Database applications provide an XML view of their data so that the data is available to other applications, especially web applications. Database systems provide support for the client applications to use (query and/or manipulate) the data. The operations specified by the client applications are composed with the view definitions by the database system, thus performing these actions. The internal data model used by the database application, as well as how the operations are performed are transparent to the client applications; they see only an XML view of the entire system. XML views help the database systems to maintain their legacy data, as well as utilize the optimization features present in legacy systems (especially SQL engines), and at the same time make the data accessible to a wide range of web applications.
Views (external schema) are a feature  present universally in almost all database systems. Views provide data...
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