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Model Snippet of the Day: Graphics Elements

xtUML has a model of graphics. Here is a simplified version of it. This model abstracts out very far and distinguishes only diagram, widget, figure, connector and junction.

A diagram depicts widgets. A widget is either a figure (shape) or a coupler (connector). Couplers connect widgets together, meaning that a coupler can have junctions between figures and/or other couplers.

Example figures are class, component, state.
Example couplers are association and transition.