Root Zone Label Generation Rules for the Ethiopic Script

Overview

This file contains a set of Label Generation Rules for the Ethiopic script for the Root Zone. For more details on this LGR and its development, see "Proposal for Ethiopic Script Root Zone LGR [Proposal]". The format of this file follows [RFC 7940].

Repertoire

The repertoire of 311 code points is described in Section 5 "Repertoire", in [Proposal] and only includes code points used by languages that are actively written in the Ethiopic script. The repertoire is based on [MSR-4], which is a subset of [Unicode 6.3].

Each code point or range is tagged with the script or scripts that the code point is used with, and one or more references documenting sufficient justification for inclusion in the repertoire, see "References" below. Comments identify the languages using the code point.

Variants

According to Section 6, "Variants" in [Proposal], there are significant numbers of code points that can be used interchangeably in the writing system of the Amharic language. Two code points are variants of each other if they can be used interchangeably in the writing system of the Amharic language and their use yields identical lexical terms for canonical labels (for labels with dictionary meaning) and same or identical representation(s) for non-canonical labels (for labels which do not have dictionary meaning). The Amharic language is the official working language of the Federal Democratic Republic of Ethiopia and many of the states within the federal system. Due to security problems these variants pose, they are treated as script wide variants beyond the Amharic language.

Variant Disposition: All variants are of type "blocked", making labels that differ only by these variants mutually exclusive: whichever label containing either of these variants is chosen earlier would be delegated, while any other equivalent label should be blocked.

This LGR does not define allocatable variants.

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

Character Classes

This LGR does not define character classes.

Whole Label Evaluation (WLE) and Context Rules

Default Whole Label Evaluation Rules and Actions

The 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 ⍟.

Ethiopic-specific Rules

According to Section 7 "Whole Label Evaluation (WLE) Rules" in [Proposal], this LGR does not define rules specific to Ethiopic.

Methodology and Contributors

The Ethiopic LGR was develeoped by the Ethiopic Generation Panel. For details on methodology and contributors, see Sections 4 and 8 of [Proposal].

References

The following general references are cited in this document:

[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

[Proposal]

Ethiopic Generation Panel, "Proposal for Ethiopic Script Root Zone LGR", 17 May, 2017,
https://www.icann.org/en/system/files/files/proposal-ethiopic-lgr-17may17-en.pdf

[RFC 7940]

Davies, K. and A. Freytag, "Representing Label Generation Rulesets Using XML", RFC 7940, August 2016,
http://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

[Unicode 6.3]

The Unicode Consortium. The Unicode Standard, Version 6.3.0, (Mountain View, CA: The Unicode Consortium, 2013. ISBN 978--936213-08-5)
http://www.unicode.org/versions/Unicode6.3.0/

For references consulted particularly in designing the repertoire for the Ethiopic script for the Root Zone please see details in the Table of References below. Reference [4] and [7] refer to the Unicode Standard versions in which corresponding code points were initially encoded. Reference [101] to [104] correspond to sources given in [Proposal] for justifying the inclusion of for the corresponding code points. Single code points or ranges may have multiple source reference values.

4.1 Character Classes

The following table lists all named and implicit classes with their definition and a list of their members intersected with the current repertoire (for larger classes, this list is elided).

4.2 Whole label evaluation and context rules

The following table lists all named rules defined in the LGR and indicates whether they are used as trigger in an action or as context (when or not-when) for a code point or variant.

4.3 Actions

The following table lists the actions that are used to assign dispositions to labels and variant labels based on the specified conditions. The order of actions defines their precedence: the first action triggered by a label is the one defining its disposition.