Unified Modeling Language
The Unified Modeling Language (UML) is a graphical language for visualizing, specifying, constructing, and documenting the artifacts of a software-intensive system. UML offers a standard way to write a system’s blueprints, including conceptual things such as business processes and system functions as well as concrete things such as programming language statements, database schemas, and reusable software components .
The UML is based on earlier software design approaches, among them the Object Modeling Technique (OMT) , Object-Oriented Analysis and Design (OOAD) , and Object-Oriented Software Engineering (OOSE)  and other important techniques . The UML was standardized in various versions by the Object Modeling Group (OMG) . Authors of the predecessor techniques have published a comprehensive description of the UML . Questions strongly related to UML are discussed at the UML and MODELS...
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