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.