3 2019-07-10 und-Arab und-Deva und-Ethi und-Geor und-Gujr und-Guru und-Hebr und-Khmr und-Knda und-Laoo und-Mlym und-Orya und-Sinh und-Taml und-Telu und-Thai . 6.3.0 Label Generation Rules for the Root Zone — LGR-3
Note: this merged file is intended to be used for testing a label for conflicts with existing labels irrespective of their script. However, it can neither be used to conclusively establish the validity of any label nor to generate the set of allocatable variant labels (see Section 5.2, "Common LGR" in [RZ-LGR-3-Overview]).

Overview

This document, together with the set of element LGRs, specifies an integrated collection of Label Generation Rules for the Root Zone. For more details on the Root Zone LGRs and their development see "Root Zone Label Generation Rules - LGR-3: Overview and Summary" [RZ-LGR-3-Overview]. This file is one of a set of LGR files that together form an integrated LGR for the DNS Root Zone [RZ-LGR-3]. The format of this file follows [RFC 7940].

Element LGRs

The Label Generation Rules for the Root Zone (LGR-3) are integrated from the following set of script-specific element LGRs:

Each element LGR provides the complete spefication for determining both the validity of a label in the given script, as well as the set of allocatable (or blocked) variant labels. See Section 5.2, "Steps in Processing a Label" in [RZ-LGR-3-Overview].

Each LGR represents in full the underlying, proposal for the script-based LGR, except for changes required by the integration process or for uniformity of presentation. See Section 3, "Integration and Contents of LGR-3" in [RZ-LGR-3-Overview].

Merged LGR

This merged LGR contains the union of the repertoire, variant mappings and Whole Label Evaluation (WLE) rules as described in the following sections. Data that are necessarily script-dependent, such as the type for variant mappings have been removed or replaced by default values.

When processing an applied for label, this merged LGR presents the complete data and specification needed for conflict checking with any existing label, independent of script, while each script-specific element LGR presents the complete data and specification to determine the validity and full set of allocatable variants for the label, when applied for under that script. See also Section 5, "Using the LGR" in [RZ-LGR-3-Overview].

Repertoire

The repertoire of the integrated Root Zone LGR is the cumulative repertoire of all the Element LGRs that have been integrated into this version. Those repertoires, in turn were developed based on [MSR-4], which is a subset of [Unicode 6.3].

As a Root Zone LGR, the repertoire includes neither digits nor the HYPHEN-MINUS.

For further details, see Section 3.2.1, "Repertoire" in [RZ-LGR-3-Overview].

Each code point or range is tagged with the script or scripts that the code point is used with, and a reference to the Unicode Standard in which the code point was first encoded, see "References" below. Some code points are also tagged with script-specific classifications. These tags have been prefixed with the Unicode script identifier.

Variants

The variant mappings in this LGR are the union of the non-reflexive variant mappings from all the Element LGRs that have been integrated into this version of the Root Zone LGR. Because the disposition of variant labels, for example as "allocatable", is specific to each script, information related to that cannot be expressed in the script-neutral context of this merged file. Instead, all merged variant mappings are labeled as "blocked" in this document as needed for conflict checking. See also Section 3.2.2, "Variants" in [RZ-LGR-3-Overview].

Context Rules for Variants: some of the variants defined in this LGR are "effective null variants", that is, some code points in the source map to "nothing" in the target with all other code points unchanged. (Because mappings are symmetric, it does not matter whether it is the forward or reverse mapping that maps to "null"). Such variants require a context rule to keep the variant set well behaved. Symmetry requires the same context rule for both forward and reverse mappings.

In other cases, the sequences or code points making up source and target are constrained by explicit context rules on the code points (or by implicit context rules defined for the adjacent code points). In such a case, any variants may require context rules that match the intersection between the effective contexts for both source and target; otherwise, a sequence might be considered valid in some variant label when it would not be valid in an equivalent context in an original label.

The specification of variants in the Root Zone LGR follows the guidelines in [RFC 8228].

Character Classes

This merged LGR includes the cumulative set of character classes from all the Element LGRs that have been integrated into this version of the Root Zone LGR. See Section 3.2.3, "Character Classes" in [RZ-LGR-3-Overview]. The names for any script-specific character classes have been prefixed with the Unicode script identifier.

Whole Label Evaluation (WLE) and Context Rules

This merged LGR includes the cumulative set of WLE and context rules and actions from all the Element LGRs that have been integrated into this version of the Root Zone LGR. See Section 3.2.4, "Whole Label Evaluation Rules (WLE)" [RZ-LGR-3-Overview]. See also the comments given for each rule or action.

Default Whole Label Evaluation Rules and Actions

The integrated LGR includes the set of required default WLE rules and actions applicable to the Root Zone and defined in [MSR-4]. They are marked with ⍟. These default rules include the restrictions defined in [RFC 5891] on placement of combining marks.

Script-specific WLE rules

The names for any script-specific rules have been prefixed with the Unicode script identifier.

Methodology and Contributors

The Root Zone Label Generation Rules - LGR-3 were integrated by the Integration Panel [IP] from a set of proposals for script-based root zone LGRs developed by community-based Generation Panels [GPs] in an open process with multiple public consultations defined in [Procedure] and [Guidelines]. For more information on the methodology and contributors, see [RZ-LGR-3-Overview], in particular Section 2 "Process of Integration" and Section 8, "Contributors".

References

In the listing of the repertoire, references starting at [0] refer to Unicode Standard versions in which the corresponding code points were initially encoded. References [100] and above correspond to the script-specific LGRs that include the repertoire item. Repertoire items may have more than one reference.

In addition the following references are cited in this document:

[GPs]
Internet Corporation for Assigned Names and Numbers (ICANN), "Generation Panels", https://community.icann.org/display/croscomlgrprocedure/Generation+Panels (Accessed on 20 Nov. 2015)
[Guidelines]
Internet Corporation for Assigned Names and Numbers, (ICANN),“Guidelines for Developing Script-Specific Label Generation Rules for Integration into the Root Zone LGR”. (Los Angeles, California: ICANN, December 2014), https://community.icann.org/download/attachments/43989034/Guidelines-for-LGR-2014-12-02.pdf
[IP]
Internet Corporation for Assigned Names and Numbers, (ICANN), "Integration Panel" https://community.icann.org/display/croscomlgrprocedure/Integration+Panel, (Accessed on 20 Nov. 2015)
[MSR-4]
Integration Panel, "Maximal Starting Repertoire - MSR-4: Overview and Rationale", 7 February 2019, https://www.icann.org/en/system/files/files/msr-4-overview-25jan19-en.pdf
[Procedure]
Internet Corporation for Assigned Names and Numbers, "Procedure to Develop and Maintain the Label Generation Rules for the Root Zone in Respect of IDNA Labels." (Los Angeles, California: ICANN, March, 2013) http://www.icann.org/en/resources/idn/variant-tlds/draft-lgr-procedure-20mar13-en.pdf
[Proposal-Arabic]
TF-AIDN, "Proposal for Arabic Script Root Zone LGR", 18 November 2015 (PDF), https://www.icann.org/en/system/files/files/arabic-lgr-proposal-18nov15-en.pdf
[Proposal-Devanagari]
Neo-Brahmi Generation Panel, "Proposal for the Devanagari Script Root Zone LGR", 22 April 2019 (PDF), https://www.icann.org/en/system/files/files/proposal-devanagari-lgr-22apr19-en.pdf
[Proposal-Ethiopic]
Ethiopic Script Generation Panel, "Proposal for Ethiopic Script Root Zone LGR", 17 May 2017 (PDF), https://www.icann.org/en/system/files/files/proposal-ethiopic-lgr-17may17-en.pdf
[Proposal-Georgian]
Georgian Script Generation Panel, "Proposal for the Georgian Script Root Zone LGR", 24 November 2016 (PDF), https://www.icann.org/en/system/files/files/proposal-georgian-lgr-24nov16-en.pdf
[Proposal-Gujarati]
Neo-Brahmi Generation Panel, "Proposal for the Gujarati Script Root Zone LGR", 6 March 2019 (PDF), https://www.icann.org/en/system/files/files/proposal-gujarati-lgr-06mar19-en.pdf
[Proposal-Gurmukhi]
Neo-Brahmi Generation Panel, "Proposal for the Gurmukhi Script Root Zone LGR", 22 April 2019 (PDF), https://www.icann.org/en/system/files/files/proposal-gurmukhi-lgr-22apr19-en.pdf
[Proposal-Hebrew]
Hebrew Generation Panel, "Proposal for a Hebrew Script Root Zone Label Generation Ruleset (LGR)", 24 April 2091 (PDF), https://www.icann.org/en/system/files/files/proposal-hebrew-lgr-24Apr2019-en.pdf
[Proposal-Kannada]
Neo-Brahmi Generation Panel, "Proposal for the Kannada Script Root Zone LGR", 6 March 2019 (PDF), https://www.icann.org/en/system/files/files/proposal-kannada-lgr-06mar19-en.pdf
[Proposal-Khmer]
Khmer Generation Panel, “Proposal for Khmer Script Root Zone Label Generation Rules (LGR)”, 15 August 2016 (PDF), https://www.icann.org/en/system/files/files/proposal-khmer-lgr-15aug16-en.pdf
[Proposal-Lao]
Lao Script Generation Panel, "Proposal for a Lao Script Root Zone LGR", 31 January 2017 (PDF), https://www.icann.org/en/system/files/files/proposal-lao-lgr-31jan17-en.pdf
[Proposal-Malayalam]
Neo-Brahmi Generation Panel, "Proposal for the Malayalam Script Root Zone LGR", 22 April 2019 (PDF), https://www.icann.org/en/system/files/files/proposal-malayalam-lgr-22apr19-en.pdf
[Proposal-Oriya]
Neo-Brahmi Generation Panel, "Proposal for the Oriya Script Root Zone LGR", 6 March 2019 (PDF), https://www.icann.org/en/system/files/files/proposal-oriya-lgr-06mar19-en.pdf
[Proposal-Sinhala]
Neo-Brahmi Generation Panel, "Proposal for the Sinhala Script Root Zone LGR", 22 April 2019 (PDF), https://www.icann.org/en/system/files/files/proposal-sinhala-lgr-22apr19-en.pdf
[Proposal-Tamil]
Neo-Brahmi Generation Panel, "Proposal for the Tamil Script Root Zone LGR", 6 March 2019 (PDF), https://www.icann.org/en/system/files/files/proposal-tamil-lgr-06mar19-en.pdf
[Proposal-Telugu]
Neo-Brahmi Generation Panel, "Proposal for the Telugu Script Root Zone LGR", 7 June 2019 (PDF), https://www.icann.org/en/system/files/files/proposal-telugu-lgr-07jun19-en.pdf
[Proposal-Thai]
The Generation Panel for the Thai Script LGR, "Proposal for the Thai Script Root Zone LGR", 25 May 2017 (PDF), https://www.icann.org/en/system/files/files/proposal-thai-lgr-25may17-en.pdf
[RFC 5891]
J. Klensin, "Internationalized Domain Names in Applications (IDNA): Protocol", RFC 5891, August 2010, https://www.rfc-editor.org/info/rfc5891
[RFC 6365]
Hoffman, P. and J. Klensin, "Terminology Used in Internationalization in the IETF", BCP 166, RFC 6365, DOI 10.17487/RFC6365, September 2011, https://www.rfc-editor.org/info/rfc6365
[RFC 7940]
Davies, K. and A. Freytag, "Representing Label Generation Rulesets Using XML", RFC 7940, August 2016, https://www.rfc-editor.org/info/rfc7940
[RFC 8228]
A. Freytag, "Guidance on Designing Label Generation Rulesets (LGRs) Supporting Variant Labels", RFC 8228, August 2017, https://www.rfc-editor.org/info/rfc8228
[RZ-LGR-3-Overview]
Integration Panel, "Root Zone Label Generation Rules - LGR-3: Overview and Summary", 10 July 2019 (PDF), https://www.icann.org/sites/default/files/lgr/lgr-3-overview-10jul19-en.pdf
[RZ-LGR-3]
Integration Panel, "Label Generation Rules for the Root Zone — LGR-3", 10 July 2019 (XML), https://www.icann.org/sites/default/files/lgr/lgr-3-common-10jul19-en.xml
non-normative HTML presentation: https://www.icann.org/sites/default/files/lgr/lgr-3-common-10jul19-en.html
[Unicode 6.3]
The Unicode Consortium. The Unicode Standard, Version 6.3.0, (Mountain View, CA: The Unicode Consortium, 2013. ISBN 978-1-936213-08-5) http://www.unicode.org/versions/Unicode6.3.0/

For more details for references [100] and up and [0] and up refer to the Table of References below, as well as to [RZ-LGR-3-Overview].

]]> The Unicode Standard 1.1 The Unicode Standard 3.0 The Unicode Standard 4.0 The Unicode Standard 4.1 The Unicode Standard 5.0 The Unicode Standard 5.1 The Unicode Standard 6.0 The Unicode Standard 6.1 Integration Panel, "Maximal Starting Repertoire - MSR-4: Overview and Rationale", 25 January 2019 https://www.icann.org/en/system/files/files/msr-4-overview-25jan19-en.pdf Root Zone Label Generation Rules for the Arabic Script (und-Arab) , 10 July 2019 (XML) https://www.icann.org/sites/default/files/lgr/lgr-3-arabic-script-10jul19-en.xml Root Zone Label Generation Rules for the Devanagari Script (und-Deva) , 10 July 2019 (XML) https://www.icann.org/sites/default/files/lgr/lgr-3-devanagari-script-10jul19-en.xml Root Zone Label Generation Rules for the Ethiopic Script (und-Ethi) , 10 July 2019 (XML) https://www.icann.org/sites/default/files/lgr/lgr-3-ethiopic-script-10jul19-en.xml Root Zone Label Generation Rules for the Georgian Script (und-Geor) , 10 July 2019 (XML) https://www.icann.org/sites/default/files/lgr/lgr-3-georgian-script-10jul19-en.xml Root Zone Label Generation Rules for the Gurjarati Script (und-Gujr) , 10 July 2019 (XML) https://www.icann.org/sites/default/files/lgr/lgr-3-gujarati-script-10jul19-en.xml Root Zone Label Generation Rules for the Gurmukhi Script (und-Guru) , 10 July 2019 (XML) https://www.icann.org/sites/default/files/lgr/lgr-3-gurmukhi-script-10jul19-en.xml Root Zone Label Generation Rules for the Hebrew Script (und-Hebr) , 10 July 2019 (XML) https://www.icann.org/sites/default/files/lgr/lgr-3-hebrew-script-10jul19-en.xml Root Zone Label Generation Rules for the Kannada Script (und-Knda) , 10 July 2019 (XML) https://www.icann.org/sites/default/files/lgr/lgr-3-kannada-script-10jul19-en.xml Root Zone Label Generation Rules for the Khmer Script (und-Khmr) , 10 July 2019 (XML) https://www.icann.org/sites/default/files/lgr/lgr-3-khmer-script-10jul19-en.xml Root Zone Label Generation Ruleset for the Lao Script (und-Laoo) , 10 July 2019 (XML) https://www.icann.org/sites/default/files/lgr/lgr-3-lao-script-10jul19-en.xml Root Zone Label Generation Rules for the Malayalam Script (und-Mlym) , 10 July 2019 (XML) https://www.icann.org/sites/default/files/lgr/lgr-3-malayalam-script-10jul19-en.xml Root Zone Label Generation Rules for the Oriya Script (und-Orya) , 10 July 2019 (XML) https://www.icann.org/sites/default/files/lgr/lgr-3-oriya-script-10jul19-en.xml Root Zone Label Generation Rules for the Sinhala Script (und-Sinh) , 10 July 2019 (XML) https://www.icann.org/sites/default/files/lgr/lgr-3-sinhala-script-10jul19-en.xml Root Zone Label Generation Rules for the Tamil Script (und-Taml) , 10 July 2019 (XML) https://www.icann.org/sites/default/files/lgr/lgr-3-tamil-script-10jul19-en.xml Root Zone Label Generation Rules for the Telugu Script (und-Telu) , 10 July 2019 (XML) https://www.icann.org/sites/default/files/lgr/lgr-3-telugu-script-10jul19-en.xml Root Zone Label Generation Rules for the Thai Script (und-Thai) , 10 July 2019 (XML) https://www.icann.org/sites/default/files/lgr/lgr-3-thai-script-10jul19-en.xml 0A19 0A1E 0A23 0A39 0A5C 0A42 0A09