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This document specifies a set of Label Generation Rules (LGR) for the Gujarati 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-Gujr]. The format of this file follows [RFC 7940]. This LGR is adapted from the “Reference LGR for the Second Level for the Gujarati Script” [Ref-LGR-und-Gujr], for details, see Change History below.
For details and additional background on the Gujarati script, see “Proposal for a Gujarati Script Label Generation Ruleset for the Root Zone" [Proposal-Gujarati].
This LGR contains 65 code points for letters covering multiple languages written using the Gujarati script and ranging from 1 to 4 on the [EGIDS] scale. The repertoire is a subset of [Unicode 11.0.0]. For details, see Section 5, “Repertoire” in [Proposal-Gujarati]. (The proposal cited has been adopted for the Gujarati script portion of the Root Zone LGR.)
For the second level, the repertoire has been augmented with the Gujarati digits, U+0AR6 to U+0AEF, ASCII digits U+0030 to U+0039, and U+002D HYPHEN-MINUS, for a total of 86 repertoire elements.
Any code points outside the Gujarati 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.
The variants defined in this LGR are limited to those required for use in zones not shared with any other script. However, because it does not share cross-script variants with other script LGRs, this LGR can be mixed easily with other LGRs in the same zone.
This LGR defines no variants for letters. For details, see Section 6, “Variants” in [Proposal-Gujarati].
Digit Variants: All Gujarati 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.
In particular, Gujarati 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.
Some Gujarati letters share forms with digits: U+0AB0 GUJARATI LETTER RA is a homoglyph variant of U+0aE8 GUJARATI DIGIT TWO. U+0AAA GUJARATI LETTER PA is a homoglyph variant of U+0AEB GUJARATI DIGIT FIVE. By transitivity, the ASCII digits TWO and FIVE are also variants of the respective letters, and so are all other corresponding native digits TWO and FIVE, even though not explicitly 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].
Gujarati is an alphasyllabary and the heart of the writing system is the akshar. This is the unit which is instinctively recognized by users of the script. As encoded, the writing system of Gujarati is composed of Consonants, the Implicit Vowel Killer: Halant, Vowels, Anusvara, Candrabindu, Nukta, Visarga and Avagraha.
Consonants: Gujarati consonants contain an implicit vowel schwa /ə/. The traditional classification categorizes them according to their phonetic properties. There are 5 Varga groups (classes) and one non-Varga group. Each varga, which corresponds to a particular stop, contains five consonants classified as per their properties. The first four consonants are classified on the basis of Voicing and Aspiration and the last is the corresponding nasal. More details in Section 3.4.1, “The Consonants” of the [Proposal-Gujarati].
Halant: All consonants contain the implicit vowel (schwa). A special sign is needed to denote that this implicit vowel is stripped off. This is known as the Halant (્). The Halant thus joins two consonants and creates conjuncts, which generally combine 2 to 4 consonants. In rare cases the Halant can join up to 5 consonants. More details in Section 3.4.2, “The Implicit Vowel Killer: Halant” in [Proposal-Gujarati].
Vowels and Matras: Separate symbols exist for all Vowels, which are either pronounced independently at the beginning or attached to a consonant. To indicate the latter (other than the implicit one), a Vowel modifier (matra) is attached to the consonant. Since the consonant has a built-in schwa, there are equivalent Matras for all vowels excepting the અ (U+0A85). More details in Section 3.4.3, “Vowels” in [Proposal-Gujarati].
Anusvara: In Gujarati, the Anusvara has a dual function. On the one hand, it acts as homorganic nasal, that is, it replaces a conjunct group of a Nasal Consonant+Halant+Consonant belonging to that particular varga. On the other hand, before a non-varga consonant the anusvara represents a nasal sound. Gujarati and its dialects prefer the anusvara to the corresponding half-nasal. More details in Section 3.4.4, “The Anusvara” in [Proposal-Gujarati].
Nukta: Traditionally Gujarati does not admit the Nukta. Gujarati grammarians in their inventory of the Gujarati alphabet do not admit this diacritic. However, the Nukta is used to represent content where Perso-Arabic characters have to be transliterated. It follows specific consonants listed in set C1. More details in Section 3.4.6, “Nukta” in [Proposal-Gujarati].
Visarga and Avagraha: The Visarga is frequently used in Sanskrit and represents a sound very close to /h/, as in દુઃખ /du:kh/ sorrow, unhappiness. It is used sparingly in Gujarati with a few words borrowed from Sanskrit. The Avagraha is rarely used and excluded from the LGR. More details in Section 3.4.7, “Visarga and Avagraha” in [Proposal-Gujarati].
Common Digits: U+0030 to U+0039 are the set of digits from the ASCII range.
Gujarati Digits: U+0AE6 to U+0AEF are a set of Gujarati-specific digits.
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 drafted to ensure that the prospective Gujarati label conforms to akshar formation norms as desired in Gujarati script. These norms are exclusively presented as context rules.
The following symbols are used in the WLE rules:
C → Consonant
M → Matra
V → Vowel
B → Anusvara
X → Visarga
H → Halant/Virama
N → Nukta
C1 → Consonants used with Nukta
The rules are:
More details in Section 7,"Whole Label Evaluation Rules (WLE)" in [Proposal-Gujarati].
The LGR in this document has been adapted from the corresponding Reference LGR for the Second Level. The Second Level Reference LGR for the Gujarati Script was developed by Michel Suignard and Asmus Freytag, based on the Root Zone LGR for the Gujarati script and information contained or referenced therein; see [RZ-LGR-Gujr]. 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 Gujarati 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-Gujarati], as well as [RZ-LGR-Overview].
Unicode Version has been updated.
Adopted from the Second Level Reference LGR for the Gujarati Script [Ref-LGR-und-Gujr] without normative changes.
The following general references are cited in this document:
For references consulted particularly in designing the repertoire for the Gujarati 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. Reference [101] corresponds to a source 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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