%% You should probably cite draft-ietf-simple-presence-rules instead of this I-D.
@techreport{ietf-simple-xcap-auth-usage-01,
    number =    {draft-ietf-simple-xcap-auth-usage-01},
    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-xcap-auth-usage/01/},
    author =    {Jonathan Rosenberg},
    title =     {{Extensible Markup Language (XML) Configuration Access Protocol (XCAP)Usages for Setting Presence Authorization}},
    pagetotal = 24,
    year =      2003,
    month =     oct,
    day =       29,
    abstract =  {This document describes three usages of the Extensible Markup Language (XML) Configuration Access Protocol (XCAP) that allow a client to provide authorization decisions regarding watchers of their presence. The first of these usages, called permission-statements, contains statements about what permissions are to be granted to watchers of presence. The second of these usages, called compound-permissions, allows a client to define new permissions as combinations of other defined permissions. The third usage, called supported-permissions, allows a client to determine what permissions are understood by the provider.},
}