@misc{rfc5263,
    series =    {Request for Comments},
    number =    5263,
    howpublished =  {RFC 5263},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC5263},
    url =       {https://www.rfc-editor.org/info/rfc5263},
    author =    {Hisham Khartabil and Jose Costa-Requena and Eva Leppanen and Mikko Lonnfors},
    title =     {{Session Initiation Protocol (SIP) Extension for Partial Notification of Presence Information}},
    pagetotal = 16,
    year =      2008,
    month =     sep,
    abstract =  {By default, presence delivered using the presence event package for the Session Initiation Protocol (SIP) is represented in the Presence Information Data Format (PIDF). A PIDF document contains a set of elements, each representing a different aspect of the presence being reported. When any subset of the elements change, even just a single element, a new document containing the full set of elements is delivered. This memo defines an extension allowing delivery of only the presence data that has actually changed. {[}STANDARDS-TRACK{]}},
}