ISO 25964-1:2011

Overview

ISO 25964-1:2011 - Information and documentation: Thesauri and interoperability with other vocabularies - Part 1: Thesauri for information retrieval - provides international recommendations for developing, maintaining and exchanging thesauri used in information retrieval. It applies to monolingual and multilingual thesauri across all media (text, audio, images, physical objects, multimedia), and to systems such as bibliographic databases, knowledge bases, portals, museum collections and digital repositories. The standard also defines a data model and recommended exchange format (see Annex B XML Schema) to support import/export and interoperability.

Key topics and technical requirements

• Thesaurus design and objectives: guidance on vocabulary control, concept definition, scope notes and paradigmatic vs. syntagmatic relationships.
• Terms and form: rules for preferred and non-preferred terms, grammatical form, capitalization, punctuation, singular/plural choices and disambiguation.
• Complex concepts and compound terms: criteria for admitting, splitting or retaining multi-word concepts and consistency rules.
• Equivalence and cross-language mapping: treatment of synonyms, quasi-synonyms and degrees of equivalence across languages for multilingual thesauri.
• Concept relationships: hierarchical (broader/narrower), associative and customized relationships for navigation and retrieval.
• Facet analysis and presentation: recommendations for organizing facets, display styles and multilingual layout considerations (character encoding, language tags).
• Thesaurus management and software: planning, construction, maintenance, updating, editorial safeguards, housekeeping tools and size/character limits for management systems.
• Data model and exchange: a formal data model plus recommended exchange formats and protocols to enable import/export and integration with other systems.
• Integration with applications: interoperability requirements for indexing, searching and content management systems to enable consistent indexing and better retrieval.

Practical applications and target users

Who benefits:

• Librarians and cataloguers
• Information architects and knowledge managers
• Metadata specialists and digital curators (museums, archives)
• Developers of search, indexing and content management systems
• Standards implementers and interoperability engineers

Practical benefits:

• Improves retrieval precision and recall by enforcing controlled vocabulary and consistent indexing practices.
• Enables multilingual search and cross-language discovery through defined equivalence mechanisms.
• Facilitates system integration using the standard’s data model and exchange formats (XML Schema) for thesaurus import/export.
• Supports sustainable maintenance via recommended processes for updates, editorial workflows and software features.

Related standards

• ISO 25964 (general) - Part 2 (interoperability with other vocabularies) addresses mappings with classification schemes, authority lists and ontologies.
• ISO 25964-1 supersedes earlier thesaurus standards (ISO 2788:1986 and ISO 5964:1985).

Using ISO 25964-1:2011 helps organizations create interoperable, maintainable thesauri that integrate with modern information retrieval systems and support consistent, multilingual discovery.