Advanced Information Systems Engineering: 15th International by Marek Rusinkiewicz (auth.), Johann Eder, Michele Missikoff

By Marek Rusinkiewicz (auth.), Johann Eder, Michele Missikoff (eds.)

This e-book constitutes the refereed court cases of the fifteenth foreign convention on complex details platforms Engineering, CaiSE 2003, held in Klagenfurt, Austria in June 2003.

The forty five revised complete papers offered including three invited contributions have been conscientiously reviewed and chosen from 219 submissions. The papers are geared up in topical sections on XML, equipment and types for info structures, UML, net enterprise and social modeling, peer-to-peer platforms, ontology-based tools, complex layout of data structures, wisdom, wisdom administration, net prone, info warehouses, digital agreements and workflow, necessities engineering, metrics and process engineering, and agent applied sciences and complicated environments.

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People & 14 & 11 item &3 &7 & 13 nam e person & 15 & 22 buyer &9 nam e & 16 person profile & 19 & 27 pric e & 18 profile &8 & 32 open_auc tions c losed_auc tion & 23 item id site & 26 buyer & 28 c losed_auc tion pric e & 26 & 24 annotation & 29 annotation & 33 open_auc tion & 34 bidder & 35 annotation & 36 desc ription & 25 desc ription inc om e inc om e & 17 & 20 & 30 desc ription Fig. 1. 2 XML Schema Graph Although XML data is self-descriptive, Document Type Definition (DTD) is proposed by W3C to further and explicitly constrains XML data, for example, an element should contain what kind of and/or how many sub-elements.

We firstly gave a definition of XMVDs in XML using an extension of the approach used in [19,20]. We then proposed a normal form for XML documents in the presence of XMVDs and justified it by showing that it ensures the elimination of redundancy for an important class of XMVDs, namely what we call hierarchical MVDs. Hierarchical XMVDs are a natural extension of hierarchical multivalued dependencies that appear in relational and nested relational models. There are several other issues related to the ones addressed in this paper that warrant further investigation.

4 Optimizing Regular Path Expressions In Section 3, we have introduced the basic idea of extent join that uses joins over sets to evaluate path expression queries. Its performance depends largely on the number of joins and the size of joining sets. In this section, we present two path expression optimization techniques to reduce the number of joins and the execution cost of path expressions when evaluating a path expression. Meanwhile, the general cost based optimization procedure is also introduced in this section.

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