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根区标签生成规则 (RZ-LGR) 最大启动字汇第 3 版 (MSR-3)


评议开放日期: 2018 年 1 月 17 日 截止日期: 2018 年 2 月 26 日
发起组织: 全球域名分部
类别/标签: 顶级域
简介: ICANN 现针对最大启动字汇第 3 版 (MSR-3) 征询公众意见:HTMLXML。这一版与 MSR-2 版兼容,并在汉语字汇和拉丁文字汇中分别添加了 3 个码点。根据《根区中 IDN 标签生成规则的制定和维护规程 (Procedure to Develop and Maintain Label Generation Rules for the Root Zone with Respect to IDN Labels)》 [PDF, 772 KB],MSR 是社群生成专家组的工作起点。这类专家组负责为相关文字的根区标签生成规则 (RZ-LGR) 编制提案。有关 MSR-3 的内容和制定详细理由请参见《MSR-3——概览和理由》[PDF, 1.1 MB]一文。

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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"""" is not an IDN."