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根区标签生成规则第 4 版 (RZ-LGR-4)


评议开放日期: 2020 年 6 月 29 日 截止日期: 2020 年 8 月 11 日
发起组织: 全球域名分部
类别/标签: 顶级域

整合专家组 (IP) 已成功评估孟加拉文和中文的根区标签生成规则 (LGR) 提案,以及马来亚拉姆文的最新提案。相关文字的生成专家组 (GP) 在公开发布这些提案征询公众意见后,对提案进行了定稿并提交。IP 则负责将这些提案,以及在根区 LGR 第三版 (RZ-LGR-3) 中已经纳入的其他文字提案联合整合进根区 LGR 第四版 (RZ-LGR-4)。根据涉及国际化域名应用标签的根区标签生成规则制定和维护规程RZ-LGR-4 现已公开发布征询公众意见,以便搜集社群的反馈来最终定稿。RZ-LGR 将用于确定有效的顶级国际化域名 (IDN) 标签及其变体标签。


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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."