unique ( XML Representation Element )
Names
unique
unique [ XML Schema Namespace ]
Subject Indicators
http://www.techquila.com/psi/xmlschema/representation-element/unique
Description
Used to define a uniqueness constraint on a type. The uniqueness constraint may apply to a single field or collection of fields relative to a selection of elements in the instance document. The selection of the elements and the fields to be unique are made using XPath expressions.