%% You should probably cite draft-ietf-dnsop-attrleaf instead of this I-D.
@techreport{crocker-dns-attrleaf-07,
    number =    {draft-crocker-dns-attrleaf-07},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-crocker-dns-attrleaf/07/},
    author =    {Dave Crocker},
    title =     {{DNS Scoped Data Through '\_Underscore' Attribute Leaves}},
    pagetotal = 13,
    year =      2015,
    month =     nov,
    day =       14,
    abstract =  {Historically, any DNS RR may occur for any domain name. Recent additions have defined DNS leaf nodes that contain a reserved node name, beginning with an underscore. The underscore construct is used to define a semantic scope for DNS records that are associated with the parent domain. This specification explores the nature of this DNS usage and defines the "underscore names" registry with IANA.},
}