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of data (messages), and the association of data artifacts to activities, it is not a data flow diagram.

Elements

BPMN models are expressed by simple diagrams constructed from a limited set of graphical elements. For both business users and developers, they simplify understanding of business activities' flow and process. BPMN's four basic element categories are:

; Flow objects
: Events, activities, gateways; Connecting objects
: Sequence flow, message flow, association;

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