Topic diagrams

A topic diagram is a non-editable, query-based diagram that you can use to view existing relationships between elements. A topic diagram displays a specific set of relationships between a group of given elements. The set of relationships, or the topic, defines the parameters of the query for the diagram.

The query and the context that you specify persists in the topic diagram. Each time that you open a topic diagram, the system queries the underlying elements and automatically populates the diagram with the moat recent results. However, if you make changes to the underlying elements when a topic diagram is open, the diagram might not represent the current status of the elements until you refresh the diagram manually.

You can select either a default or radial layout format for the topic diagram. The default layout shows all diagram elements in a hierarchy that can span several levels. The radial layout positions the selected diagram element that you used in your query as the hub, or context diagram element. Each diagram element is connected either directly or indirectly to the context element. The radial layout provides a view of all directly related diagram elements and spans one or two levels.

A topic diagram is similar to a browse diagram except that you can save a topic diagram and reopen it at any time. Unless you save a topic diagram as an editable diagram, you cannot add or modify the diagram elements.

Related tasks
Exploring relationships in UML models
Querying elements and relationships in UML models
Creating topic diagrams of UML elements
Customizing queries for existing topic diagrams
Refreshing topic and browse diagrams
Saving topic diagrams
Querying elements and relationships in applications
Creating topic diagrams of application elements
Saving browse diagrams
Browsing elements and relationships in applications

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