%% You should probably cite draft-ietf-mediaman-suffixes instead of this I-D.
@techreport{w3cdidwg-media-types-with-multiple-suffixes-01,
    number =    {draft-w3cdidwg-media-types-with-multiple-suffixes-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-w3cdidwg-media-types-with-multiple-suffixes/01/},
    author =    {Amy Guy},
    title =     {{Media Types with Multiple Suffixes}},
    pagetotal = 4,
    year =      2021,
    month =     jan,
    day =       11,
    abstract =  {This document updates RFC 6838 "Media Type Specifications and Registration Procedures" to describe how to interpret subtypes with multiple suffixes.},
}