The semantics define, in a technology independent manner, how the UML concepts are to be realized by computers.
Providing a detailed explanation of the semantics of each UML modeling concept.The abstract syntax defines the set of UML modeling concepts, their attributes and their relationships, as well as the rules for combining these concepts to construct partial or complete UML models. Setting a formal definition of a common Meta-Object Facility (MOF)-based meta-model that specifies the abstract syntax of the UML.However, to enable meaningful exchange of model information between tools, agreement on semantics and notation is required. Advancing the state of the industry by enabling object visual modeling tool interoperability.
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