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二级域标签生成规则 (LGR) 参考列表

评议开放日期: 2016 年 6 月 7 日 截止日期: 2016 年 7 月 18 日
发起组织: 全球域名分部
类别/标签: 二级域
简介: 为了促进并改善新 gTLD 的测试一致性和注册管理运营稳定性,ICANN 制定了一套机读式国际化域名 (IDN) 参考列表,即二级域标签生成规则 (LGR),旨在用于预授权测试 (PDT) 和注册管理机构服务评估流程 (RSEP)。目前涉及 29 种语言的参考 LGR 现已发布以征询公众意见。另外,我们还提出了一套流程,即二级标签生成规则参考列表偏离度评估 [PDF, 255 KB],也同时发布以获取社群反馈。
链接: https://www.icann.org/public-comments/lgr-second-level-2016-06-07-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."