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Requirements for a Location-by-Reference Mechanism
RFC 5808

Internet Engineering Task Force (IETF)                  R. Marshall, Ed.
Request for Comments: 5808                                           TCS
Category: Informational                                         May 2010
ISSN: 2070-1721

           Requirements for a Location-by-Reference Mechanism

Abstract

   This document defines terminology and provides requirements relating
   to the Location-by-Reference approach using a location Uniform
   Resource Identifier (URI) to handle location information within
   signaling and other Internet messaging.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   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).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see 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/rfc5808.

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.

Marshall                      Informational                     [Page 1]
RFC 5808                GEOPRIV LbyR Requirements               May 2010

   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 Contents

   1. Introduction ....................................................3
   2. Terminology .....................................................5
   3. Overview of Location-by-Reference ...............................6
      3.1. Location URI Usage .........................................7
      3.2. Location URI Expiration ....................................8
      3.3. Location URI Authorization .................................8
      3.4. Location URI Construction ..................................9
   4. High-Level Requirements .........................................9
      4.1. Requirements for a Location Configuration Protocol .........9
      4.2. Requirements for a Location Dereference Protocol ..........11
   5. Security Considerations ........................................12
   6. Acknowledgements ...............................................13
   7. References .....................................................13
      7.1. Normative References ......................................13
      7.2. Informative References ....................................13

Marshall                      Informational                     [Page 2]
RFC 5808                GEOPRIV LbyR Requirements               May 2010

1.  Introduction

   All location-based services rely on ready access to location
   information.  Location information can be used in either a direct,
   Location-by-Value (LbyV) approach or an indirect, Location-by-
   Reference (LbyR) approach.

   For LbyV, location information is conveyed directly in the form of a
   Presence Information Data Format Location Object (PIDF-LO) [RFC4119].
   Using LbyV might be either infeasible or undesirable in some
   circumstances.  There are cases where LbyR is better able to address
   location requirements for a specific architecture or application.
   This document provides a list of requirements for use with the LbyR
   approach, and leaves the LbyV model explicitly out of scope.

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