Flexible Query Answering Systems: 7th International by Jef Wijsen (auth.), Henrik Legind Larsen, Gabriella Pasi,

By Jef Wijsen (auth.), Henrik Legind Larsen, Gabriella Pasi, Daniel Ortiz-Arroyo, Troels Andreasen, Henning Christiansen (eds.)

This e-book constitutes the refereed lawsuits of the seventh foreign convention on versatile question Answering structures, FQAS 2006, held in Milan, Italy in June 2006.

The 60 revised complete papers provided have been rigorously reviewed and chosen from quite a few submissions. The papers are prepared in topical sections on flexibility in database administration and querying, vagueness and uncertainty in XML querying and retrieval, info retrieval and filtering, multimedia info entry, person modeling and personalization, wisdom and information extraction, clever details extraction from textual content, and information illustration and reasoning.

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1 only two patterns: V10 and V11 . Based on these, we rewrite the query by a single join (more exactly, a cartesian product) of the corresponding V10 and V11 views, likely to be much less expensive than the other approaches. Is a formal model required to describe pattern extraction ? The answer is yes, because one needs to model precisely (i) query semantics, typically using an algebra [7, 17, 22] and (ii) view semantics; in [4] we provided the full algebraic semantic of patterns such as those in Fig.

We assume available an ID scheme I, that is, an injective function assigning to every node a value in I. Figure 2 shows a simple XML document, where nodes are given structural ORDPATH identifiers [20]. We will rely on a nested relational model [1] as follows. The value of a tuple attribute is either a value from A, or null (⊥), or a collection (set, list or bag) of homogeneous tuples. Notice the alternation between the tuple and the collection constructors. We use lowercase letters for relation names, and uppercase letters for attribute names, as in r(A1 , A2 (A21 , A22 )).

C. Moerkotte. Full-Fledged Algebraic XPath Processing in Natix. In ICDE, 2005. 8. N. Bruno, N. Koudas, and D. Srivastava. Holistic twig joins: Optimal XML pattern matching. In SIGMOD, 2002. 9. Z. V. Jagadish, L. Lakshmanan, and S. Paparizos. From tree patterns to generalized tree patterns: On efficient evaluation of XQuery. In VLDB, 2003. 10. B. Cooper, N. Sample, M. Franklin, G. Hjaltason, and M. Shadmon. A fast index for semistructured data. In VLDB, 2001. 11. A. Deutsch and V. Tannen. MARS: A system for publishing XML from mixed and redundant storage.

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