Nodes (OOM)

A node is the main element of the deployment diagram. It is a physical element that represents a processing resource, a real physical unit, or physical location of a deployment (computer, printer, or other hardware units).

In UML, a node is defined as Type or Instance. This allows you to define for example 'BackupMachine' as node Type, and 'Server:BackupMachine' as Instance. As a matter of simplification, PowerDesigner handles only one element, called node, which actually represents a node instance. If you need to designate the type, you can use a stereotype for example.

A node can be created in the following diagrams:

Deployment Diagram

The symbol of a node is a cube:

A node cannot contain another node, however it can contain component instances and file objects: the software component instances and/or associated file objects that are executed within the nodes. You can use shortcuts of component as well.

You can add a component instance from the node property sheet. You can display the list of component instances in the node symbol as well, by selecting the option Components in the node display preferences.

Composite View

You can add component instances and file objects to a node by dropping them onto the node symbol. By default, these sub-objects are displayed inside the symbol. To disable the display of these sub-objects, right click the node symbol and select Composite View > None. To redisplay them, select Composite View > Editable.

Creating a Node
You can create a node from the Toolbox, Browser, or Model menu.
Node Properties
To view or edit a node's properties, double-click its diagram symbol or Browser or list entry. The property sheet tabs and fields listed here are those available by default, before any customization of the interface by you or an administrator.
Node Diagrams
You can create deployment diagrams within a node to visualize the component instances and file objects it contains.

Parent topic: Implementation Diagrams