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IANA 域名职能合同修订案,附件 A


评议开放日期: 2019 年 1 月 7 日 截止日期: 2019 年 2 月 18 日
发起组织: 全球域名分部
类别/标签: IANA 域名职能合同,ICANN/PTI 合同
简介: 本轮公共评议期旨在针对 ICANN 和公共技术标识符 (PTI) 签署的《IANA 域名职能合同拟定修订案》征询社群的意见。这份修订案一旦通过将允许客户常任委员会 (CSC) 和 PTI/ICANN 对《IANA 域名职能服务水平协议 (SLA)》进行直接修改,而不是在每次需要调整 SLA 时都要对合同进行修订。这意味着针对 SLA 的调整将遵循一套 SLA 调整流程,从而在与 IANA 域名职能客户和广大 ICANN 社群展开适当协商后,及时地对 SLA 进行调整。

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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."