%% You should probably cite rfc9100 instead of this I-D.
@techreport{ietf-core-senml-versions-03,
    number =    {draft-ietf-core-senml-versions-03},
    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-core-senml-versions/03/},
    author =    {Carsten Bormann},
    title =     {{SenML Features and Versions}},
    pagetotal = 7,
    year =      2021,
    month =     may,
    day =       9,
    abstract =  {This short document updates RFC 8428, Sensor Measurement Lists (SenML), by specifying the use of independently selectable "SenML Features" and mapping them to SenML version numbers.},
}