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

Standard No.

BS ISO 24613-1:2024

Release Date

2024

Published By

British Standards Institution (BSI)  GB  /  BSI

Latest

BS ISO 24613-1:2024

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Introduction

Standard Evolution and Technical Background

BS ISO 24613-1:2024, as the UK national implementation version of ISO 24613-1:2024, replaces the 2019 version of the standard. This standard was developed by Technical Committee TS/1, and the main updates include:

Version	Core Changes	Technical Impact
2019 Edition	Initial Release	Establish basic model framework
2024 Edition	1. Correct the cardinality of OrthographicRepresentation class 2. Remove the type attribute of CrossREF class 3. Unify the class name style	Improve model accuracy Simplify implementation complexity Enhance standard consistency

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Core model architecture

LMF core package uses UML modeling language and includes the following key components:

1. Basic class structure

• LexicalResource: top-level container, managing multiple dictionaries
• Lexicon: single language dictionary entity, including GlobalInformation metadata
• LexicalEntry: supports subclassing, associating Form and Sense classes

2. Key association models

Association type	Cardinality	Application example
LexicalEntry → Form	0..*	Arabic root associated with multiple word forms
Sense → Definition	0..*	Multilingual definition management
CrossREF association	n:n	Synonym network construction

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Data Category Selection (DCS) Mechanism

The standard adopts a flexible data category management strategy:

1. Standardized data categories

• Language encoding: Mandatory use of ISO 639 standard
• Character encoding: must comply with Unicode specifications
• Grammatical features: includes 24 predefined categories such as grammaticalGender

2. User extension mechanism

It is allowed to add new data categories through User-defined data categories, which must meet the following requirements:

1. Do not conflict with existing categories
2. Explicitly define the value range
3. Document the mapping relationship

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Implementation suggestions

1. Model simplification principle

• Monolingual dictionaries are recommended to use subclassing
• Complex multilingual resources should use the DCS mechanism first
• Global attributes should be stored in the LexiconInformation class

2. Cross-dictionary interaction

Verification is required when exchanging data:

Comparison dimensions	Key points to check
Structural equivalence	Whether class inheritance relationships are compatible
Data category coverage	Whether metadata is completely mapped
Extension package dependency	Whether additional extension specifications are needed

BS ISO 24613-1:2024 Referenced Document

• ISO 15924 Information and documentation — Codes for the representation of names of scripts — Amendment 1
• ISO 639 Code for individual languages and language groups

BS ISO 24613-1:2024 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

Standard and Specification