Chapter 3 Building XML Models
You create constraints on the Constraints tab of an element, using one of the following tools:
| Tool | Description |
|---|---|
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Add Key Constraint - The element value must be a key within the specified scope. The scope of a key is the containing element in an instance document. A key must be unique, not null, and always present |
|
Add Unique Constraint - The element value must be unique or null within the specified scope |
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Add KeyRef Constraint - The element value corresponds to those of the specified key or unique constraint |
For general information about creating objects, see the chapter "Getting Started with PowerDesigner" in the General Features Guide .
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