@techreport{kang-keyword-requirement-level-00,
    number =    {draft-kang-keyword-requirement-level-00},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-kang-keyword-requirement-level/00/},
    author =    {Duekyoon Kang and Shin Fang},
    title =     {{Guide lines for Key words use to indicate requirement levels in RFCs}},
    pagetotal = 2,
    year =      1998,
    month =     mar,
    day =       11,
    abstract =  {In many IETF documents several key words are used to signify the requirements in the spefcification. This document defines the requirement levels imposed by these words as they should be interpreted in IETF documments. The requirement levels are basically equivalent to the ones proposed by RFC 2119{[}1{]}. But easier to understand the strength of key words and to introduce new key words to the hierarchy of requirement levels if ever there's a need.},
}