ISO 19109:2005(E) defines rules for creating and documenting application schemas, including principles for the definition of features. Its scope 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.