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Keywords from shared vocabularies are critical for consistent data discovery interfaces. The NASA Global Change Master Directory has developed shared vocabularies that include consistent values for many important types of keywords. These vocabularies are used extensively throughout the GCMD community and are included in GCMD's Directory Interchange Format (DIF).

ISO 19115 includes a shared vocabulary (codelist) for keyword types that includes five values: discipline, place, stratum, temporal, and theme. This codelist was extended in ISO 19115-1 to include the GCMD keyword types and others: dataCentre, featureType, instrument, platform, project, service, product, subTopicCategory, taxon. This will allow direct translation of the GCMD keywords from the GCMD metadata into ISO, greatly simplifying the translation and, more importantly, maintaining a consistent conceptual interface for those users as they begin to use ISO.