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Overview:

Finding the occurrences of structural patterns in XML data is a key operation in XML query processing. Existing algorithms for this operation focus almost exclusively on path-patterns or tree-patterns. Requirements in flexible querying of XML data have motivated recently the introduction of query languages that allow a partial specification of path-patterns in a query. This paper focuses on the efficient evaluation of partial path queries, a generalization of path pattern queries. The approach explicitly deals with repeated labels (that is, multiple occurrences of the same label in a query). They show that partial path queries can be represented as rooted dags for which a topological ordering of the nodes exists.

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Format:PDFSize:200 KB
Date:Apr 2008
Pages:10

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