ISO 25964
ISO 25964 is the international standard for thesauruses, published in two parts as follows: ISO 25964 Information and documentation - Thesauri and interoperability with other vocabularies Part 1: Thesauri for information retrieval [published August 2011] Part 2: Interoperability with other vocabularies [published March 2013] It was issued by ISO, the International Organization for Standardization, and its official website is maintained by its secretariat in NISO, the USA National Information Standards Organization. Each part of the standard can be purchased separately from ISO or from any of its national member bodies (such as ANSI, BSI, AFNOR, DIN, etc.).