There are several notations to build a model: textual, graphical and by using mathematics. The Object Management Group (OMG) has developed a graphical notation to model systems called SysML (system modeling language); this notation includes the modeling of the system requirements. In this paper a precise model of the requirements diagrams of SysML is presented. This model is made using a modeling language called Alloy, which has been used to formally specify UML diagrams.
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