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The most prominent example of a Layer 2 Meta-Object Facility model is the UML metamodel, which describes the UML itself. These M2-models describe elements of the M1-layer, and thus M1-models. These would be, for example, models written in UML. The last layer is the M0-layer or data layer. It is used to describe runtime instances of the system. [28]
In software engineering, a class diagram [1] in the Unified Modeling Language (UML) is a type of static structure diagram that describes the structure of a system by showing the system's classes, their attributes, operations (or methods), and the relationships among objects. The class diagram is the main building block of object-oriented modeling.
UML is a graphical language for visualizing, specifying, constructing, and documenting information about software-intensive systems. [3] UML gives a standard way to write a system model, covering conceptual ideas. [4] [note 2] With an understanding of modeling, the use and application of UML can make the software development process more efficient.
Executable UML (xtUML or xUML) is both a software development method and a highly abstract software language. It was described for the first time in 2002 in the book "Executable UML: A Foundation for Model-Driven Architecture". [1] The language "combines a subset of the UML (Unified Modeling Language) graphical notation with executable ...
The C4 model is a lean graphical notation technique for modeling the architecture of software systems. [1][2] It is based on a structural decomposition (a hierarchical tree structure) of a system into containers and components and relies on existing modelling techniques such as Unified Modeling Language (UML) or entity–relationship diagrams ...
UML tool. A UML tool is a software application that supports some or all of the notation and semantics associated with the Unified Modeling Language (UML), which is the industry standard general-purpose modeling language for software engineering. UML tool is used broadly here to include application programs which are not exclusively focused on ...