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Maintains a reference to the diagram itself
Has type, visibility, and mutable attributes
Maintains a list of all Style s applied to the element
Maintains a list of source and target Edge s
The Diagram is the top-level container of views that has a name,
MeasurementUnit , and containment references to all Edge s. Note that, as with
View children, Diagram Edge s are either transient or persistent and are main-
tained in separate containment references.
A Node element is a View that can be composed in a container view and
that can contain a LayoutConstraint . A layout manager uses a
LayoutConstraint to set the Bounds of the Node 's visuals. The Bounds ele-
ment holds size and position information.
Figure 10-21
Diagram notation model
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