By Ron Weber (auth.), Stefano Spaccapietra, Salvatore T. March, Yahiko Kambayashi (eds.)
For greater than two decades, the sequence of Conceptual Modeling – ER meetings has supplied a discussion board for examine groups and practitioners to provide and - swap study effects and functional reviews within the ?elds of database layout and conceptual modeling. in the course of the years, the scope of those meetings has prolonged from database layout and speci?c issues of that zone to extra u- versal or re?ned conceptual modeling, organizing initially susceptible or ill-structured details or wisdom in additional cultured methods via utilizing different types of rules, summary types, and theories, for di?erent reasons. even as, many technically orientated methods were constructed which goal to facilitate the implementation of fairly complex conceptual types. Conceptual modeling is predicated at the strategy of conceptualization, and it's the center of method structuring in addition to justi?cation for info platforms improvement. It helps and enables the knowledge, rationalization, pred- tion, and reasoning on info and information, and their manipulation within the platforms, as well as realizing and designing the services of the structures. The conceptualization strategy goals at developing thoughts proper for the information and knowledge procedure in query. recommendations within the human brain and notion descriptions in automatic info platforms are relatively di?erent issues by way of nature, yet either will be taken into consideration in conceptual modeling. often notion descriptions are adequately saw, yet strategies within the human brain and their houses are frequently missed really carelessly.
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Additional resources for Conceptual Modeling — ER 2002: 21st International Conference on Conceptual Modeling Tampere, Finland, October 7–11, 2002 Proceedings
23 Acknowledgement We are thankful to the reviewers requesting to sharpen the proﬁle of the paper and to concentrate on component construction theory. We acknowledge the eﬀorts of members of DBIS groups and of our cooperation partners engaged in the development and application of the database design workbenchs (DB)2 and RADD, employed in modeling or developing dozens of large database applications or participating in more than 30 projects for development of large information-intensive websites.
Composition is based on constructors used for deﬁnition of HERM types: Composition through association is based on the (Cartesian) product constructor (or tuple constructor). It is used for direct association of database components. , with views on the combined schema. Thus, we may use the join constructor ✶InputV iew1 :=OutputV iew2 or in detail ✶(I1,2 V :=O V )∧(I V :=O V ) 2,1 2,1 1,2 for the composition C1 ⊗ C2 = (I V , OV , Σ, ∆) with the association of the V V view I1,2 of the ﬁrst component to the view O2,1 of the second component V V and of I2,1 to O1,2 , correspondingly, instead of the Cartesian product.
Associating through linking and referencing: Association is based on a variety of link properties such as potential integration, existence constraints, referential integrity with enforcement or with assurance, and citations without integrity. Furthermore, functionality of destination component may be inherited. General schema join: Association may be based on cooperating views [Tha00a]. The data exchange is explicitly speciﬁed by views on the views which are type-compatible and through which functionality is partially exported.
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