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The Impreciseness of UML and Implications for ModelicaML

The Modelica community has long pursued the vision of Integrated Whole Product Modelling. This implies the ability to integrate best practice modelling languages and techniques. With ModelicaML a first step towards an open integration within the sphere of the Eclipse Modelling Framework exists. This paper argues for a development direction of ModelicaML that creates a small core with well-defined semantics, instead of the current version that is based on an extension of SysML. To this end, modelling standards and their practicabilities are discussed and exemplified through a usage scenario.