Several approaches have been discussed in the past to manage semantic aspects of semi-formal conceptual models based on mappings of their elements to ontologies. In the paper at hand we describe the foundations for these approaches, derive requirements for an according tool support and present the design and implementation of the SeMFIS toolkit together with use cases where it has been successfully applied. In contrast to other approaches, SeMFIS is based on a meta modeling approach that can be easily adapted and extended to support arbitrary conceptual modeling languages. In addition it will be made freely available for the scienti�c community in the context of the Open Models Initiative.

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