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TLG Review – Independent External Reviewers' Draft Report

Open: 23 October 2010
Closed: 21 November 2010

Explanation/Background: On 23 October 2010, JAS Communications LLC, the independent consultants selected to carry out the external review of the Technical Liaison Group (TLG), released their draft report [PDF, 286 KB], presenting their preliminary conclusions and recommendations.

[PDF, 548 KB] العربية Español [PDF, 880 KB] Français [PDF, 859 KB] Русский [PDF, 952 KB] 中文 [PDF, 1.01 MB]

The draft report is now submitted for a public comment period that will close on 21 November 2010.

All comments received in response to the independent external reviewers' draft report [PDF, 286 KB] shall be taken into account by the external reviewers when drafting their final report, which will subsequently be considered by the ICANN Board's Structural Improvements Committee and the ICANN Board for potential actions to take.

For more information about the TLG review, please refer to the TLG review webpage.

Staff member responsible: Olof Nordling

Announcement | Comments | Summary/analysis of comments

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."