ABSTRACT
ABSTRACT: This paper describes the problems found in geographic databases design during the conceptual modeling of real world elements that are related by a network structure. It is believed that is possible to reach a better quality of the geographical data if spatial integrity constraints about the elements on a network are specified in a conceptual level. Hence, the purpose of this paper is to expand the UML-GeoFrame conceptual data model with specific constructors to allow modeling network elements, added by a formal specification of integrity constraints. The extension of the UML-GeoFrame data model includes the definition of stereotypes to allow an easier reading of the schema and the use of the Object Constraint Language (OCL) to a complementary specification of the spatial integrity constraints. An example of an electric power company diagram is used to illustrate the extension proposed.
