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Study on Technical Use of Root Zone Label Generation Rules

Open Date: 15 May 2019 Close Date: 30 June 2019
Originating Organization: ICANN: Global Domains Division
Categories/Tags: Top-Level Domains
Brief Overview:

Third version of the Root Zone Label Generation Rules (RZ-LGR-3) was released for public comment on 25 April 2019, integrating 16 script proposals out of the 28 scripts identified. As the RZ-LGR is being incrementally developed by the community, the RZ-LGR Study Group (SG) was constituted on the request of the ICANN Board to study technical considerations for utilizing the RZ-LGR to determine valid top-level domains (TLDs) and their variant labels in a harmonized manner. RZ-LGR-SG has completed its work and is releasing the Recommendations for the Technical Utilization of the Root Zone Label Generation Rules to seek feedback from the community. RZ-LGR-SG will take into account the community input to finalize the recommendations. The final recommendations will be presented to the ICANN Board for further consideration.

Link: https://www.icann.org/public-comments/technical-rz-lgr-2019-05-15-en

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Internationalized Domain Name ,IDN,"IDNs are domain names that include characters used in the local representation of languages that are not written with the twenty-six letters of the basic Latin alphabet ""a-z"". An IDN can contain Latin letters with diacritical marks, as required by many European languages, or may consist of characters from non-Latin scripts such as Arabic or Chinese. Many languages also use other types of digits than the European ""0-9"". The basic Latin alphabet together with the European-Arabic digits are, for the purpose of domain names, termed ""ASCII characters"" (ASCII = American Standard Code for Information Interchange). These are also included in the broader range of ""Unicode characters"" that provides the basis for IDNs. The ""hostname rule"" requires that all domain names of the type under consideration here are stored in the DNS using only the ASCII characters listed above, with the one further addition of the hyphen ""-"". The Unicode form of an IDN therefore requires special encoding before it is entered into the DNS. The following terminology is used when distinguishing between these forms: A domain name consists of a series of ""labels"" (separated by ""dots""). The ASCII form of an IDN label is termed an ""A-label"". All operations defined in the DNS protocol use A-labels exclusively. The Unicode form, which a user expects to be displayed, is termed a ""U-label"". The difference may be illustrated with the Hindi word for ""test"" — परीका — appearing here as a U-label would (in the Devanagari script). A special form of ""ASCII compatible encoding"" (abbreviated ACE) is applied to this to produce the corresponding A-label: xn--11b5bs1di. A domain name that only includes ASCII letters, digits, and hyphens is termed an ""LDH label"". Although the definitions of A-labels and LDH-labels overlap, a name consisting exclusively of LDH labels, such as""icann.org"" is not an IDN."