ISO 19109:2025

Geographic information — General feature model and rules for application schema

Scope

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.