@misc{rfc6912,
    series =    {Request for Comments},
    number =    6912,
    howpublished =  {RFC 6912},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC6912},
    url =       {https://www.rfc-editor.org/info/rfc6912},
    author =    {Andrew Sullivan and Dave Thaler and Dr. John C. Klensin and Olaf Kolkman},
    title =     {{Principles for Unicode Code Point Inclusion in Labels in the DNS}},
    pagetotal = 12,
    year =      2013,
    month =     apr,
    abstract =  {Internationalized Domain Names in Applications (IDNA) makes available to DNS zone administrators a very wide range of Unicode code points. Most operators of zones should probably not permit registration of U-labels using the entire range. This is especially true of zones that accept registrations across organizational boundaries, such as top-level domains and, most importantly, the root. It is unfortunately not possible to generate algorithms to determine whether permitting a code point presents a low risk. This memo presents a set of principles that can be used to guide the decision of whether a Unicode code point may be wisely included in the repertoire of permissible code points in a U-label in a zone.},
}