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This document defines the General Feature Model (GFM) as the metamodel for creating application schemas in the context of geo-information modelling. The GFM is explained and implemented as rules for creating and documenting application schemas, including principles for the definition of features.This document is applicable to:— conceptual modelling of features and their properties from a universe of discourse;— definition of application schemas;— general rules for using a conceptual schema language for application schemas;— rules for application schemas using UML as the conceptual schema language;— 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.This document does not apply to:— choice of one particular conceptual schema language for application schemas;— definition of any particular application schemas;— 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.