«Material» relation can be completely derived (via «Derivation») from the «Relator» and the corresponding «Mediation» relations. Derivation makes the cardinality constraints of the mediation relations collapse (see «Material» relation, example 2).

Also, several «Material» relations can be derived from a single «Relator» and «Mediation» relations (see «Material» relation, example 1).

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EX1: Example Treatment

For more examples see «Relator», «Material», and Relator pattern.

Quoted from:

GUIZZARDI, Giancarlo. Introduction to Ontological Engineering. [presentation] Prague: Prague University of Economics, 2011.