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The structure of thesauri is controlled by international standards that are among the most influential ever developed for the library and information field.
The main three standards define the relations to be used between terms in:
The general principles in ISO 2788 are considered language- and culture-independent. As a result, ISO 5964:1985, refers to ISO 2788 and uses it as a point of departure for dealing with the specific requirements that emerge when a single thesaurus attempts to express "conceptual equivalencies" among terms selected from more than one natural language.
The ISO standards for thesauri (ISO 2788 and ISO 5964:1985) are developed and maintained by the International Organization for Standardization, Technical Committee 46 whose remit is Information and Documentation. ISO 5964:1985 is currently undergoing review by ISO TC46/SC 9, and it is expected that among changes to it will be the inclusion of a standard interchange format for thesauri.
To facilitate the growth of the Semantic Web, it would be sensible to try to ensure that such an interchange format is as compatible with Semantic Web ontology representations as possible.
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