Chapter 3 Building an XML model
An identity constraint selector specifies an XPath expression that selects a set of elements for an identity constraint (unique, key or keyRef).
An XPath expression is limited to a subset of the full XPath language defined in the W3C Recommendation XML Path Language 1.0.
An XPath expression allows you to locate a node (an element with its ramifications) in the hierarchical tree structure of an XML document.
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