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Defining derivations
114 PowerDesigner
The General page of a simple type union property sheet displays the
following properties:
Property Description
ID ID of the simple type union. Its value must be of type ID and
unique within the model containing the simple type union
Member Types White space separated list of built-in data types. Values must be
qualified names (See Glossary)
The Union Types page of a simple type union property sheet displays a list
where you can add simple types using the Add Simple Type tool.
To define a simple type derivation by union:
1 Select Union in the Derivation dropdown listbox of a simple type
property sheet.
2 Click Apply.
3 Click the Properties tool beside the Derivation box.
The simple type union property sheet appears.
4 Type an ID and member types for the simple type union.
5 Click OK.
Union general
properties
Union types
properties