@misc{rfc4481,
    series =    {Request for Comments},
    number =    4481,
    howpublished =  {RFC 4481},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC4481},
    url =       {https://www.rfc-editor.org/info/rfc4481},
    author =    {Henning Schulzrinne},
    title =     {{Timed Presence Extensions to the Presence Information Data Format (PIDF) to Indicate Status Information for Past and Future Time Intervals}},
    pagetotal = 9,
    year =      2006,
    month =     jul,
    abstract =  {The Presence Information Data Format (PIDF) defines a basic XML format for presenting presence information for a presentity. This document extends PIDF, adding a timed status extension (\textless{}timed-status\textgreater{} element) that allows a presentity to declare its status for a time interval fully in the future or the past. {[}STANDARDS-TRACK{]}},
}