Dynamic Extensions to the Presence Information Data Format Location Object (PIDF-LO)
RFC 5962

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Internet Engineering Task Force (IETF)                    H. Schulzrinne
Request for Comments: 5962                                      V. Singh
Category: Standards Track                            Columbia University
ISSN: 2070-1721                                            H. Tschofenig
                                                  Nokia Siemens Networks
                                                              M. Thomson
                                                      Andrew Corporation
                                                          September 2010

       Dynamic Extensions to the Presence Information Data Format
                       Location Object (PIDF-LO)

Abstract

   The Geopriv Location Object introduced by the Presence Information
   Data Format - Location Object (PIDF-LO), RFC 4119, defines a basic
   XML format for carrying geographical information of a presentity.
   This document defines PIDF-LO extensions to convey information about
   moving objects.  Elements are defined that enable expression of
   spatial orientation, speed, and heading of the presentity.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc5962.

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RFC 5962              Dynamic Extensions to PIDF-LO       September 2010

Copyright Notice

   Copyright (c) 2010 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (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.

Table of Contents

   1. Introduction ....................................................2
   2. Terminology .....................................................3
   3. Dynamic Elements ................................................3
      3.1. Angular Measures and Coordinate Reference Systems ..........5
   4. Dynamic Feature XML Schema ......................................6
   5. Security Considerations .........................................7
   6. IANA Considerations .............................................7
      6.1. Dynamic Feature Extensions Namespace Registration ..........7
      6.2. Dynamic Feature Extensions Schema Registration .............8
   7. Acknowledgements ................................................8
   8. References ......................................................9
      8.1. Normative References .......................................9
      8.2. Informative References .....................................9
   Appendix A.  Earth Centered, Earth Fixed Direction Vectors ........10

1.  Introduction

   The Presence Information Data Format - Location Object (PIDF-LO) (see
   RFC 4119 [RFC4119]) provides geographical location of a presentity.
   This corresponds to a physical location at a given instance of time.
   RFC 5491 [RFC5491] extends PIDF-LO and provides additional guidelines
   to implementers.

   This document extends PIDF-LO to convey spatial orientation, speed,
   and heading of a presentity.  The addition of rate-of-change
   information to the PIDF-LO enables a range of use cases.  These use
   cases either use dynamic information directly or use that information

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RFC 5962              Dynamic Extensions to PIDF-LO       September 2010

   for smoother tracking of a position over time.  For example, an
   application that continuously tracks a presentity could use velocity
   information to extrapolate positions in between times that location
   information is measured.  A shipping company could directly use speed
   to monitor delivery truck speed to ensure speed limits are observed.

2.  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
   [RFC2119].

   This document uses the term "presentity", as defined in RFC 2778