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二级域标签生成规则 (LGR) 参考列表


评议开放日期: 2020 年 8 月 24 日 截止日期: 2020 年 10 月 15 日
发起组织: 全球域名和战略部门 (GDS)
类别/标签: 二级域

ICANN 为了加强国际化域名 (Internationalized Domain Name, IDN) 列表审核流程的透明度和连贯性,促进新通用顶级域 (gTLD) 的注册运营,现已另行编制了一份机读格式的 IDN 参考列表,即“二级域标签生成规则 (LGR) 参考列表”。IDN 参考列表是基于《标签生成规则 (LGR) 参考列表编制指南》编写而成。这份编制之南则在社群审核完成后定稿。按照注册管理机构服务评估政策 (Registry Service Evaluation Policy, RSEP) 流程,LGR 参考列表旨在用于审核 gTLD 注册管理机构提交的 IDN 列表。


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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."