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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.

According to Onema and IOWater, and Wikipedia