Advances in Conceptual Modeling - Challenging Perspectives: by Stefan Jablonski, Roland Kaschek, Bernhard Thalheim (auth.),

By Stefan Jablonski, Roland Kaschek, Bernhard Thalheim (auth.), Carlos Alberto Heuser, Günther Pernul (eds.)

This booklet constitutes the refereed joint complaints of 8 overseas workshops held together with the twenty eighth foreign convention on Conceptual Modeling, ER 2009, in Gramado, Brazil, in November 2009.

The 33 revised complete papers awarded have been rigorously reviewed and chosen from a hundred submissions. issues addressed by means of the workshops are energetic conceptual modeling of studying (ACM-L), conceptual modeling within the huge (CoMoL), evolving theories of conceptual modeling (ETheCoM), workshop on foundations and practices of UML (FP-UML), joint foreign workshop on metamodels, ontologies, semantic applied sciences, and knowledge structures for the semantic net (MOST-ONISW), caliber of data platforms (QoIS), standards, Intentions and pursuits in conceptual modeling ( RIGiM) and semantic and conceptual matters in geographic details platforms (SeCoGIS).

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Extra resources for Advances in Conceptual Modeling - Challenging Perspectives: ER 2009 Workshops CoMoL, ETheCoM, FP-UML, MOST-ONISW, QoIS, RIGiM, SeCoGIS, Gramado, Brazil, November 9-12, 2009. Proceedings

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We have developed extended versions of each of those metrics. We have evaluated both versions of those methods in two large real-world schemas. The two main conclusions are: (1) Among the original versions of the methods, the methods of choice are those based on the link analysis following the same approach than Google’s PageRank; and (2) The extended versions of most methods produce remarkably similar results, which does not happen in the original version. We plan to continue this work in two main directions.

4 Collection Constructors for Schemata While all operators discussed so far have arity 1 or 2, the collection constructions apply to any number k of schemata. If S1 , . . , Sk are schemata without name clashes, we can build the set schema {S1 , . . , Sk }, provided the element schemata are pairwise distinct, the multiset schema S1 , . . , Sk , the list schema [S1 , . . , Sk ], and the tree schema S1 , . . , Sk . e. the join with empty views, of the element schemata, while a tree schema contains an additional relationship type with k components that are root types of the element schemata.

ER 2009 Workshops, LNCS 5833, p. 33, 2009. © Springer-Verlag Berlin Heidelberg 2009 Is It Important to Explain a Theorem? br 1 Introduction Description Logics (DL) are quite well-established as underlying logics for KR. ALC is a basic description logic. ER and UML are among the most used semiformal artifacts in computer science. The DL-community has shown that one needs to go a bit further to reason on ER and UML models. ALCQI is able to express most of the features involved in an ER and UML modeling.

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