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This International Standard defines the schema required for describing geographic information and services. It provides information about the identification, the extent, the quality, the spatial and temporal schema, spatial reference, and distribution of digital geographic data. This International Standard is applicable to: - the cataloguing of datasets, clearinghouse activities, and the full description of datasets; - geographic datasets, dataset series, and individual geographic features and feature properties. This International Standard defines: - mandatory and conditional metadata sections, metadata entities, and metadata elements; - the minimum set of metadata required to serve the full range of metadata applications (data discovery, determining data fitness for use, data access, data transfer, and use of digital data);- optional metadata elements – to allow for a more extensive standard description of geographic data, if required; - a method for extending metadata to fit specialized needs.