The Constraints tab contains the following tools:
Tool
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Description
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![](../image/penoba1314176319318_19-rad1232636988301.image)
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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.
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![](../image/penoba1314176319318_19-rad1232636990051.image)
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Add Unique Constraint - The element value must be
unique or null within the specified scope.
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![](../image/penoba1314176319318_19-rad1232636992223.image)
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Add KeyRef Constraint - The element value corresponds to those of the specified key or unique constraint
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For general information about creating objects, see Core Features Guide > Modeling with PowerDesigner > Objects.