Han Character Subset for Maximal Starting Repertoire - MSR-4

Overview

This file is a subset of Maximal Starting Repertoire, Version 4 (MSR-4), limited to code points with Script=Hani (Han ideographs). The overview document for MSR-4 contains links to various data files defining the normative content of MSR-4. It can be found at
https://www.icann.org/en/system/files/files/msr-4-overview-25jan19-en.pdf

Submitted by:

• Asmus Freytag, Mark Davis, and Michel Suignard

Background

In document L2/19-329 we proposed that the identifier type for Unified CJK ideographs in UTS#39 be reviewed and only a common, modern subset be given the type "Recommended", all others to be assigned "Uncommon_Use". This file represents the superset of Unified ideographs that will be available for top level domain names in the DNS Root Zone. It is also a superset of the ideographs currently allowed in registries such as .cn, .tw, .jp and .asia for second level domain names. We therefore think that the "Recommended" set should definitely include all the ideographs listed here.

Relation to iiCore

As can be seen below, the set presented here includes the latest iiCore repertoire. We are aware of efforts to expand iiCore (for example iiCore2020 as described in L2/18-279). The current set is not a superset of that draft. While there has been no request to add any of the iiCore2020-unique repertoire to the MSR or the Root Zone, we do not want this submission to be seen as suggesting that any ideographs additional to iiCore2020 should never become "Recommended". In particular as the definition for a general identifier from Unicode's perspective is not necessarily congruent with identifiers used as domain name.

Contents of this document

What follows is the text of the original description from MSR-4 followed by the normative specification of MSR-4, except that the repertoire has been reduced to the subset of Unified CJK ideographs from MSR-4 only. In particular, some of the references may be unused and any WLE rules or Actions are not relevant outside the context of the Root Zone LGR. The meta data have been adjusted to reflect the subsetting.

Repertoire and Default WLE Rules

This file specifies version 4 of the Maximal Starting Repertoire (MSR-4) as defined by the Integration Panel, for use in the development of the Root Zone LGR (RZ-LGR). For details on how to use this file as well as its status, or the methodology used in creating it, see the document named: "Maximal Starting Repertoire - MSR-4: Overview and Rationale" and documents cited therein. The format of this file follows RFC 7940.

Repertoire

The "ref" attribute for each code point or range indicates the Unicode version for which the corresponding code points were first encoded (for example, ref="4" means a character was first encoded in Unicode Version 3.1). References ZH and JP indicate ideographs that originated from the respective Chinese and Japanese IDN tables for the second level, while HK, IIC, and YY indicate Hong Kong (HKSCS), IICORE, and Yoyo-Kanji originated ideographs.

The "tag" attribute for each code point or range indicates the script or scripts that the code point is used with, using Unicode script identifiers, preceded by "sc:".

Default Whole Label Evaluation Rules

The default WLE rules, including both <rule> and <action> elements apply to any LGR proposed for integration into the RZ-LGR and must be copied into that LGR's XML file. Additional script-specific rules may be added to the proposal as required.