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This is the default position of the Properties view. For the different types of selection nodes and edges corresponding tabs are provided.

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Empty Area

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General information about an opened diagram is shown, and can be edited if no object is selected.

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Nodes

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Information about nodes is shown, and can be edited if a node is selected. Also, stereotypes can be applied.

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Edges

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Information about edges is shown, and can be edited if a edge (connector, relation) is selected. You can also specify the kind of aggregation that applies to the properties.