Y. Ishikawa, T. Nagai, and H. Kitagawa (Japan)
XML, XPath, Query Transformation, Query Processing
The widespreading of XML as a content-description lan guage on the Web requires advanced processing and management techniques for huge XML databases. XPath is a standard language for extracting the specified ele ments from XML documents, and its efficient support is one of the key issues in the current XML database technology. In this paper, we propose an XPath query transformation method for the efficient query processing. It transforms top-down, navigation-based XPath queries into equivalent bottom-up query plans by using schema information. Based on this technique, we can achieve ef ficient set-oriented processing of XPath queries with the support of index mechanisms.
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