A prevalent challenge of modeling and simulation is to make a model reusable by someone else than the original developer. This paper presents composition structures and interface descriptions for discrete-event models. Interfaces are introduces as separate units of descriptions that complement model definitions. As XML documents, interfaces may be stored in databases to search, select, and analyze composition candidates based on public visible property descriptions. A meta model formalizes interfaces, components, and compositions, such that the refinement of interfaces into model implementations and the compatibility of interfaces can be analyzed. The composition approach combines different hierarchical relations (type hierarchies, refinement hierarchies, and composition hierarchies) to simplify the modeling process and thereby increase accuracy and decrease efforts.
