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Tree logical classes for efficient evaluation of XQuery
Proceedings of the 2004 ACM SIGMOD international conference on Management of data - SIGMOD '04
XML is widely praised for its flexibility in allowing repeated and missing sub-elements. However, this flexibility makes it challenging to develop a bulk algebra, which typically manipulates sets of objects with identical structure. A set of XML elements, say of type book, may have members that vary greatly in structure, e.g. in the number of author sub-elements. This kind of heterogeneity may permeate the entire document in a recursive fashion: e.g., different authors of the same or differentdoi:10.1145/1007568.1007579 dblp:conf/sigmod/PaparizosWLJ04 fatcat:3qsqn74txrcijoqucksqzozt2y