd:nonNegativeInteger }+ & element xcon:algorithm { algorithm-type }?Novo, et al. Standards Track [Page 34]
RFC 6501 Data Model Schema March 2012 & element xcon:max-floor-users { xsd:nonNegativeInteger }? & element xcon:moderator-id { xsd:nonNegativeInteger }? & anyElement* }+# ALGORITHM POLICYalgorithm-type = xsd:string "moderator-controlled" | xsd:string "FCFS" | xsd:string "random" | free-text-extension# USERS ADMISSION POLICYuser-admission-policy-type = xsd:string "closedAuthenticated" | xsd:string "openAuthenticated" | xsd:string "anonymous" | free-text-extension# JOIN HANDLING TYPEjoin-handling-type = xsd:string "block" | xsd:string "confirm" | xsd:string "allow" | xsd:string "authenticate" | xsd:string "directed-operator" | free-text-extension# DENY USERLISTdeny-user-list-type = anyAttribute & element xcon:target { attribute uri { xsd:anyURI }, anyAttribute }* & anyElement*# ALLOWED USERS LIST TYPEallowed-users-list-type = anyAttribute & element xcon:target { target-type }* & element xcon:persistent-list { persistent-list-type }? & anyElement*# PERSISTENT LIST TYPEpersistent-list-type = element xcon:user { attribute name { text } & attribute nickname { text } & attribute id { text } & anyAttribute & element xcon:e-mail { text }* & anyElement* }*Novo, et al. Standards Track [Page 35]
RFC 6501 Data Model Schema March 2012 & anyElement*# TARGET TYPEtarget-type = attribute uri { xsd:anyURI }, attribute method { method-type }, anyAttribute# METHOD TYPEmethod-type = xsd:string "dial-in" | xsd:string "dial-out" | xsd:string "refer" | free-text-extension# ANONYMITY TYPEprovide-anonymity-type = "private" | "semi-private" | "hidden" | free-text-extension# MIXER TYPEmixer-type = attribute name { mixer-name-type } & anyAttribute & element xcon:controls { control-type }* & element xcon:floor { attribute id { text }, anyAttribute, xsd:boolean }* & anyElement*# MIXER NAME TYPEmixer-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-refNovo, et al. Standards Track [Page 36]
RFC 6501 Data Model Schema March 2012 | 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 | labelNovo, et al. Standards Track [Page 37]
RFC 6501 Data Model Schema March 2012 | 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-listNovo, et al. Standards Track [Page 38]
RFC 6501 Data Model Schema March 2012 | 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,Novo, et al. Standards Track [Page 39]
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>Novo, et al. Standards Track [Page 40]
RFC 6501 Data Model Schema March 2012 <!-- 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:2.0Novo, et al. Standards Track [Page 41]
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>Novo, et al. Standards Track [Page 42]
RFC 6501 Data Model Schema March 2012 <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> <type>video</type> <label>10235</label>Novo, et al. Standards Track [Page 43]
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> <!-- 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> <!-- ENDPOINTSNovo, et al. Standards Track [Page 44]
RFC 6501 Data Model Schema March 2012 --> <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> <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> <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>Novo, et al. Standards Track [Page 45]
RFC 6501 Data Model Schema March 2012 <from-tag>asd456cbgt</from-tag> <to-tag>3456jgjg1234</to-tag> </sip> </call-info> <xcon:floor>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> <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> <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>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]
RFC 6501 Data Model Schema March 2012 <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> <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 Sections11 and11.2, 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 inSection 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 inSection11.1 of the centralized conferencing framework document [RFC5239] also apply to this document. Similarly, the security considerations for authorization described inSection 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]
RFC 6501 Data Model Schema March 20129. IANA Considerations9.1. RELAX NG Schema Registration This specification registers a schema. The schema can be found as the sole content ofSection 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 inSection 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 20129.2. 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> END9.3. Conference Object Identifier Registration URI scheme name: xcon Status: permanent URI scheme syntax: seeSection 3.3.1. URI schema semantics: seeSection 3.3 Encoding considerations: seeSection 8 Intended usage: seeSection 3.3 Applications and/or protocols that use this URI scheme name: Centralized Conferencing systems Interoperability considerations: none Security considerations: seeSection 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 20129.4. Conference User Identifier Registration URI scheme name: XCON-USERID Status: permanent URI scheme syntax: seeSection 4.6.5 URI schema semantics: seeSection 4.6.5 Encoding considerations: seeSection 8 Intended usage: seeSection 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: seeSection 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. References11.1. 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 2012Appendix 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]
RFC 6501 Data Model Schema March 2012 <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]
RFC 6501 Data Model Schema March 2012 </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]
RFC 6501 Data Model Schema March 2012 </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]
RFC 6501 Data Model Schema March 2012 </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]
RFC 6501 Data Model Schema March 2012 </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]
RFC 6501 Data Model Schema March 2012 <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>Novo, et al. Standards Track [Page 65]
RFC 6501 Data Model Schema March 2012 </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">Novo, et al. Standards Track [Page 66]
RFC 6501 Data Model Schema March 2012 <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>Novo, et al. Standards Track [Page 67]
RFC 6501 Data Model Schema March 2012 <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>Novo, et al. Standards Track [Page 68]
RFC 6501 Data Model Schema March 2012 <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/>Novo, et al. Standards Track [Page 69]
RFC 6501 Data Model Schema March 2012 </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>Novo, et al. Standards Track [Page 70]
RFC 6501 Data Model Schema March 2012 </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"/>Novo, et al. Standards Track [Page 71]
RFC 6501 Data Model Schema March 2012 </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>Novo, et al. Standards Track [Page 72]
RFC 6501 Data Model Schema March 2012 </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 -->Novo, et al. Standards Track [Page 73]
RFC 6501 Data Model Schema March 2012 <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 TYPENovo, et al. Standards Track [Page 74]
RFC 6501 Data Model Schema March 2012 --> <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>Novo, et al. Standards Track [Page 75]
RFC 6501 Data Model Schema March 2012 </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>Novo, et al. Standards Track [Page 76]
RFC 6501 Data Model Schema March 2012 <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>Novo, et al. Standards Track [Page 77]
RFC 6501 Data Model Schema March 2012 <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>Novo, et al. Standards Track [Page 78]
RFC 6501 Data Model Schema March 2012 </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>Novo, et al. Standards Track [Page 79]
RFC 6501 Data Model Schema March 2012 <!-- ********************************* 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>Novo, et al. Standards Track [Page 80]
RFC 6501 Data Model Schema March 2012 <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>Novo, et al. Standards Track [Page 81]
RFC 6501 Data Model Schema March 2012 <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 -->Novo, et al. Standards Track [Page 82]
RFC 6501 Data Model Schema March 2012 <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>Novo, et al. Standards Track [Page 83]
RFC 6501 Data Model Schema March 2012Appendix 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"/>Novo, et al. Standards Track [Page 84]
RFC 6501 Data Model Schema March 2012 <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"Novo, et al. Standards Track [Page 85]
RFC 6501 Data Model Schema March 2012 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 -->Novo, et al. Standards Track [Page 86]
RFC 6501 Data Model Schema March 2012 <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 -->Novo, et al. Standards Track [Page 87]
RFC 6501 Data Model Schema March 2012 <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 -->Novo, et al. Standards Track [Page 88]
RFC 6501 Data Model Schema March 2012 <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>Novo, et al. Standards Track [Page 89]
RFC 6501 Data Model Schema March 2012 </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>Novo, et al. Standards Track [Page 90]
RFC 6501 Data Model Schema March 2012 </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"/>Novo, et al. Standards Track [Page 91]
RFC 6501 Data Model Schema March 2012 </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>Novo, et al. Standards Track [Page 92]
RFC 6501 Data Model Schema March 2012 </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>Novo, et al. Standards Track [Page 93]
RFC 6501 Data Model Schema March 2012Authors' 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.comNovo, et al. Standards Track [Page 94]
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