%% You should probably cite draft-ietf-netmod-immutable-flag instead of this I-D.
@techreport{ma-netmod-immutable-flag-09,
    number =    {draft-ma-netmod-immutable-flag-09},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-ma-netmod-immutable-flag/09/},
    author =    {Qiufang Ma and Qin Wu and Balázs Lengyel and Hongwei Li},
    title =     {{YANG Metadata Annotation for Immutable Flag}},
    pagetotal = 19,
    year =      2023,
    month =     oct,
    day =       22,
    abstract =  {This document defines a way to formally document existing behavior, implemented by servers in production, on the immutability of some system configuration nodes, using a YANG metadata annotation called "immutable" to flag which nodes are immutable. Clients may use "immutable" annotations provided by the server, to know beforehand why certain otherwise valid configuration requests will cause the server to return an error. The immutable flag is descriptive, documenting existing behavior, not proscriptive, dictating server behavior.},
}