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XML views define an XML-centric view of a subset of the data stored in your relational database. You define an XML view by adding annotations to an XML schema to form a mapping schema. In "Filtering Values in XML Views," November 2002, InstantDoc ID 26715, and "Defining XML Views," December 2002, InstantDoc ID 27106, I showed you how to use several annotations to map data from the rows and columns of database tables to a virtual XML document that your mapping schema defines. In this column, I show you how to use XML's built-in support for ID and IDREF attributes, which function like keys and foreign keys in your database, and IDREFS, which lets you specify one-to-many (1:M) relationships.
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