SIMPLE                                                      J. Rosenberg
Internet-Draft                                               dynamicsoft
Expires: January 17, 2005                                  July 19, 2004


   An Extensible Markup Language (XML) Representation for Expressing
                      Presence Policy Capabilities
               draft-rosenberg-simple-pres-policy-caps-01

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   Copyright (C) The Internet Society (2004).  All Rights Reserved.

Abstract

   An important component of presence services is policy.  Policy
   systems allow the presentity to grant access to specific pieces of
   information to specific watchers.  To allow for interoperability
   between clients which set such policies, and servers which execute
   them, it is necessary for clients to be able to determine the
   capabilities of the server to which it is connected.  This
   specification defines a set of Extensible Markup Language (XML)
   elements for expressing presence policy capabilities.




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Table of Contents

   1.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  Structure of Presence Policy Capabilities  . . . . . . . . . .  3
   4.  XML Schema . . . . . . . . . . . . . . . . . . . . . . . . . .  4
   5.  Example Document . . . . . . . . . . . . . . . . . . . . . . .  4
   6.  Security Considerations  . . . . . . . . . . . . . . . . . . .  5
   7.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  5
     7.1   URN Sub-Namespace Registrations  . . . . . . . . . . . . .  5
     7.2   XML Schema Registration  . . . . . . . . . . . . . . . . .  5
   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . .  6
   8.1   Normative References . . . . . . . . . . . . . . . . . . . .  6
   8.2   Informative References . . . . . . . . . . . . . . . . . . .  6
       Author's Address . . . . . . . . . . . . . . . . . . . . . . .  6
       Intellectual Property and Copyright Statements . . . . . . . .  7



































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1.  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 [3] and
   indicate requirement levels for compliant implementations.

2.  Introduction

   An important component of presence [5] is policy.  Policy systems
   allow the presentity to grant access to specific pieces of
   information to specific watchers.  These policy systems can be
   extremely simple or extremely complex.  For this reason [1] defines a
   generic Extensible Markup Language (XML) based format for
   representing policy capabilities.  That format applies to many
   services, including location and presence.  This specification
   extends that one by defining policy capabilities specific to
   presence.  Those policy capabilities correspond to the conditions,
   actions and transformations defined in [2].

3.  Structure of Presence Policy Capabilities

   [1] defines the structure of common policy capability documents.  In
   that specification, each policy capability document has three
   components - a list of supported conditions, a list of supported
   actions, and a list of supported transformations.  This specification
   merely extends that document with the conditions, actions and
   transformations defined in [2].  It does so by defining six empty
   elements - "anonymous", "accept-subscription", "provide-presence",
   "show-namespace", "show-tuple", "show-element" - each of which
   indicates whether the respective attribute in [2] is supported.  All
   of these elements are defined within the namespace:
      urn:ietf:params:xml:ns:supported-pres-permissions


















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4.  XML Schema


   <?xml version="1.0" encoding="UTF-8"?>
   <xs:schema
   targetNamespace="urn:ietf:params:xml:ns:supported-pres-permissions"
   xmlns:pc="urn:ietf:params:xml:ns:supported-pres-permissions"
   xmlns:cc="urn:ietf:params:xml:ns:supported-permissions"
   xmlns:xs="http://www.w3.org/2001/XMLSchema"
   elementFormDefault="qualified" attributeFormDefault="unqualified">
   <xs:import namespace="urn:ietf:params:xml:ns:supported-permissions"/>
   <xs:element name="anonymous" substitutionGroup="cc:condition"/>
   <xs:element name="accept-subscription" substitutionGroup="cc:action"/>
   <xs:element name="provide-presence" substitutionGroup="cc:action"/>
   <xs:element name="show-namespace" substitutionGroup="cc:transformation"/>
   <xs:element name="show-element" substitutionGroup="cc:transformation"/>
   <xs:element name="show-tuple" substitutionGroup="cc:transformation"/>
   </xs:schema>


5.  Example Document

   The following document indicates that the identity, validity, sphere
   and confirmation attributes are supported.  It also indicates that a
   vendor-specific condition, called "temp", is supported, in addition
   to two vendor-specific transformations - "max-security" and
   "min-security".  The "show-tuple" element is also supported.


   <?xml version="1.0" encoding="UTF-8"?>
   <supported-permissions
   xmlns="urn:ietf:params:xml:ns:supported-permissions"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xmlns:vpp="http://www.vendor.com/extension1"
   xmlns:pc="urn:ietf:params:xml:ns:supported-pres-permissions">
     <conditions>
       <identity/>
       <validity/>
       <sphere/>
       <vpp:temp/>
     </conditions>
     <actions>
       <confirmation/>
     </actions>
     <transformations>
       <vpp:min-security/>
       <vpp:max-security/>
       <pc:show-tuple/>



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     </transformations>
   </supported-permissions>

6.  Security Considerations

   This specification does not introduce any new security considerations
   beyond those discussed in [1].

7.  IANA Considerations

   There are several IANA considerations associated with this
   specification.

7.1  URN Sub-Namespace Registrations

   This section registers a new XML namespace, as per the guidelines in
   [4]
      URI: The URI for this namespace is
      urn:ietf:params:xml:ns:supported-pres-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 Presence Permissions Namespace</title>
                </head>
                <body>
                  <h1>Namespace for Supported Permissions</h1>
                  <h2>urn:ietf:params:xml:ns:supported-pres-permissions</h2>
                  <p>See <a href="[[[URL of published RFC]]]">RFCXXXX</a>.</p>
                </body>
                </html>
                END


7.2  XML Schema Registration

   This section registers an XML schema as per the procedures in [4].





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      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.

8.  References

8.1  Normative References

   [1]  Rosenberg, J., "An Extensible Markup Language (XML)
        Representation for Expressing Policy Capabilities",
        draft-rosenberg-simple-common-policy-caps-00 (work in progress),
        February 2004.

   [2]  Rosenberg, J., "Presence Authorization Rules",
        draft-rosenberg-simple-rules-00 (work in progress), February
        2004.

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

   [4]  Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688, January
        2004.

8.2  Informative References

   [5]  Day, M., Rosenberg, J. and H. Sugano, "A Model for Presence and
        Instant Messaging", RFC 2778, February 2000.


Author's Address

   Jonathan Rosenberg
   dynamicsoft
   600 Lanidex Plaza
   Parsippany, NJ  07054
   US

   Phone: +1 973 952-5000
   EMail: jdrosen@dynamicsoft.com
   URI:   http://www.jdrosen.net









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Acknowledgment

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   Internet Society.




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