SIMPLE WG M. Lonnfors
Internet-Draft Nokia
Intended status: Standards Track E. Leppanen
Expires: May 22, 2008 Individual
H. Khartabil
Ericsson Australia
J. Urpalainen
Nokia
November 19, 2007
Presence Information Data format (PIDF) Extension for Partial Presence
draft-ietf-simple-partial-pidf-format-10
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Copyright Notice
Copyright (C) The IETF Trust (2007).
Abstract
The Presence Information Document Format (PIDF) specifies the
baseline XML based format for describing presence information. One
of the characteristic of the PIDF is that the document always needs
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to carry all presence information available for the presentity. In
some environments where low bandwidth and high latency links can
exist it is often beneficial to limit the amount of transported
information over the network. This document introduces a new MIME
type which enables transporting of either only the changed parts or
the full PIDF based presence information.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Conventions . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Structure of PIDF diff documents . . . . . . . . . . . . . . . 3
3.1. 'version' attribute . . . . . . . . . . . . . . . . . . . 5
3.2. 'entity' attribute . . . . . . . . . . . . . . . . . . . . 5
4. Usage of 'application/pidf-diff+xml' . . . . . . . . . . . . . 5
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 5
5.1. URN Sub-Namespace registration for
'urn:ietf:params:xml:ns:pidf-diff' . . . . . . . . . . . . 5
5.2. application/pidf-diff+xml MIME Type . . . . . . . . . . . 6
5.3. XML Schema Registration . . . . . . . . . . . . . . . . . 7
6. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
7. XML Schema . . . . . . . . . . . . . . . . . . . . . . . . . . 11
8. Interoperability Considerations . . . . . . . . . . . . . . . 13
9. Security Considerations . . . . . . . . . . . . . . . . . . . 13
10. Internationalization Considerations . . . . . . . . . . . . . 13
11. Error Handling . . . . . . . . . . . . . . . . . . . . . . . . 13
12. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 14
13. References . . . . . . . . . . . . . . . . . . . . . . . . . . 14
13.1. Normative references . . . . . . . . . . . . . . . . . . . 14
13.2. Informative references . . . . . . . . . . . . . . . . . . 15
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 15
Intellectual Property and Copyright Statements . . . . . . . . . . 17
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1. Introduction
The Presence Information Document Format (PIDF) [RFC3863] specifies
the baseline XML based format for describing presence information.
One of the characteristic of the PIDF is that the document always
needs to carry all presence information available for the presentity.
In some environments where low bandwidth and high latency links can
exist, it is often beneficial to limit the amount of transported
information over the network.
This document introduces a new MIME-Type 'application/pidf-diff+xml'
which enables transporting of either only the changed parts or the
full PIDF based presence information. The root element of the
document distinguishes whether the partial or full PIDF document
content was transported.
Note: With this new MIME-Type applications can easily negotiate
the support of partial updates of presence by using the Accept-
header. If PIDF had initially been designed for partial updates,
a new separate MIME-Type would have been unnecessary.
2. Conventions
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC2119] and
indicate requirement levels for compliant implementations.
This memo makes use of the vocabulary defined in RFC2778 [RFC2778].
In addition, the following terms are defined:
Full presence document: A presence document that contains all the
presentity's presence information that is available to a
particular watcher.
Partial presence document: A presence document that represents a
fragment of the full presence document. A partial presence
documents can only be understood in the context of the full
presence document, i.e. a partial presence document modifies a
cached copy of the full presence document.
3. Structure of PIDF diff documents
The MIME type 'application/pidf-diff+xml' defines the new content
type for partial PIDF documents.
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The XML Schema imports the PIDF [RFC3863] schema so that the full
PIDF document content with the addition of a 'version' attribute can
be transported. The root element of the document is then <pidf-full>
and the 'version' attribute information can be included within it.
Otherwise the content of <pidf-full> element is exactly the same as
what would have been if 'application/pidf+xml' content type had been
used. Although the XML Schema allows using also <presence> as the
document root element it is disallowed from applications utilizing
this document format.
When only the changes of the presence document are transported, the
model described in XML patch operations
[I-D.ietf-simple-xml-patch-ops] is used. The root element of the
document is then <pidf-diff>. The patch operation elements: <add>,
<remove> and <replace> allow changing the partial content of the
cached local copy of the full presence document. The <add> element
is used to add new content, the <replace> element updates and the
<remove> element removes existing content.
The optional 'version' attribute within the two possible document
root elements contains a sequence number which is incremented by one
between subsequent document updates, i.e. a more recent document
update has a higher 'version' value than the previous one. This
number can be used to ensure consistent updates as the recipient of
the document can use the 'version' number to properly order received
documents and to ensure that updates have not been lost. The usage
of this attribute thus allows "state delta" processing described in
[RFC3265]. Partial notification [I-D.ietf-simple-partial-notify]
uses similar model. This number increments independently regardless
of whether the <pidf-full> or the <pidf-diff> content is transported.
In other words, a single version counter is maintained across <pidf-
full> and <pidf-diff> documents.
Implementations using this document format MUST follow guidelines
specified in the PIDF [RFC3863] and PIDF extension formats, for
example DataModel [RFC4479], RPID [RFC4480] and CIPID [RFC4482] and
MUST support the usage of the XML schema data type ID
[W3C.REC-xmlschema-2-20041028] of these listed RFCs. Specifically,
the XML document MUST be well formed and SHOULD be valid. This
specification makes use of XML namespaces for identifying presence
documents and document fragments. The namespace URI for elements
defined by this specification is a URN [RFC2141], using the namespace
identifier 'ietf' specified in RFC 2648 [RFC2648] and extended by
RFC3688 [RFC3688]. This URN is:
urn:ietf:params:xml:ns:pidf-diff
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3.1. 'version' attribute
Every presence document compliant with this specification MAY contain
a 'version' attribute within the <pidf-diff> and <pidf-full> element.
3.2. 'entity' attribute
Every presence document compliant with this specification MAY contain
an 'entity' attribute within the <pidf-diff> element. Its content, a
presentity URI MUST then be the same as the 'entity' attribute value
of the <presence> element described in [RFC3863]. The usage of this
presentity URI is described in more detail in section 3.1 of
[RFC4479].
4. Usage of 'application/pidf-diff+xml'
The partial presence document SHOULD only contain those elements or
attributes that have changed. However, when there are a lot of
changes the full presence document content can then be transported
instead.
5. IANA Considerations
This memo calls for IANA to:
o register a new XML namespace URN per [RFC3688].
o register a new MIME type 'application/pidf-diff+xml' according to
the procedures of RFC 4288 [RFC4288] and guidelines in RFC 3023
[RFC3023].
o register a new XML Schema according to the procedures of RFC 3688
[RFC3688].
5.1. URN Sub-Namespace registration for
'urn:ietf:params:xml:ns:pidf-diff'
This specification registers a new XML namespace, as per the
guidelines in RFC 3688 [RFC3688].
URI:
urn:ietf:params:xml:ns:pidf-diff
Description:
This is the XML namespace for XML elements defined by
[[[RFCXXXX]]] to describe the 'application/pidf-diff+xml' content
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type for partial PIDF.
Registrant Contact:
IETF, SIMPLE working group, (simple@ietf.org)
Jari Urpalainen, (jari.urpalainen@nokia.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>PIDF extension for partial PIDF</title>
</head>
<body>
<h1>Namespace for PIDF extension for partial
notifications</h1>
<h2>urn:ietf:params:xml:ns:pidf-diff</h2>
<p>See <a href="[[[URL of published RFC]]]">
RFCXXXX</a>.</p>
</body>
</html>
END
5.2. application/pidf-diff+xml MIME Type
MIME media type name: application
MIME subtype name: pidf-diff+xml
Mandatory parameters: none
Optional parameters:
Same as charset parameter of application/xml as specified in RFC
3023 [RFC3023]. Default value is UTF-8.
Encoding considerations:
Same as encoding considerations of application/xml as specified in
See RFC 3023 [RFC3023].
Security considerations:
See Section 10 of RFC 3023 [RFC3023]. This content type is
designed to carry presence data, which may be considered private
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information. Appropriate precautions should be adopted to limit
disclosure of this information.
Interoperability considerations: none
Published specification: [[[RFCXXXX]]]
Applications which use this media type: SIP-based presence systems
Additional information:
Magic Number: None
File Extension: .xml
Macintosh file type code: "TEXT"
Personal and email address for further information: Jari
Urpalainen, jari.urpalainen@nokia.com
Intended usage: LIMITED USE
Restrictions on usage: Presence [RFC3863] based systems.
Author:
This specification is a work item of the IETF SIMPLE working
group, with mailing list address <simple@ietf.org>.
Author/Change controller: the IETF.
5.3. XML Schema Registration
This section calls for IANA to register a new XML Schema, the sole
content of which can be found in Section 7.
URI:
urn:ietf:params:xml:schema:pidf-diff
Registrant Contact:
IETF, SIMPLE working group, <simple@ietf.org>
Jari Urpalainen, <jari.urpalainen@nokia.com>
6. Examples
An 'application/pidf-diff+xml' document that contains the full state
presence information:
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<?xml version="1.0" encoding="UTF-8"?>
<p:pidf-full xmlns="urn:ietf:params:xml:ns:pidf"
xmlns:p="urn:ietf:params:xml:ns:pidf-diff"
xmlns:r="urn:ietf:params:xml:ns:pidf:rpid"
xmlns:ci="urn:ietf:params:xml:ns:pidf:cipid"
xmlns:c="urn:ietf:params:xml:ns:pidf:caps"
xmlns:dm="urn:ietf:params:xml:ns:pidf:data-model"
entity="pres:someone@example.com"
version="567">
<tuple id="sg89ae">
<status>
<basic>open</basic>
</status>
<c:servcaps>
<c:audio>true</c:audio>
<c:message>true</c:message>
<c:video>false</c:video>
</c:servcaps>
<contact priority="0.8">tel:09012345678</contact>
</tuple>
<tuple id="cg231jcr">
<status>
<basic>open</basic>
</status>
<contact priority="1.0">im:pep@example.com</contact>
</tuple>
<tuple id="r1230d">
<status>
<basic>closed</basic>
</status>
<ci:homepage>http://example.com/~pep/</ci:homepage>
<ci:icon>http://example.com/~pep/icon.gif</ci:icon>
<ci:card>http://example.com/~pep/card.vcd</ci:card>
<contact priority="0.9">sip:pep@example.com</contact>
</tuple>
<note xml:lang="en">Full state presence document</note>
<dm:person id="p123">
<r:activities>
<r:on-the-phone/>
<r:busy/>
</r:activities>
</dm:person>
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<dm:device id="u600b40c7">
<c:devcaps>
<c:mobility>
<c:supported>
<c:mobile/>
</c:supported>
</c:mobility>
</c:devcaps>
<dm:deviceID>urn:esn:600b40c7</dm:deviceID>
</dm:device>
</p:pidf-full>
An example partial update document with the <pidf-diff> root element:
<?xml version="1.0" encoding="UTF-8"?>
<p:pidf-diff
xmlns="urn:ietf:params:xml:ns:pidf"
xmlns:p="urn:ietf:params:xml:ns:pidf-diff"
xmlns:r="urn:ietf:params:xml:ns:pidf:rpid"
xmlns:d="urn:ietf:params:xml:ns:pidf:data-model"
entity="pres:someone@example.com"
version="568">
<p:add sel="presence/note" pos="before">
<tuple id="ert4773">
<status>
<basic>open</basic>
</status>
<contact priority="0.4">mailto:pep@example.com</contact>
<note xml:lang="en">This is a new tuple inserted
between the last tuple and person element</note>
</tuple>
</p:add>
<p:replace sel="*/tuple[@id='r1230d']/status/basic/text()"
>open</p:replace>
<p:remove sel="*/d:person/r:activities/r:busy" ws="after"/>
<p:replace sel="*/tuple[@id='cg231jcr']/contact/@priority"
>0.7</p:replace>
</p:pidf-diff>
An updated local composition presence document after applying the
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patches:
<?xml version="1.0" encoding="UTF-8"?>
<p:pidf-full xmlns="urn:ietf:params:xml:ns:pidf"
xmlns:p="urn:ietf:params:xml:ns:pidf-diff"
xmlns:r="urn:ietf:params:xml:ns:pidf:rpid"
xmlns:ci="urn:ietf:params:xml:ns:pidf:cipid"
xmlns:c="urn:ietf:params:xml:ns:pidf:caps"
xmlns:dm="urn:ietf:params:xml:ns:pidf:data-model"
entity="pres:someone@example.com"
version="568">
<tuple id="sg89ae">
<status>
<basic>open</basic>
</status>
<c:servcaps>
<c:audio>true</c:audio>
<c:message>true</c:message>
<c:video>false</c:video>
</c:servcaps>
<contact priority="0.8">tel:09012345678</contact>
</tuple>
<tuple id="cg231jcr">
<status>
<basic>open</basic>
</status>
<contact priority="0.7">im:pep@example.com</contact>
</tuple>
<tuple id="r1230d">
<status>
<basic>open</basic>
</status>
<ci:homepage>http://example.com/~pep/</ci:homepage>
<ci:icon>http://example.com/~pep/icon.gif</ci:icon>
<ci:card>http://example.com/~pep/card.vcd</ci:card>
<contact priority="0.9">sip:pep@example.com</contact>
</tuple>
<tuple id="ert4773">
<status>
<basic>open</basic>
</status>
<contact priority="0.4">mailto:pep@example.com</contact>
<note xml:lang="en">This is a new tuple inserted
between the last tuple and note element</note>
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</tuple>
<note xml:lang="en">Full state presence document</note>
<dm:person id="p123">
<r:activities>
<r:on-the-phone/>
</r:activities>
</dm:person>
<dm:device id="u600b40c7">
<c:devcaps>
<c:mobility>
<c:supported>
<c:mobile/>
</c:supported>
</c:mobility>
</c:devcaps>
<dm:deviceID>urn:esn:600b40c7</dm:deviceID>
</dm:device>
</p:pidf-full>
7. XML Schema
The XML schema for the 'application/pidf-diff+xml' data format. The
included schema "urn:ietf:params:xml:schema:xml-patch-ops" is defined
in [I-D.ietf-simple-xml-patch-ops] and the PIDF Schema "pidf.xsd" is
imported from [RFC3863].
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<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema
targetNamespace="urn:ietf:params:xml:ns:pidf-diff"
xmlns:tns="urn:ietf:params:xml:ns:pidf-diff"
xmlns:pidf="urn:ietf:params:xml:ns:pidf"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
elementFormDefault="qualified">
<!-- include patch-ops type definitions -->
<xsd:include
schemaLocation="urn:ietf:params:xml:schema:patch-ops"/>
<!-- import PIDF definitions -->
<xsd:import namespace="urn:ietf:params:xml:ns:pidf"
schemaLocation="pidf.xsd"/>
<!-- partial updates -->
<xsd:element name="pidf-diff">
<xsd:complexType>
<xsd:sequence minOccurs="0" maxOccurs="unbounded">
<xsd:choice>
<xsd:element name="add" type="tns:add"/>
<xsd:element name="replace" type="tns:replace"/>
<xsd:element name="remove" type="tns:remove"/>
</xsd:choice>
</xsd:sequence>
<xsd:attribute name="version" type="xsd:unsignedInt"/>
<xsd:attribute name="entity" type="xsd:anyURI"/>
</xsd:complexType>
</xsd:element>
<!-- full PIDF in addition to optional version -->
<xsd:element name="pidf-full">
<xsd:complexType>
<xsd:complexContent>
<xsd:extension base="pidf:presence">
<xsd:attribute name="version" type="xsd:unsignedInt"/>
</xsd:extension>
</xsd:complexContent>
</xsd:complexType>
</xsd:element>
</xsd:schema>
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8. Interoperability Considerations
Systems compliant with CPP [RFC3859] will not be by default able to
use this specification. However, this will not cause any
interoperability problems because all endpoints and gateways must
support the default MIME type (application/pidf+xml) regardless if
they support this specification. Thus if a gateway or another end
point does not understand this specification it will not be used. In
SIMPLE based systems use of this MIME type is negotiated using SIP
content type negotiation mechanism as specified in partial
notification [I-D.ietf-simple-partial-notify].
Other CPP compliant (other than SIP based) systems can also support
this specification if they have a mechanism to indicate support for
it. If they do it is possible to build a gateway which will preserve
end-to-end integrity with usage of partial PIDF.
9. Security Considerations
All security considerations identified for PIDF [RFC3863] apply
unchanged for this document as presence information may contain
highly sensitive information. Furthermore, the protocol SHOULD
provide authorization policies what presence information can be given
to which watchers, and when, see [I-D.ietf-simple-presence-rules].
10. Internationalization Considerations
The PIDF [RFC3863] format is represented in XML which performs all
character processing in terms of the Universal Character Set (UCS).
Conformant XML processors MUST support both UTF-8 and UTF-16
encodings of the UCS. UTF-8 is the RECOMMENDED encoding of this
partial presence format.
If the character set of the initial <pidf-full> document has been
accepted by a receiving application, it MUST continue to accept the
same character set with the subsequent <pidf-diff> documents.
However, it MUST NOT need to accept a possible character set change.
11. Error Handling
Error conditions MAY be indicated by errors defined in
[I-D.ietf-simple-xml-patch-ops]. This document doesn't define any
additional error elements. If the 'version' or 'entity' attributes
have incorrect content if MAY be indicated by the <invalid-attribute-
value> error element.
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12. Acknowledgments
The authors would like to thank Jose Costa-Requena, Jyrki Aarnos,
Jonathan Rosenberg, Dean Willis, Miguel Garcia, Krisztian Kiss, Ben
Cambell, Robert Sparks, Anders Kristenssen, Aki Niemi, Jon Peterson,
Gonzalo Camarillo, Lars Eggert, Lakshminath Dondeti and Chris Newman
for their valuable comments and contributions.
13. References
13.1. Normative references
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC3863] Sugano, H., Fujimoto, S., Klyne, G., Bateman, A., Carr,
W., and J. Peterson, "Presence Information Data Format
(PIDF)", RFC 3863, August 2004.
[RFC2141] Moats, R., "URN Syntax", RFC 2141, May 1997.
[RFC2648] Moats, R., "A URN Namespace for IETF Documents", RFC 2648,
August 1999.
[RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
January 2004.
[RFC3023] Murata, M., St. Laurent, S., and D. Kohn, "XML Media
Types", RFC 3023, January 2001.
[RFC4288] Freed, N. and J. Klensin, "Media Type Specifications and
Registration Procedures", BCP 13, RFC 4288, December 2005.
[RFC4479] Rosenberg, J., "A Data Model for Presence", RFC 4479,
July 2006.
[RFC4480] Schulzrinne, H., Gurbani, V., Kyzivat, P., and J.
Rosenberg, "RPID: Rich Presence Extensions to the Presence
Information Data Format (PIDF)", RFC 4480, July 2006.
[RFC4482] Schulzrinne, H., "CIPID: Contact Information for the
Presence Information Data Format", RFC 4482, July 2006.
[I-D.ietf-simple-xml-patch-ops]
Urpalainen, J., "An Extensible Markup Language (XML) Patch
Operations Framework Utilizing XML Path Language (XPath)
Selectors", draft-ietf-simple-xml-patch-ops-04 (work in
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progress), November 2007.
[W3C.REC-xmlschema-2-20041028]
Malhotra, A. and P. Biron, "XML Schema Part 2: Datatypes
Second Edition", World Wide Web Consortium
Recommendation REC-xmlschema-2-20041028, October 2004,
<http://www.w3.org/TR/2004/REC-xmlschema-2-20041028>.
13.2. Informative references
[RFC2778] Day, M., Rosenberg, J., and H. Sugano, "A Model for
Presence and Instant Messaging", RFC 2778, February 2000.
[RFC3265] Roach, A., "Session Initiation Protocol (SIP)-Specific
Event Notification", RFC 3265, June 2002.
[RFC3859] Peterson, J., "Common Profile for Presence (CPP)",
RFC 3859, August 2004.
[I-D.ietf-simple-partial-notify]
Lonnfors, M., "Session Initiation Protocol (SIP) extension
for Partial Notification of Presence Information",
draft-ietf-simple-partial-notify-09 (work in progress),
February 2007.
[I-D.ietf-simple-presence-rules]
Rosenberg, J., "Presence Authorization Rules",
draft-ietf-simple-presence-rules-10 (work in progress),
July 2007.
Authors' Addresses
Mikko Lonnfors
Nokia
Itamerenkatu 11-13 00180
Helsinki
Finland
Phone: +358 71 8008000
Email: mikko.lonnfors@nokia.com
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Eva Leppanen
Individual
Lempaala
Finland
Email: eva.leppanen@saunalahti.fi
Hisham Khartabil
Ericsson Australia
P.O. Box 256c
Melbourne, VIC 3001
Australia
Email: hisham.khartabil@gmail.com
Jari Urpalainen
Nokia
Itamerenkatu 11-13 00180
Helsinki
Finland
Phone: +358 7180 37686
Email: jari.urpalainen@nokia.com
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Full Copyright Statement
Copyright (C) The IETF Trust (2007).
This document is subject to the rights, licenses and restrictions
contained in BCP 78, and except as set forth therein, the authors
retain all their rights.
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Lonnfors, et al. Expires May 22, 2008 [Page 17]