Semantics of UML 2.0 Activity Diagram for Business Modeling by Means of Virtual Machine

— The paper proposes a more formalized definition of UML 2.0 Activity Diagram semantics. A subset of activity diagram constructs relevant for business process modeling is considered. The semantics definition is based on the original token flow methodology, but a more constructive approach is used. The Activity Diagram Virtual machine is defined by means of a metamodel, with operations defined by a mix of pseudocode and OCL pre- and postconditions. A formal procedure is described which builds the virtual machine for any activity diagram. The relatively complicated original token movement rules in control nodes and edges are combined into paths from an action to action. A new approach is the use of different (push and pull) engines, which move tokens along the paths. Pull engines are used for paths containing join nodes, where the movement of several tokens must be coordinated. The proposed virtual machine approach makes the activity semantics definition more transparent where the toke...

• Type: Conference
• Year: 2005
• Where: EDOC
• Authors: Valdis Vitolins, Audris Kalnins
• Keywords: Activity Diagram, Activity Diagram Semantics, EDOC 2005, Operating System, Virtual Machine