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ALAC 评审工作组最终报告草案


开始于: 2009 年 2 月 11 日
结束于: 2009 年 4 月 17 日

说明:ALAC 评审工作组 (WG) 已发布最终报告草案 [PDF,309K], 介绍对 ALAC 改进的一些结论。本次发布的报告供与 ICANN 社群讨论和咨询,其中包括在即将于 2009 年 3 月在墨西哥召开的 ICANN 会议上使用。 咨询和公众意见征询期结束后, 将发布最终报告并提交至结构改进委员会,供审批和交付决策。


有关 ALAC 评审的更多信息,请参见 ALAC 评审页面

负责工作人员: Marco Lorenzoni

公告 | 意见 | 意见摘要/分析

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."