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An entity type definition is a model of a particular component of the system that is being modeled.

 

An entity is a single, unique instance of that type  

 

Each entity type supports the basic system dynamics components:  stocks, flows, auxiliary variables, and lookup tables.  Ventity uses separate Data Entities to store data variables.  In addition, each entity type supports attributes which are used to identify individual entities, to aggregate into sub-collections, to connect to other entities, and to provide state information.  Entity types may also include triggers, which are able to cause actions to be performed.