BS ISO 24613-1:2019 - Language resource management. Lexical markup framework (LMF). Core model

Standard No.: BS ISO 24613-1:2019
Release Date: 2020
Published By: British Standards Institution (BSI) GB / BSI
Status: Be replaced 2024-01
Replace By: BS ISO 24613-1:2024
Latest: BS ISO 24613-1:2024

Introduction

Standard Technology Evolution and Background

As a comprehensive revision of ISO 24613:2008, the 2019 version of the LMF standard is released in parts. The core model (Part 1) adds the LexiconInformation and GrammaticalInformation classes, refactors the original Representation class into the OrthographicRepresentation class, and introduces the cross-reference (CrossREF) metamodel, which significantly improves the support for multilingual dictionary interoperability.

Core Model Architecture Analysis

Core Classes	Inherited Characteristics	Key Data Categories
LexicalResource	No Subclassing	languageCoding/scriptCoding
LexicalEntry	Allow Subclassing	formType/partType
OrthographicRepresentation	Allow Subclassing	representationType/xml:lang

Data category selection mechanism

The standard achieves flexible modeling through DCS (Data Category Selection):

Standardized allocation: mandatory use of ISO 639 language codes and ISO 15924 text codes
User customization: extend special needs through User-defined data categories
Typed implementation: equivalent modeling can be achieved through subclass instantiation (such as Lemma subclass) or through data category assignment

Application case: In the development of Arabic dictionaries, the same root word can be associated with multiple LexicalEntry objects, and morphological annotation is implemented through the formStructure=root data category.

Cross-model reference specifications

The CrossREF package provides three types of key constraints:

Reference type: internal/external
Relation type: 12 preset values such as synonym/antonym/variant
ID specification: Supports multiple identifier systems such as IRI/URI/URL

Implementation suggestions

Model simplification principle based on clause 5.5.6 of the standard:

Scenario	Recommended solution	Risk of data loss
Monolingual dictionary	Prefer subclass inheritance	Low
Multilingual database	Focus on data category selection	Requires verification of metadata compatibility
Machine Readable Dictionary (MRD)	Combined with OrthographicRepresentation subclassing	Medium

BS ISO 24613-1:2019 Referenced Document

ISO 15924 Information and documentation — Codes for the representation of names of scripts — Amendment 1
ISO 16642 Management of terminology resources — Terminological markup framework*， 2025-12-10 Update
ISO 639 Code for individual languages and language groups*， 2023-11-01 Update

BS ISO 24613-1:2019 history

2024 BS ISO 24613-1:2024 Language resource management. Lexical markup framework (LMF) - Core model
2020 BS ISO 24613-1:2019 Language resource management. Lexical markup framework (LMF). Core model

Language resource management. Lexical markup framework (LMF). Core model

BS ISO 24613-1:2019 Language resource management. Lexical markup framework (LMF). Core model