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.The following are outside the scope:— choice of one particular conceptual schema language for application schemas;— definition of any particular application schema;— representation of feature types and their properties in a feature catalogue;— representation of metadata;— rules for mapping one application schema to another;— implementation of the application schema in a computer environment;— computer system and application software design;— programming.