SIMPLE J. Rosenberg
Internet-Draft dynamicsoft
Expires: April 26, 2004 October 27, 2003
Extensible Markup Language (XML) Configuration Access Protocol (XCAP)
Usages for Setting Presence Authorization
draft-ietf-simple-xcap-auth-usage-01
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Copyright Notice
Copyright (C) The Internet Society (2003). All Rights Reserved.
Abstract
This document describes two usages of the Extensible Markup Language
(XML) Configuration Access Protocol (XCAP) that allow a client to
provide authorization decisions regarding watchers of their presence.
The first of these usages, called permission-statements, contains
statements about what permissions are to be granted to watchers of
presence. The second usage, called supported-permissions, allows a
client to determine what permissions are understood by the provider.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . 3
2. Structuring Presence Authorization . . . . . . . . . . . 4
3. Terminology . . . . . . . . . . . . . . . . . . . . . . 5
4. Permission Statements . . . . . . . . . . . . . . . . . 6
4.1 Application Unique ID . . . . . . . . . . . . . . . . . 6
4.2 Structure of Permission Statements . . . . . . . . . . . 6
4.2.1 Applying Statements to Watchers . . . . . . . . . . . . 6
4.2.2 Specifying Permissions . . . . . . . . . . . . . . . . . 8
4.2.2.1 Acceptance Permissions . . . . . . . . . . . . . . . . . 8
4.2.2.2 Content Permissions . . . . . . . . . . . . . . . . . . 10
4.2.2.2.1 Examples . . . . . . . . . . . . . . . . . . . . . . . . 11
4.3 Additional Constraints . . . . . . . . . . . . . . . . . 12
4.4 Naming Conventions . . . . . . . . . . . . . . . . . . . 12
4.5 Authorization Policies . . . . . . . . . . . . . . . . . 12
4.6 XML Schema . . . . . . . . . . . . . . . . . . . . . . . 13
5. Supported Permissions . . . . . . . . . . . . . . . . . 14
5.1 Application Unique ID . . . . . . . . . . . . . . . . . 14
5.2 Structure of Supported Permissions . . . . . . . . . . . 14
5.3 Naming Conventions . . . . . . . . . . . . . . . . . . . 15
5.4 Authorization Policies . . . . . . . . . . . . . . . . . 15
5.5 XML Schema . . . . . . . . . . . . . . . . . . . . . . . 16
5.6 Example Document . . . . . . . . . . . . . . . . . . . . 16
6. IANA Considerations . . . . . . . . . . . . . . . . . . 18
6.1 XCAP Application Usage IDs . . . . . . . . . . . . . . . 18
6.1.1 Permission Statements . . . . . . . . . . . . . . . . . 18
6.1.2 Supported Permissions . . . . . . . . . . . . . . . . . 18
6.2 URN Sub-Namespace Registrations . . . . . . . . . . . . 18
6.2.1 urn:ietf:params:xml:ns:permission-statements . . . . . . 18
6.2.2 urn:ietf:params:xml:ns:supported-permissions . . . . . . 19
6.3 XML Schema Registrations . . . . . . . . . . . . . . . . 20
6.3.1 Permissions Statements . . . . . . . . . . . . . . . . . 20
6.3.2 Supported Permissions . . . . . . . . . . . . . . . . . 20
Normative References . . . . . . . . . . . . . . . . . . 21
Informative References . . . . . . . . . . . . . . . . . 22
Author's Address . . . . . . . . . . . . . . . . . . . . 22
Intellectual Property and Copyright Statements . . . . . 23
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1. Introduction
The Session Initiation Protocol (SIP) for Instant Messaging and
Presence (SIMPLE) specifications allow a user, called a watcher, to
subscribe to another user, called a presentity [13], in order to
learn their presence information [14]. This subscription is handed by
a presence agent. In order to process the subscription, the presence
agent must make a determination about whether the subscription is
authorized. This authorization decision includes whether or not to
accept the subscription, but also includes decisions about when the
watcher should receive notifications, and when it does receive them,
what the content of those notifications should be.
Typically, the authorization decision will be a combination of the
authorization policies of the provider, combined with the
authorization policices of the presentity. In order for the PA to
compute the final authorization decision, it needs access to the
presentity's authorization policies.
In order to provide this access, the XML Configuration Access
Protocol (XCAP) [2] is used. XCAP allows a client to manipulate XML
documents stored on a server. Those XML documents represent per-user
provisioning data on how an application should operate. XCAP has the
notion of an application usage, which is a definition of the XML
schema used by a particular application, along with other relevant
information. Each application usage is given a unique application
usage ID (AUID) which identifies it. This specification makes use of
three application usages.
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2. Structuring Presence Authorization
This specification defines three application usages (each with their
own XML schema) that, put together, present a comprehensive solution
for allowing clients to specify authorization policies that a PA can
use when processing a subscription. The first of these application
usages has the AUID of permission-statements. This usage allows a
client to make statements about which permissions are granted to
which watchers. Each statement contains a definition of the watchers
to whom it applies, and then contains a list of permissions which are
granted to those watchers. The concept of a permission is central to
this specification. A permission is an atomic statement of consent. A
permission can indicate a condition under which a subscription is
accepted or rejected, a condition under which a notification is or is
not sent, or a piece of information which is revealed in a presence
document. The overall authorization for a watcher is represented by
the union of the permissions granted to that watcher.
This specification contains a basic set of primitive permissions. It
is anticipated that new ones will be standardized in the future. It
is also anticipated that vendors will define proprietary permissions.
In order for a client to connect to a server, and achieve
interoperability, it is neccesary for the client to know what
permissions are supported by the server. The second application
usage, supported-permissions, allows a client to read the list of
permissions understood by the server.
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3. Terminology
In this document, the key words "MUST", "MUST NOT", "REQUIRED",
"SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY",
and "OPTIONAL" are to be interpreted as described in RFC 2119 [1] and
indicate requirement levels for compliant implementations.
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4. Permission Statements
4.1 Application Unique ID
XCAP requires application usages to define a unique application usage
ID (AUID) in either the IETF tree or a vendor tree. This
specification defines the "permission-statements" AUID within the
IETF tree, via the IANA registration in Section 6.
4.2 Structure of Permission Statements
A permission statement is an XML [3] document that MUST be
well-formed and SHOULD be valid. Permission statement documents MUST
be based on XML 1.0 and MUST be encoded using UTF-8. This
specification makes use of XML namespaces for identifying permission
statement documents and document fragments. The namespace URI for
elements defined for this purpose is a URN [5], using the namespace
identifier 'ietf' defined by [7] and extended by [11]. This URN is:
urn:ietf:params:xml:ns:permission-statements
A permission statement document begins with the root element tag
"permission-statements". It consists of any number of "statement"
elements. Each statement element defines a set of permissions and
identifies to whom they are granted.
Each "statement" element has a single attribute:
id: This is a string which serves as a way to uniquely identify
statements in the document. The attribute MUST be unique amongst
all statement elements in the document. This attribute is
mandatory.
Each statement is composed of a single "applies-to" element and a
single "permissions" element. The "permissions" element is composed
of one or more elements that grant permissions.
4.2.1 Applying Statements to Watchers
The "applies-to" element defines the set of watchers to whom the
statement applies. It contains one or more "uri" elements, "domain"
elements, "on-list" elements or a single "any" element, followed by
any number of "except" elements. The "uri" element identifies a
single watcher by specifying its URI. The "domain" element says that
the statement applies to all watchers from the specified domain. The
"on-list" element says that the statement applies to all users on the
specified presence list [17], identified with an HTTP URI that points
to the list. Finally, the "any" element says that the statement
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applies to all watchers. Additional elements can be added that
express other ways of identifying the watchers to whom the statement
applies. When unioned together, the result of the "uri", "domain",
"on-list" and "any" elements define a set of users to whom the
permission statement applies. This list is reduced in size by the
"except" element, which removes a user or domain from the set. The
"except" element contains instances of the "uri", "domain" and
"on-list" elements, which specify the users, domains, lists to be
removed from the set.
The "uri", "domain", "on-list", and "any" elements all have the
following attributes:
id: This is a string which serves as a way to uniquely identify an
instance of this element within the enclosing "applies-to"
element. The attribute MUST be unique amongst all elements of the
same name within the enclosing "applies-to" element. This
attribute is mandatory.
display-name: This is a string that contains a display name, suitable
for rendering to a human user, the identity of the user or domain
implied by the element. This attribute is optional.
lang: This attribute identifies the language used to represent the
display name. It is imported from the XML namespace. This
attribute is optional.
When a subscription arrives at the PA, the PA performs an
authentication operation to determine the identity of the watcher. It
then uses the "applies-to" element in each statement within the
presentity's document, and determines the set of statements that
apply to the watcher. It is possible that multiple statements can
match a single subscription. In that case, the union of the
permissions across those statements is applied to the subscription.
It is also possible that none of the statements match, in which case
the subscription is considered "pending".
For example, the following XML fragment includes two statements, one
that applies to the user joe@example.com, and another that applies to
example.com. When Joe subscribes, both statements match. Therefore,
he is granted the union of the permissions across the two statements.
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<?xml version="1.0" encoding="UTF-8"?>
<permission-statements>
<statement id="as8f">
<applies-to>
<uri>sip:joe@example.com</uri>
</applies-to>
<permissions>
<!-- permissions for joe go here -->
</permissions>
</statement>
<statement id="kgg8a">
<applies-to>
<domain>example.com</domain>
</applies-to>
<permissions>
<!-- permissions for example.com go here -->
</permissions>
</statement>
</permission-statements>
4.2.2 Specifying Permissions
The remainder of the content of the "statement" element contains
specific permissions that are granted to watchers to whom the
statement applies. Each permission is represented by a single XML
element.
Primitive permissions can be grouped into two categories:
1. Acceptance permissions allow the watcher to subscribe. Without an
acceptance permission, a subscription is rejected outright.
2. Content permissions indicate which information the watcher is
permitted to see, in the event a notification is sent in the
first place (based on the rule permissions).
4.2.2.1 Acceptance Permissions
Acceptance permissions grant the ability of the watcher to subscribe
to the presentity. Without an acceptance permission, none of the
other permissions make any sense. There are only two primitive
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acceptance permissions, each of which is an XML element. These are
"accept" and "accept-if". The "accept" element has no content and no
attributes. It simply grants permission to the watcher to subscribe.
Only one such element can be present in any statement. The
"accept-if" element also grants permission to subscribe, but the
granting of this permissions is predicated on some condition. The
content of the "accept-if" element is a condition element. Condition
elements describe characteristics of the subscription, or of the
operating environment of the server, which are either true or false.
If the condition within the "accept-if" element is true, an
acceptance permission is granted.
The following represent the conditions which can be checked:
auth-mechanism: This element contains an enumerated type that
describes authentication mechanisms. The defined values are none,
digest (referring to the HTTP digest [8] mechanism used in RFC
3261 [9]), smime (referring to SIP's S/MIME authentication), tls
(meaning that the watcher authenticated themself using a client
certificate in a mutual TLS exchange with the server), and
p-asserted-id (as defined in RFC 3325 [16]). The condition
evaluates to true if the client was authenticated using the listed
algorithm.
anonymous: This element contains no values. The condition evaluates
to true if the watcher is anonymous. They are considered anonymous
if the From header field of the request is equal to "Anonymous".
Note that a user can be anonymous and also have authenticated
themselves with digest. This occurs when the "anonymous" username
and password, as defined in RFC 3261 [9], are used.
can-encrypt: This element contains no values. The condition evaluates
to true if it is possible to encrypt, using S/MIME, notifications
sent to this watcher. Generally, this can be determined when the
Accept header field in the subscription indicates support for the
application/pkcs7-mime [10] MIME type.
As an example, the following statement grants permission for watcher
sip:joe@example.com to subscribe if he authenticates with digest:
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<?xml version="1.0" encoding="UTF-8"?>
<permission-statements>
<statement id="as8f">
<applies-to>
<uri>sip:joe@example.com</uri>
</applies-to>
<permissions
<accept-if>
<auth-mechanism>digest</auth-mechanism>
</accept-if>
</permissions>
</statement>
</permission-statements>
4.2.2.2 Content Permissions
Content permissions specify the information that is to be sent to a
watcher. Each permission specifies a piece of information that is to
be sent, or to be used in general in the computation of the presence
document. The defined permissions are:
all-content: This permission specifies that all presence information
can be sent. The element has no attributes or value.
show-contact-element: This permission specifies that the contact
component of the tuple can be sent. The element has no attributes
or value.
show-note: This permission specifies that the note component of the
tuple can be sent. The element has no attributes or value.
show-tuple: This permission specifies that the identified tuples can
be sent to the watcher. The element has no attributes. Its content
is a string that matches the "class" element present within the
tuple [12].
show-element: This permission specifies that the XML element
identified by "show-element" can be presented to the watcher. The
content of "show-element" is a qualified element name. When
present, it that the specified element, if present in any
published documents from publishers, can be used by the presence
server and then distributed to watchers.
show-namespace: This permission specifies that elements and
attributes in the presence document within the specified namespace
can be presented to the watcher. When present, it that content
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from the specified element, if present in any published documents
from publishers, can be used by the presence server and then
distributed to watchers.
encrypt: This permission specifies that the presence document should
be sent to the watcher encrypted. It should never be present in a
statement without the presence of an "accept-if" element which
conditions acceptance of the subscription on the ability of the
watcher to receive encrypted presence documents.
4.2.2.2.1 Examples
The following example specifies that a watcher is only allowed to see
baseline pidf information:
<?xml version="1.0" encoding="UTF-8"?>
<permission-statements
xmlns:pidf="urn:ietf:params:xml:ns:pidf">
<statement id="as8f">
<applies-to>
<uri>sip:joe@example.com</uri>
</applies-to>
<permissions>
<accept/>
<show-namespace>urn:ietf:params:xml:ns:pidf</show-namespace>
</permissions>
</statement>
</permission-statements>
The following example shows that the watcher is allowed to see PIDF
information along with the placetype element from RPIDS:
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<?xml version="1.0" encoding="UTF-8"?>
<permission-statements
xmlns:pidf="urn:ietf:params:xml:ns:pidf"
xmlns:rpids="urn:ietf:params:xml:ns:sip-rpids">
<statement id="as8f">
<applies-to>
<uri>sip:joe@example.com</uri>
</applies-to>
<permissions>
<accept/>
<show-namespace>urn:ietf:params:xml:ns:pidf</show-namespace>
<show-element>rpids:placetype</show-element>
</permissions>
</statement>
</permission-statements>
4.3 Additional Constraints
The following are additional constraints not described by the schema:
o The content of a "show-element" element indicates the name of an
XML element, and may be fully qualified (i.e., prefixed with a
namespace identifier followed by a colon).
o The value of the "domain" element MUST be compliant to the BNF for
"host" as defined in RFC 3261 [9].
o The value of the "on-list" element MUST be a valid HTTP URI that
represents a presence list, as defined in [17].
o TODO: Complete this list.
4.4 Naming Conventions
When a presence agent receives a subscription for some user foo
within a domain, it will look for all documents within http://[xcap
root services uri]/permission-statements/users/foo, and use all
documents found beneath that point to guide authorization policy.
4.5 Authorization Policies
This application usage does not modify the default XCAP authorization
policy, which is that only a user can read, write or modify their own
documents. A server can allow priveleged users to modify documents
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that they don't own, but the establishment and indication of such
policies is outside the scope of this document.
4.6 XML Schema
]]>
TODOS: need to add points of extensibility.
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5. Supported Permissions
Supported permissions allow a presentity to determine what the
capabilities of the PA are, in terms of expressing authorization
policy. This capability is expressed as a list of primitive
permissions, primitive conditions, and compound permissions. When a
client starts up, it reads this set of permissions from a well known
URI (see Section 5.3). It then knows which permissions, both
primitive and compound, that it can include in its permission
statements.
5.1 Application Unique ID
XCAP requires application usages to define a unique application usage
ID (AUID) in either the IETF tree or a vendor tree. This
specification defines the "supported-permissions" AUID within the
IETF tree, via the IANA registration in Section 6.
5.2 Structure of Supported Permissions
A supported permission is an XML [3] document that MUST be
well-formed and SHOULD be valid. Supported permission documents MUST
be based on XML 1.0 and MUST be encoded using UTF-8. This
specification makes use of XML namespaces for identifying supported
permission documents and document fragments. The namespace URI for
elements defined for this purpose is a URN [5], using the namespace
identifier 'ietf' defined by [7] and extended by [11]. This URN is:
urn:ietf:params:xml:ns:supported-permissions
A supported permission document begins with the root element tag
"supported-permissions". It consists of one "primitive-permissions"
element, and zero or one "conditions" elements.
The "primitive-permissions" element has, for its content, a
"permissions" element. This element contains a valid permission
statement which purposefully includes all primitive permissions that
are supported by the server. All PA's which allow for xcap-based
configuration of authorization MUST support, at a minimum, the
"accept", and "all-content" primitive permissions.
The "conditions" element contains a sequence of conditions which can
be used within the "accept-if" element. Clearly, the "conditions"
element will not be present if "accept-if" is not listed as a
supported permission. There is no minimum requirement for a PA in
terms of the conditions that need to be supported.
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5.3 Naming Conventions
When a client starts, it can fetch the permissions understood by the
server in one of two places. If the server capabilities differ on a
user by user basis, the supported permissions for user foo can be
found in http://[xcap root services uri]/supported-permissions/users/
foo/sp.xml. A client SHOULD check this file first. If this document
doesn't exist, the client should next check for the system wide
permissions by checking http://[xcap root services uri]/
supported-permissions/global/sp.xml.
5.4 Authorization Policies
This application usage does not modify the default XCAP authorization
policy, which is that only a user can read, write or modify their own
documents. A server can allow priveleged users to modify documents
that they don't own, but the establishment and indication of such
policies is outside the scope of this document.
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5.5 XML Schema
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema
targetNamespace="urn:ietf:params:xml:ns:supported-permissions"
xmlns:ps="urn:ietf:params:xml:ns:permission-statements"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
elementFormDefault="qualified"
attributeFormDefault="unqualified">
<xs:import namespace="urn:ietf:params:xml:ns:permission-statements"/>
<xs:element name="supported-permissions">
<xs:complexType>
<xs:sequence>
<xs:element name="primitive-permissions">
<xs:complexType>
<xs:sequence>
<xs:element name="permissions" type="ps:permissionsType"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="conditions" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:element name="condition" type="xs:string"
maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>
5.6 Example Document
This example document describes a PA that allows very simple
primitive types. Instead, it defines several compound ones that are
the preferred way for clients to express permissions.
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<?xml version="1.0" encoding="UTF-8"?>
<supported-permissions
xmlns:ps="urn:ietf:params:xml:ns:permission-statements"
elementFormDefault="qualified"
attributeFormDefault="unqualified">
<primitive-permissions>
<permissions>
<accept/>
<all-content/>
<show-element>example</show-element>
</permissions>
</primitive-permissions>
</supported-permissions>
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6. IANA Considerations
There are several IANA considerations associated with this
specification.
6.1 XCAP Application Usage IDs
This section registers three XCAP Application Usage IDs (AUID)
according to the IANA procedures defined in [2].
6.1.1 Permission Statements
Name of the AUID: permission-statements
Description: Permission-statements are documents that describe the
permissions that a presentity [13] has granted to users that seek
to watch their presence.
6.1.2 Supported Permissions
Name of the AUID: supported-permissions
Description: Supported permissions are documents that describe the
types of permissions which are supported by a presence agent [14].
These permissions specify the information that watchers [13] of
presence are allowed to see.
6.2 URN Sub-Namespace Registrations
This section registers several new XML namespaces, as per the
guidelines in [11]
6.2.1 urn:ietf:params:xml:ns:permission-statements
URI: The URI for this namespace is
urn:ietf:params:xml:ns:permission-statements.
Registrant Contact: IETF, SIMPLE working group, (simple@ietf.org),
Jonathan Rosenberg (jdrosen@jdrosen.net).
XML:
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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>Permission Statements Namespace</title>
</head>
<body>
<h1>Namespace for Permission Statements</h1>
<h2>urn:ietf:params:xml:ns:permission-statements</h2>
<p>See <a href="[[[URL of published RFC]]]">RFCXXXX</a>.</p>
</body>
</html>
END
6.2.2 urn:ietf:params:xml:ns:supported-permissions
URI: The URI for this namespace is
urn:ietf:params:xml:ns:supported-permissions.
Registrant Contact: IETF, SIMPLE working group, (simple@ietf.org),
Jonathan Rosenberg (jdrosen@jdrosen.net).
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>Supported Permissions Namespace</title>
</head>
<body>
<h1>Namespace for Supported Permissions</h1>
<h2>urn:ietf:params:xml:ns:supported-permissions</h2>
<p>See <a href="[[[URL of published RFC]]]">RFCXXXX</a>.</p>
</body>
</html>
END
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6.3 XML Schema Registrations
This section registers three XML schemas as per the procedures in
[11].
6.3.1 Permissions Statements
URI: please assign.
Registrant Contact: IETF, SIMPLE working group, (simple@ietf.org),
Jonathan Rosenberg (jdrosen@jdrosen.net).
The XML for this schema can be found as the sole content of
Section 4.6.
6.3.2 Supported Permissions
URI: please assign.
Registrant Contact: IETF, SIMPLE working group, (simple@ietf.org),
Jonathan Rosenberg (jdrosen@jdrosen.net).
The XML for this schema can be found as the sole content of
Section 5.5.
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Normative References
[1] Bradner, S., "Key words for use in RFCs to Indicate Requirement
Levels", BCP 14, RFC 2119, March 1997.
[2] Rosenberg, J., "The Extensible Markup Language (XML)
Configuration Access Protocol (XCAP)",
draft-ietf-simple-xcap-00 (work in progress), June 2003.
[3] Bray, T., Paoli, J., Sperberg-McQueen, C. and E. Maler,
"Extensible Markup Language (XML) 1.0 (Second Edition)", W3C
REC REC-xml-20001006, October 2000.
[4] Clark, J. and S. DeRose, "XML Path Language (XPath) Version
1.0", W3C REC REC-xpath-19991116, November 1999.
[5] Moats, R., "URN Syntax", RFC 2141, May 1997.
[6] Murata, M., St. Laurent, S. and D. Kohn, "XML Media Types", RFC
3023, January 2001.
[7] Moats, R., "A URN Namespace for IETF Documents", RFC 2648,
August 1999.
[8] Franks, J., Hallam-Baker, P., Hostetler, J., Lawrence, S.,
Leach, P., Luotonen, A. and L. Stewart, "HTTP Authentication:
Basic and Digest Access Authentication", RFC 2617, June 1999.
[9] Rosenberg, J., Schulzrinne, H., Camarillo, G., Johnston, A.,
Peterson, J., Sparks, R., Handley, M. and E. Schooler, "SIP:
Session Initiation Protocol", RFC 3261, June 2002.
[10] Ramsdell, B., "S/MIME Version 3 Message Specification", RFC
2633, June 1999.
[11] Mealling, M., "The IETF XML Registry",
draft-mealling-iana-xmlns-registry-05 (work in progress), June
2003.
[12] Schulzrinne, H., "RPID -- Rich Presence Information Data
Format", draft-ietf-simple-rpid-00 (work in progress), July
2003.
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Informative References
[13] Day, M., Rosenberg, J. and H. Sugano, "A Model for Presence and
Instant Messaging", RFC 2778, February 2000.
[14] Rosenberg, J., "A Presence Event Package for the Session
Initiation Protocol (SIP)", draft-ietf-simple-presence-10 (work
in progress), January 2003.
[15] Sugano, H. and S. Fujimoto, "Presence Information Data Format
(PIDF)", draft-ietf-impp-cpim-pidf-08 (work in progress), May
2003.
[16] Jennings, C., Peterson, J. and M. Watson, "Private Extensions
to the Session Initiation Protocol (SIP) for Asserted Identity
within Trusted Networks", RFC 3325, November 2002.
[17] Rosenberg, J., "An Extensible Markup Language (XML)
Configuration Access Protocol (XCAP) Usage for Presence
Lists", draft-ietf-simple-xcap-list-usage-00 (work in
progress), June 2003.
Author's Address
Jonathan Rosenberg
dynamicsoft
600 Lanidex Plaza
Parsippany, NJ 07052
US
Phone: +1 973 952-5000
EMail: jdrosen@dynamicsoft.com
URI: http://www.jdrosen.net
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Rosenberg Expires April 26, 2004 [Page 24]
