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Friday, October 19, 2007

Revised Civic Location Format for PIDF-LO

Members of the IETF Geographic Location/Privacy (GEOPRIV) Working Group
have released an updated version of "Revised Civic Location Format for
PIDF-LO." The work was produced within the IETF Real-time Applications
and Infrastructure Area. RFC 4119 "A Presence-based GEOPRIV Location
Object Format" defines a location object which extends the XML-based
Presence Information Data Format (PIDF), designed for communicating
privacy-sensitive presence information and which has similar properties.
RFC 4776 "Dynamic Host Configuration Protocol (DHCPv4 and DHCPv6)
Option for Civic Addresses Configuration Information" further defines
information about the country, administrative units such as states,
provinces, and cities, as well as street addresses, postal community
names, and building information. The option allows multiple renditions
of the same address in different scripts and languages. This document
("Revised Civic Location Format for PIDF-LO") augments the GEOPRIV civic
form to include the additional civic parameters captured in RFC 4776.
The document also introduces a hierarchical structure for thoroughfare
(road) identification which is employed in some countries. New elements
are defined to allow for even more precision in specifying a civic
location. The XML schema (Section 4, 'Civic Address Schema') defined
for civic addresses allows for the addition of the "xml:lang" attribute
to all elements except "country" and "PLC", which both contain
language-neutral values. The IETF GEOPRIV Working Group was chartered
to assess the authorization, integrity and privacy requirements that
must be met in order to transfer [location] information, or authorize
the release or representation of such information through an agent. As
more and more resources become available on the Internet, some
applications need to acquire geographic location information about
certain resources or entities. These applications include navigation,
emergency services, management of equipment in the field, and other
location-based services. But while the formatting and transfer of such
information is in some sense a straightforward process, the implications
of doing it, especially in regards to privacy and security, are
[underspecified]. Also in scope: authorization of requestors and
responders; authorization of proxies (for instance, the ability to
authorize a carrier to reveal what timezone one is in, but not what
city; an approach to the taxonomy of requestors, as well as to the
resolution or precision of information given them. More Information

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