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

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

This booklet constitutes the refereed lawsuits of the fifteenth overseas convention on complicated details platforms Engineering, CaiSE 2003, held in Klagenfurt, Austria in June 2003.

The forty five revised complete papers awarded including three invited contributions have been rigorously reviewed and chosen from 219 submissions. The papers are geared up in topical sections on XML, tools and versions for info platforms, UML, web enterprise and social modeling, peer-to-peer platforms, ontology-based equipment, complex layout of knowledge platforms, wisdom, wisdom administration, internet providers, information warehouses, digital agreements and workflow, necessities engineering, metrics and strategy engineering, and agent applied sciences and complicated environments.

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Additional info for Advanced Information Systems Engineering: 15th International Conference, CAiSE 2003 Klagenfurt/Velden, Austria, June 16–20, 2003 Proceedings

Example text

However, at the moment there has been no commonly agreed upon algebra defined for XML, let alone a projection operator, so the development of procedures for normalising XML documents is likely to be more complex than in the relational case. Fourthly, it is necessary to consider the case where both XFDs and XMVDs exist in a document. It is interesting to note that unlike the situation for the relational case, 4XNF is not a straightforward generalisation of the normal form for XFDs (XNF). This means that, in contrast to the relational case where 4NF implies BCNF in the case where both MVDs and FDs are present, in XML a different normal form from 4XNF is needed when the constraints on an XML document contain both XFDs and XMVDs.

An XML tree This leads us to the main definition of our paper. s. s. of the XMVD and all paths end in an attribute or text node. Definition 12. Let P be a consistent set of paths and let T be an XML tree that conforms to P and is complete. An XMVD is a statement of the form p →→ q|r where p, q and r are paths in P . T satisfies p →→ q|r if whenever there exists two distinct paths path instances v¯1 . ¯ vn and w ¯1 . w ¯n in P aths(q) such that: (i) val(¯ vn ) = val(w ¯n ); Multivalued Dependencies and a 4NF for XML vr E 21 root v8 E Id v1 E Course v2 E Id v3 E v5 Teacher v6 Id “Algorithms” v4 E “Fred” Teacher E “Mary” E Text “Text A” v7 E Text “Text B” Fig.

5. P. Buneman, S. Davidson, W. Fan, and C. Hara. Reasoning about keys for xml. In International Workshop on Database Programming Languages, 2001. 6. P. Buneman, S. Davidson, W. Fan, C. Hara, and W. Tan. Keys for xml. Computer Networks, 39(5):473–487, 2002. 7. P. Buneman, W. Fan, J. Simeon, and S. Weinstein. Constraints for semistructured data and xml. ACM SIGMOD Record, 30(1):45–47, 2001. 8. P. Buneman, W. Fan, and S. Weinstein. Path constraints on structured and semistructured data. In Proc. ACM PODS Conference, pages 129–138, 1998.

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