Conceptual Data Model

Diagram showing the structure of the information system from the data viewpoint, i.e. the dependencies or relationships between the different data of the information system: a conceptual data model (CDM) formally describes the data that will be used by the information system. The basic concepts are: entity (or object or class), relationship or association, properties or attributes, identifier. The National Service for Water Data and Reference-dataset Management (Sandre) develops data models in the data dictionary according to UML or Merise modelling.