<http://tools.ietf.org/html/rfc5962>
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.
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