ISO 24613-4:2021

Overview

ISO 24613-4:2021 - "Language resource management - Lexical markup framework (LMF) - Part 4: TEI serialization" defines how to serialize the LMF data model as an XML representation that is fully compliant with the Text Encoding Initiative (TEI) Guidelines. The document maps LMF classes from the LMF Core (ISO 24613-1), the MRD (machine-readable dictionary) extension (ISO 24613-2), and the etymological extension (ISO 24613-3) to a constrained, interoperable TEI P5 subset. The specification ensures LMF-to-TEI constructs (for example, using <teiCorpus type="lexicalResource"> and <teiHeader>) are valid XML and align with cardinalities and data category requirements in the ISO 24613 series.

Key technical topics and requirements

• TEI-based XML serialization: Prescribes TEI P5 constructs and a pure TEI subset so serialized lexica are valid TEI documents and well-formed XML (W3C XML 1.0).
• Coverage of LMF classes: Implements the LMF core model (lexicon, lexicalEntry, form, lemma, sense, grammaticalInformation, etc.), MRD classes (examples, translations, bibliographic references, form variants), and etymological classes (Etymology, Etymon, EtyLink, CognateSet).
• Univocal mapping and constraints: Provides mostly one-to-one TEI constructs per LMF class with explicit constraints (e.g., controlled @type value lists) to improve consistency and interoperability.
• Metadata handling: Relies on the TEI header (<teiHeader>) for resource metadata (creation, versioning, bibliographic information) rather than redefining LMF metadata constructs.
• Language and script tagging: Uses @xml:lang (BCP 47) and script coding consistent with IETF/ISO recommendations for language/script identification.
• Namespace & validity: Examples assume TEI namespace (xmlns="http://www.tei-c.org/ns/1.0"); serialized resources must conform to TEI guidelines and referenced ISO parts.

Practical applications and who uses it

ISO 24613-4:2021 is aimed at practitioners who need standardized, interoperable lexical data:

• Lexicographers and dictionary publishers - encode and publish machine-readable dictionaries (MRDs) and etymological content in a stable TEI format.
• Computational linguists & NLP engineers - integrate standardized lexica into NLP pipelines, morphological analyzers, or lexicon-driven NLP components.
• Digital humanities & corpus projects - enrich TEI-encoded corpora with lexicon links and etymological annotations.
• Language resource managers & archivists - preserve and exchange lexical resources with clear metadata and well-defined serialization.
• Software developers - implement import/export tools, validation, and converters between LMF and TEI serializations.

Benefits include improved interoperability, easier data exchange across systems, and consistent encoding of lexical, MRD and etymological data.

Related standards and references

• ISO 24613-1: LMF Core Model
• ISO 24613-2: MRD Model
• ISO 24613-3: Etymological Extension
• TEI P5 Guidelines (TEI Consortium)
• W3C XML Recommendation
• IETF BCP 47 (language tags)

Keywords: ISO 24613-4:2021, LMF TEI serialization, lexical markup framework, TEI P5, machine-readable dictionary, MRD, etymology, XML lexicon serialization, lexicon interoperability.