After having introduced several theoretical concepts to formally describe a system property; the development of a dedicated library is explained and illustrated on an industrial example taken from the aeronautics domain. Some checks of system properties are thus performed by co-simulating behavioral and properties models. Finally; some extensions of the Modelica language are advocated in order to improve the applicability range and efficiency of properties modeling for complex systems; and especially to increase the rigor of their validations by enabling formal proofs.
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