THE NETWORK DATA MODEL

This model was standardized by the Committee on Data Systems 
Languages/Database Task Group (CODASYL/DBTG '71)

The graphical elements of the Network Model include nodes (for 
the data elements) and arcs with "crow's feet" that establish 
both the existence of the relationships and the cardinality 
(or "degree") of the relationship.

An old example of this model was found in IDMS by Cullinet.