ISO 25964-2, the standard for interoperability of thesauri was published by ISO on March 4, 2013. 

The full title of Part 2 is ISO 25964-2  Information and documentation -- Thesauri and interoperability with other vocabularies -- Part 2: Interoperability with other vocabularies.

ISO 25964-2 deals with interoperability between thesauri and other vocabularies, especially the principles and practice of mapping between them. Interoperability is defined as the ability of two or more systems or components to exchange information, and to use the information that has been exchanged. Types of vocabulary to be considered include classification schemes (including those for records management), taxonomies, subject heading schemes, name authority lists, ontologies, terminologies, and synonym rings.

Important topics covered in the standard include structural models for mapping, guidelines on mapping types, and how to handle pre-coordination (which especially occurs in classification schemes, taxonomies and subject heading schemes).

Please see Press release at: http://nkos.slis.kent.edu/PressReleaseISO25964-2.pdf