Grouping In Xml

S Paparizos,S Al-Khalifa,Hv Jagadish,L Lakshmanan,A Nierman,D Srivastava,Yq Wu

EDBT '02: Proceedings of the Worshops XMLDM, MDDE, and YRWS on XML-Based Data Management and Multimedia Engineering-Revised Papers（2002）

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摘要

XML permits repeated and missing sub-elements, and missing attributes. We discuss the consequent implications on grouping, both with respect to specification and with respect to implementation. The techniques described here have been implemented in the TIMBER native XML database system being developed at the University of Michigan.

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关键词

Pattern Tree, Input Tree, Witness Tree, Selection List, XQuery Expression

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