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This document specifies a set of Label Generation Rules (LGR) for the Kannada script for the second level domain or domains identified above. The starting point for the development of this LGR can be found in the related Root Zone LGR [RZ-LGR-Knda]. The format of this file follows [RFC 7940]. This LGR is adapted from the “Reference LGR for the Second Level for the Kannada Script” [Ref-LGR-und-Knda], for details, see Change History below.
For details and additional background on the Kannada script, see “Proposal for a Kannada Script Root Zone Label Generation Ruleset (LGR)" [Proposal-Kannada].
The repertoire contains 62 code points for letters covering Kannada, Tulu, Beary, Konkani, Havyaka, Kodava, among other languages written using the Kannada script. The repertoire is a subset of [Unicode 11.0.0]. For details, see Section 5, “Repertoire” in [Proposal-Kannada]. (The proposal cited has been adopted for the Kannada script portion of the Root Zone LGR.)
For the second level, the repertoire has been augmented with the HYPHEN-MINUS, and two sets of decimal digits:
for a total of 83 repertoire elements.
Any code points outside the Kannada Script repertoire that are targets for out-of-repertoire variants would be included here only if the variant is listed in this file. In this case they are identified as a reflexive (identity) variant of type “out-of-repertoire-var”. Whether or not they are listed, they do not form part of the repertoire.
Repertoire Listing: Each code point or range is tagged with the script or scripts with which the code point is used and one or more other character categories. For each repertoire element, one or more references document sufficient justification for inclusion in the repertoire; see the “References” below. Comments provide alternate names for some code points.
The variants defined in this LGR are limited to those required for use in zones not shared with any other script. As such, this LGR does not define cross-script variants. However, using this LGR concurrently with any LGR for Telugu in the same zone will create potential cross-script issues. For details, see Section 6, “Variants” in [Proposal-Kannada]. Mitigation of these cross-script variants can be addressed by using the Common LGR. For details, see Section 3, “Use of Multiple Reference LGRs in the Same Zone” in [Level-2-Overview]. In addition to variants defined by this LGR, the full variant information related to this script and required for concurrent use with the Telugu LGR(s) can be found in the following LGR: [Ref-LGR-Telugu-Full-Variant-Script]
There are no in-script variants defined for Kannada.
Digit Variants: All Kannada digits are treated as semantic variants of the corresponding common (ASCII) digits. By transitivity, they are also semantic variants of any native digits in scripts that also include the common digits. Such variant relations are deemed to exist implicitly by transitivity but are not listed explicitly in each reference LGR. Instead, if needed, they are applied by using the Common LGR in label processing.
There is a homoglyph relation between most Telugu and Kannada digits, but as the Telugu LGR does not support native digits, this does not give rise to variants.
In particular, Kannada digit ZERO is a cross-script homoglyph or near homoglyph of digit ZERO in many other scripts; these are already implicit semantic variants by transitivity and therefore not listed here.
To keep digit variant sets manageable in zones where multiple scripts are present, no attempt has been made at identifying cross-script variants among digits of different numeric value or between a digit in one script and a letter in another, such as between digit zero and Latin letter ‘o’. Other mechanisms may be required to prevent homograph labels.
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 labels should be blocked. There is no preference among these labels.
This LGR does not define allocatable variants.
The specification of variants in this LGR follows the guidelines in [RFC 8228].
The structure of the Kannada script is similar to that of other Indian scripts; it is particularly closely related to Telugu. The heart of the writing system is the akshar. The basic characters are classified into three main categories: swara (vowels), vyanjana (consonants) and yogavahas (semiconsonants).
Swaras (vowels): There are thirteen vowels. When a vowel follows a consonant, it is written with a diacritic rather than as a separate letter. Sometimes these are referred to as vowel signs or matras. More details in Section 3.4.1, “Swaras (vowels)” in [Proposal-Kannada].
Yogavahas (semiconsonants): The Yogavaha (part-vowel, part consonant) include two letters:
See Section 3.4.2, “Yogavahas” in [Proposal-Kannada].
Vyanjanas (consonants): Two categories of consonant characters are defined in Kannada: the structured consonants (vargeeya vyanjana) and the unstructured consonants (avargeeya vyanjana). For the purpose of this LGR, all consonants are treated the same. More details in Section 3.4.3, “Vyanjanas (consonants)” of the [Proposal-Kannada].
Halant / Virama: All consonant code points in Kannada contain an implicit vowel ಅ /a/. The Unicode character U+0CCD, which is the Kannada equivalent of the Devanagari Halant (or Virama), U+094D, is applied to consonants to remove the implicit vowel. More details in Section 3.4.4, “Implicit vowel ಅ (a) in consonants” in [Proposal-Kannada].
Kannada Digits: U+0CE6 to U+0CEF are a set of Kannada-specific digits. They are used in alternation with the European (common) digits.
Common Digits: U+0030 to U+0039 are the set of digits from the ASCII range.
The LGR includes the rules and actions to implement the following restrictions, some of which are mandated by the IDNA protocol. They are marked with ⍟ and included here by default.
This LGR includes the complete set default actions for LGRs as well as the action needed to invalidate labels with misplaced combining marks. They are marked with ⍟. For a description see [RFC 7940] and [150]. An additional action is triggered by mixed digit labels.
These rules have been formulated so that they can be adopted for LGR specification.
The following symbols are used in the WLE rules:
C → Consonant
M → Matra
V → Vowel
B → Anusvara
X → Visarga
H → Halant / Virama
The rules are:
More details in Section 7, “Whole Label Evaluation Rules (WLE)” of [Proposal-Kannada].
The LGR in this document has been adapted from the corresponding Reference LGR for the Second Level. The Second Level Reference LGR for the Kannada Script was developed by Michel Suignard and Asmus Freytag, based on the Root Zone LGR for the Kannada script and information contained or referenced therein; see [RZ-LGR-Knda]. Suitable extensions for the second level have been applied according to the [Guidelines] and with community input. The original proposal for a Root Zone LGR for the Kannada script, that this reference LGR is based on, was developed by the Neo-Brahmi Generation Panel (NBGP). For more information on methodology and contributors to the underlying Root Zone LGR, see Sections 4 and 8 in [Proposal-Kannada], as well as [RZ-LGR-Overview].
Unicode Version has been updated.
Adopted from the Second Level Reference LGR for the Kannada Script [Ref-LGR-und-Knda] without normative changes.
The following general references are cited in this document:
For references consulted particularly in designing the repertoire for the Kannada Script for the second level please see details in the Table of References below.
Reference [0] refers to the Unicode Standard version in which the corresponding code points were initially encoded. References [110] and above correspond to sources given in [Proposal-Kannada] justifying the inclusion of the corresponding code points. Entries in the table may have multiple source reference values. In the listing of whole label evaluation and context rules, reference [150] indicates the source for common rules.
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