%% You should probably cite rfc8409 instead of this I-D.
@techreport{young-entity-category-04,
    number =    {draft-young-entity-category-04},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-young-entity-category/04/},
    author =    {Ian Young and Leif Johansson and Scott Cantor},
    title =     {{The Entity Category SAML Attribute Types }},
    pagetotal = 13,
    year =      2016,
    month =     may,
    day =       31,
    abstract =  {This document describes a SAML entity attribute which can be used to assign category membership semantics to an entity, and a second attribute for use in claiming interoperation with or support for entities in such categories. This document is a product of the Research and Education Federations (REFEDS) Working Group process.},
}