%% You should probably cite rfc4661 instead of this I-D.
@techreport{ietf-simple-filter-format-05,
    number =    {draft-ietf-simple-filter-format-05},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-ietf-simple-filter-format/05/},
    author =    {Jose Costa-Requena and Hisham Khartabil and Eva Leppanen and Mikko Lonnfors},
    title =     {{An Extensible Markup Language (XML)-Based Format for Event Notification Filtering}},
    pagetotal = 24,
    year =      2005,
    month =     mar,
    day =       16,
    abstract =  {The SIP event notification framework describes the usage of the Session Initiation Protocol (SIP) for subscriptions and notifications of changes to a state of a resource. The document does not describe a mechanism whereby filtering of event notification information can be achieved. Filtering is a mechanism for defining the preferred notification information to be delivered and for specifying triggers that cause that information to be delivered. In order to enable this, a format is needed to enable the subscriber to describe the state changes of a resource that cause notifications to be sent to it and what those notifications are to contain. This document presents a format in the form of an XML document. {[}STANDARDS-TRACK{]}},
}