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Defining identity constraints
For example:
Generated schema:
The KEYREF_UNIGOLD keyRef, defined on the product element, by reference to the UNIGOLD unique constraint, specifies that the gold attribute must be unique or null within the component_2 element, as well as it must be unique or null within the component_1 element (See UNIGOLD).
To display a keyRef property sheet,
Browser tree view.
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