Abstract
A closer integration of XML and database systems is actively pursued by researchers and vendors because of the many practical benefits it offers. Additional special benefits can be achieved on temporal information management – an important application area that represents an unsolved challenge for relational databases [1]. Indeed, XML data model and query languages support: Temporally grouped representations that have long been recognized as a natural data model for historical information [2], and Turing-complete query languages, such as XQuery [3], where all the constructs needed for temporal queries can be introduced as user-defined libraries, without requiring extensions to existing standards.
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