Network Working Group T. Hardie
Request for Comments: 5222 Qualcomm, Inc.
Category: Standards Track A. Newton
American Registry for Internet Numbers
H. Schulzrinne
Columbia University
H. Tschofenig
Nokia Siemens Networks
August 2008
LoST: A Location-to-Service Translation Protocol
Status of This Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
Abstract
This document describes an XML-based protocol for mapping service
identifiers and geodetic or civic location information to service
contact URIs. In particular, it can be used to determine the
location-appropriate Public Safety Answering Point (PSAP) for
emergency services.
Table of Contents
1. Introduction .................................................. 3
2. Terminology and Requirements Notation ......................... 4
3. Overview of Protocol Usage .................................... 5
4. LoST Servers and Their Resolution ............................ 6
5. The <mapping> Element ........................................ 7
5.1. The Mapping Data Source: 'source', 'sourceId', and
'lastUpdated' Attributes .................................. 7
5.2. Mapping Validity: The 'expires' Attribute ................ 8
5.3. Describing the Service with the <displayName> Element .... 8
5.4. The Mapped Service: The <service> Element ................. 8
5.5. Defining the Service Region with the <serviceBoundary>
Element .................................................. 9
5.6. Service Boundaries by Reference: The
<serviceBoundaryReference> Element ........................ 9
5.7. The Service Number: The <serviceNumber> Element ......... 10
5.8. Service URLs: The <uri> Element ......................... 10
Hardie, et al. Standards Track [Page 1]RFC 5222 LoST August 2008
6. Path of a Request: The <path> Element ....................... 10
7. Identifying the Location Element Used for Mapping:
<locationUsed> ............................................... 11
8. Mapping a Location and Service to URLs: <findService> ....... 11
8.1. Overview ................................................. 11
8.2. Examples ................................................. 11
8.2.1. Example Using Geodetic Coordinates ................... 11
8.2.2. Civic Address Mapping Example ....................... 13
8.3. Components of the <findService> Request ................. 15
8.3.1. The <location> Element ............................... 15
8.3.2. Identifying the Service: The <service> Element ..... 16
8.3.3. Recursion and Iteration ............................. 16
8.3.4. Service Boundary ..................................... 16
8.3.5. Requesting Civic Location Validation ................. 16
8.4. Components of the Mapping Response
<findServiceResponse> ................................... 18
8.4.1. Overview ............................................. 18
8.4.2. Civic Address Validation: The <locationValidation>
Element ............................................. 19
9. Retrieving the Service Boundary via <getServiceBoundary> ..... 19
10. List Services: <listServices> ............................... 21
11. List Services By Location: <listServicesByLocation> ......... 22
12. Location Profiles ........................................... 24
12.1. Location Profile Usage ................................... 25
12.2. Two-Dimensional Geodetic Profile ......................... 30
12.3. Basic Civic Profile ..................................... 31
13. Errors, Warnings, and Redirects ............................. 32
13.1. Errors ................................................... 32
13.2. Warnings ................................................. 34
13.3. Redirects ............................................... 36
14. LoST Transport: HTTP ......................................... 36
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