Abstract
Unified Modeling Language (UML) provides various diagrams to depict system characteristics and complex environment from different viewpoints and different application layers. It also contains a lot of standard elements with vague and sparse semantics. Researching how to combine Unified Modeling Language (UML) with formal method in order to improve UML semantic accuracy is a hotspot of researches in software engineering because of the half formal characteristic of UML. This paper defines Syntax Domains, Abstract Syntax, Semantic Domains, Semantic Functions of UML sequence diagram using Denotational Semantics, formally depicts sequence diagram on the function of the each syntax object of sequence diagram. It provides the foundation for accuracy and consistency validation of UML sequence diagram.
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