Grouping in XML [chapter]

Stelios Paparizos, Shurug Al-Khalifa, H. V. Jagadish, Laks Lakshmanan, Andrew Nierman, Divesh Srivastava, Yuqing Wu
2002 Lecture Notes in Computer Science  
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.
doi:10.1007/3-540-36128-6_8 fatcat:mhxig5kwqbe5pjkor4zmbyuqjm