This International Standard defines rules for creating and documenting application schemas, including principles for the definition of features.The scope of this International Standard includes the following: - conceptual modelling of features and their properties from a universe of discourse; - definition of application schemas; - use of the conceptual schema language for application schemas; - transition from the concepts in the conceptual model to the data types in the application schema; - integration of standardized schemas from other ISO geographic information standards with the application schema.