Chapter 3 Building an XML model
A keyRef constraint specifies that an element or attribute value (or set of values) corresponds to the value of a specified key or unique constraint.
A keyRef is a reference to a key or a unique constraint.
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, double-click its name or its icon in the Browser tree view.
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