Alf (Action Language for Foundational UML) is essentially a textual notation for UML behaviors that can be attached to a UML model in any place where a UML behavior can be specified. Alf Input text serves as a concrete representation for UML model elements within the fUML, allowing for behavioral modeling using a textual surface notation. This facilitates a model-driven process capable of generating fully executable source code, thus integrating structural modeling with behavioral modeling12. Alf allows for detailed behavioral specification in a textual form as opposed to the more cumbersome graphical activity diagram notation, making it a practical tool for specifying the operational behavior of a system within the UML framework2.
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