abjad
Enable an agent to recognise an abjad, assess how a particular writing tradition represents consonants and vowels, and choose appropriate reading, annotation and transformation actions.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
recalled by Codex without web access - no source was read
Researched by: Codex
Purpose and description
Enable an agent to recognise an abjad, assess how a particular writing tradition represents consonants and vowels, and choose appropriate reading, annotation and transformation actions.
An abjad is a writing system whose basic letters primarily represent consonants, while vowels are generally left unrepresented or indicated selectively through supplementary letters or marks.
It can be Assess whether a specified orthographic tradition fits an explicit definition of abjad.; Identify consonantal signs, vowel indications and other marks without conflating their functions.; Generate possible vocalised readings while retaining ambiguity and the evidence for each candidate.; Transliterate under a named convention and identify distinctions that the conversion loses.; Check text against the vowel-marking conventions of its language, period and intended audience.; Configure search and comparison rules that distinguish exact spelling from deliberately normalised matching..
Distinguishing features
The ordinary spelling system principally represents consonants and permits vowels to remain systematically unwritten; occasional vowel omission alone does not establish an abjad.
A consonant sign does not ordinarily require the default inherent-vowel interpretation characteristic of an abugida.
Vowel points or vowel-bearing letters may supplement consonantal writing without automatically making the underlying orthography an alphabet.
Classification depends on a script's use in a particular orthography, not solely on its name, visual appearance or direction of writing.
The intended sense is a writing-system category, distinguishable from the use of 'abjad' for a letter ordering or a numeral system.
Scope
+ Classification of a writing system as an abjad within a specified language, period and orthographic tradition
+ Consonant-bearing graphemes and their correspondence to linguistic units
+ Omitted vowels, vowel points and consonant letters used to indicate vowels
+ Orthographic conventions that govern optional and required vowel indication
+ Reading ambiguity and context needed to interpret underspecified forms
+ Constraints on transcription, transliteration, vocalisation and digital processing
- Individual texts, editions, files and physical inscriptions as authored or material objects
- Complete grammar and phonology of languages written using an abjad
- Abugidas, syllabaries and alphabets except for classification boundaries
- Typeface design, calligraphy and handwriting technique beyond their effect on grapheme recognition
- Abjad numeral values and numerical interpretation as separate uses of letters
- Copyright, publication rights and bibliographic identity of particular works
Characteristics
- Classification context
- Script tradition, language, historical period and orthographic convention Prevents classification of every adaptation of the same script as an abjad.
- Primary grapheme function
- Consonantal, vocalic, mixed, auxiliary or unresolved, assessed per grapheme Makes the consonant-centred organisation testable without assuming one letter has one fixed function.
- Vowel representation mechanisms
- Omission, vowel points, vowel letters, matres lectionis or combinations Identifies how readers recover vowels and which distinctions the writing explicitly preserves.
- Vocalisation convention
- Normally unmarked, selectively marked, routinely marked or context-dependent Separates the orthography's normal practice from the marking present in one text.
- Vowel indication coverage
- Percentage of eligible vowel positions explicitly indicated in a defined sample, with counting rules Supports comparison of actual marking practices without treating a numerical threshold as the definition of an abjad.
- Consonantal ambiguity
- Distinct consonants distinguished by base forms, auxiliary marks, context or combinations Prevents consonant-distinguishing marks from being mistaken for optional vowel notation.
- Orthographic status
- Current, historical, restricted-use, proposed or unresolved within a named community Determines which conventions are appropriate for reading or producing a particular form.
- Transformation recoverability
- Reversible, reversible with metadata, lossy or unresolved for a specified transformation Shows whether an agent can reconstruct distinctions after stripping marks, transliterating or normalising text.
Also called
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 18 findings · 28 questions.
Abjad identity and boundaries Establishes the intended sense and the orthographic unit being classified.
An agent must distinguish an abjad from neighbouring writing-system types and from other meanings of the same word.
Writing-system sense
Anchors the entry to consonant-centred writing rather than letter ordering or numerical usage.
Classification criterion
Record the adopted definition and the evidence that consonants are primary while vowels can remain systematically unrepresented.
- Which definition of abjad governs classification, and what ordinary spelling practices satisfy it? definition
- Does the reference concern a writing-system type, an alphabetical ordering or letter-based numerals? boundary
Orthographic unit
Locates classification in a specific use of a script.
Script-use boundary
Record the language, period and convention being assessed, including adaptations that change how vowels are represented.
- Which language, period and orthographic tradition does the abjad classification apply to? boundary
- Does this use systematically omit vowels, require independent vowel letters or assign inherent vowels to consonant signs? definition
Consonantal representation Describes what the consonantal framework encodes and how its signs are distinguished.
Recognising an abjad requires evidence about grapheme functions rather than visual resemblance or an assumed letter inventory.
Consonant graphemes
Relates written units to consonantal distinctions within the selected orthography.
Grapheme-sound correspondence
Record consonant-bearing graphemes, multiletter units and context-dependent correspondences without assuming a one-to-one mapping.
- Which graphemes or grapheme sequences represent consonants in this orthography? definition
- Where do historical spelling, silent letters or merged sounds prevent a direct letter-to-consonant mapping? boundary
Sign distinction
Separates consonant identity from positional shapes and auxiliary notation.
Identity-bearing marks
Record which marks distinguish consonants and which shape differences are contextual forms of the same grapheme.
- Which dots or other marks distinguish consonant identities, and which instead indicate vowels or pronunciation? definition
- Which distinctions would disappear if an agent removed marks or collapsed visually related forms? action
Vowel indication Captures the mechanisms and conventions through which vowels are omitted or made explicit.
Vowel underspecification is central to an abjad, but its extent and mechanisms vary by orthography and use.
Vowel mechanisms
Identifies vowel letters, points and dual-use consonant letters.
Explicit and implicit vowels
Record how vowel quality, length or absence is indicated and when letters function as matres lectionis rather than consonants.
- Which vowel distinctions can be explicitly represented, and by which letters or marks? definition
- What contextual rules distinguish a consonantal use of a letter from its use as a vowel indicator? boundary
Vocalisation practice
Relates the amount of vowel notation to genre, audience and orthographic requirements.
Marking requirements
Record when vowel notation is required, optional or selectively added, distinguishing ordinary practice from a particular sample.
- Under which educational, liturgical, lexical or general-reading conventions are vowel indications required or optional? boundary
- What proportion of eligible vowel positions is indicated in the sample, and how are eligible positions defined? measurement
Reading and interpretation Models the evidence needed to interpret a consonantal spelling without hiding unresolved readings.
An abjad can leave distinctions unwritten, so agents must separate what a text states graphically from what they infer.
Reading candidates
Tracks plausible interpretations and the context that supports them.
Underspecified readings
Record competing readings of an unvocalised form and the lexical, grammatical or discourse evidence used to distinguish them.
- Which readings remain compatible with the written consonants and any supplied vowel indications? definition
- What linguistic context or attested reading supports choosing among those candidates? provenance
Editorial vocalisation
Controls additions that make an inferred reading explicit.
Added vowels as interpretation
Keep supplied vowel notation distinguishable from original notation and preserve unresolved alternatives.
- Which vowel indications belong to the source, and which were supplied by an editor or agent? provenance
- What evidence permits an agent to add vocalisation, and when must it return multiple candidates? action
Digital handling and conversion Defines appropriate handling of abjad distinctions during encoding, comparison and conversion.
Operations on marks and letter forms can alter consonant identity, erase vocalisation or introduce unsupported vowels.
Representation and matching
Connects encoded sequences and rendered forms to orthographic identity.
Normalisation boundaries
Specify which equivalences are appropriate for exact preservation, search and linguistic comparison.
- Which encoded sequences or contextual forms represent the same grapheme under the relevant convention? definition
- For the requested search or comparison, may vowel marks be ignored while consonant-distinguishing marks remain significant? action
Transliteration and transcription
Separates conversion of written signs from representation of an interpreted pronunciation.
Conversion evidence and loss
Record the conversion convention, treatment of unwritten vowels and information needed for reversal.
- Does the requested output transliterate written graphemes or transcribe a supported pronunciation? boundary
- Which distinctions are lost or inferred, and what metadata would make the conversion reversible? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- The intended sense is inferred to be the writing-system category; no sense was recorded.
- Pure and impure are established typological labels, but classification can depend on the particular language, orthography and historical period.
- This is recalled knowledge, not source-verified research.
- Which of these check these first hold for the sense of abjad this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Pure abjads, which do not systematically indicate vowels
- Impure abjads, which optionally or partially indicate vowels
- Which of these kinds and varieties hold for the sense of abjad this model covers, and on what evidence? provenance
Identifiers and schemes
Recalled without web access and unsourced; every item is a lead to verify.
- ISO 15924 - Four-letter script codes, such as Arab for Arabic and Hebr for Hebrew - Identifies particular scripts, not the typological category abjad.
- Which of these identifiers and schemes hold for the sense of abjad this model covers, and on what evidence? provenance
Standards and regulation
Recalled without web access and unsourced; every item is a lead to verify.
- Unicode Standard - Unicode Consortium: encodes characters used by abjad scripts and specifies relevant text-processing behavior.
- ISO 15924 - International Organization for Standardization: provides codes for names of scripts.
- Which of these standards and regulation hold for the sense of abjad this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Everyday Arabic writing generally omits short-vowel marks.
- Everyday Hebrew writing generally omits vowel points.
- Vowel marks support pronunciation in educational materials, dictionaries and religious texts.
- Historical inscriptions and manuscripts use abjads such as Phoenician and Aramaic.
- Which of these real-world use hold for the sense of abjad this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Unmarked vowels can leave words ambiguous without linguistic or contextual knowledge.
- Incorrect placement or omission of vowel marks can change the intended reading.
- Software that mishandles combining marks or bidirectional text can render or order text incorrectly.
- Which of these failure modes and hazards hold for the sense of abjad this model covers, and on what evidence? provenance
Regional variation
Recalled without web access and unsourced; every item is a lead to verify.
- Arabic-derived writing traditions differ in their added letters and conventions for representing vowels across languages.
- Hebrew writing varies in its use of vowel points and vowel-indicating letters by period, community and genre.
- Use of an Arabic-derived script does not by itself establish that an orthography is an abjad; some adaptations represent vowels systematically.
- Which of these regional variation hold for the sense of abjad this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- Alphabet - An alphabet regularly represents both consonants and vowels with letters; an abjad primarily represents consonants.
- Abugida - An abugida normally gives a consonant sign an inherent vowel that modifications can change; an abjad does not generally assign consonant letters an inherent vowel.
- Syllabary - A syllabary uses basic signs for syllables rather than primarily for individual consonants.
- Arabic script - Arabic script is a particular script; abjad is a category that includes multiple writing systems.
- Abjad numerals - Abjad numerals assign numerical values to Arabic letters; this is a numerical convention rather than a writing-system category.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of abjad this model covers, and on what evidence? provenance
What the second pass must settle
- Which authoritative definition should govern borderline abjad classifications, including traditions with extensive vowel-letter use?
- Which registry entries or existing world models already cover writing systems, scripts and orthographies, and where should this model link to avoid duplication?
- Which representative language-period-orthography cases should be researched to establish the range of vowel-marking practices?
- What counting method can compare vowel indication coverage across traditions without obscuring their different spelling conventions?
- Which documented encoding and transliteration conventions should govern actionable transformations for each instantiated abjad tradition?