Unified Modeling Language (UML) has been widely accepted in the software engineering area, because it provides most of the concepts and notations that are essential for documenting object-oriented models. However, UML does not have an explicit format to describe and interchange its model information intentionally. This paper addresses the UML model interchange and presents our efforts to make UML highly interoperable. We developed an interchange format called UXF (UML eXchange Format) based on XML (Extensible Markup Language). UXF is a simple and well-structured format to encode UML models. It leverages the tool interoperability, team development and reuse of design models by interchanging the model information with the the XML standard. Also, we propose an open distribution platform for UML models, which provides multiple levels of interoperability of UML models. Our work shows an important step in the evolution for the interoperable UML.
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