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Label Generation Rules for the Root Zone Version 3 (RZ-LGR-3)

Open Date: 25 April 2019 Close Date: 4 June 2019
Originating Organization: Global Domains Division
Categories/Tags: Top-Level Domains
Brief Overview: The Integration Panel (IP) has successfully evaluated the Root Zone Label Generation Rules (LGR) proposals for 10 additional scripts, including Devanagari, Gujarati, Gurmukhi, Hebrew, Kannada, Malayalam, Oriya, Sinhala, Tamil and Telugu. These proposals were finalized and submitted by the respective Generation Panels (GPs), following the release of the individual proposals for public comments. The IP has integrated these proposals, along with Arabic, Ethiopic, Georgian, Khmer, Lao and Thai scripts already integrated into the second version of the Root Zone LGR (RZ-LGR-2), to develop the third version of the Root Zone LGR (RZ-LGR-3). As per the Procedure to Develop and Maintain the Label Generation Rules for the Root Zone in Respect of IDNA Labels, the RZ-LGR-3 is being released for public comments to gather community feedback for its finalization. RZ-LGR will be used to determine valid top-level Internationalized Domain Name (IDN) labels and their variant labels.

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Domain Name System
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"""" is not an IDN."