Control State Diagrams (CSD) are a graphical representation of Control State Abstract State Machines, a subclass of Abstract State Machines (ASM). We extend the existing semi-formal specification of this diagram type by a concrete syntax and its formal semantics. The semantics is given by a translation approach that transforms combinations of nodes into ASM snippets which are inserted into a textual ASM. This node-by-node translation is not only the basis for a code generation tool, but it also allows users to capture the behavior of a CSD more easily.
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