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There are UML formalizations based on different languages that do not use an intermediate language. However, this extra step provides some advantages. NEREUS would eliminate the need to define formalizations and specific transformations for each different formal language. The metamodel specifications and transformations can be reused at many levels in MDA. Languages that are defined in terms of NEREUS metamodels can be related to each other because they are defined in the same way through a textual syntax.
Directions for further refinement of ontology building methods are discussed. Copyright © 2006, Idea Group Inc. Copying or distributing in print or electronic forms without written permission of Idea Group Inc. is prohibited. 42 Hakkarainen, Strasunskas, Hella, & Tuxen INTRODUCTION The vision for the next generation Web is the Semantic Web (Berners-Lee, Handler, & Lassila, 2001), where information is accompanied by meta-data about its interpretation so that more intelligent information-based services can be provided.
We define a system of transformation rules to bridge the gap between UML/OCL models and NEREUS. We propose to specify metamodel transformations independently of any technology. We investigate the way to define them using UML/OCL and NEREUS. We want to define foundations for MDA tools that permit designers to directly manipulate the UML/OCL models they have created. However, meta-designers need to understand metamodels and metamodel transformations. We are validating the “megamodel” through forward engineering, reverse engineering, model refactoring, and pattern applications.