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XML has become ubiquitous, and XML data has to be managed in databases. The current industry standard is to map XML data into relational tables and store this information in a relational database. Such mappings create both expressive power problems and performance problems. In the TIMBER  project we are exploring the issues involved in storing XML in native format. We believe that the key intellectual contribution of this system is a comprehensive set-at-a-time query processing ability in adoi:10.1145/872757.872862 dblp:conf/sigmod/PaparizosACJLNPSWWY03 fatcat:kmq6yiwnojcu3kkbmohsobaxei