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There are four common mechanisms of UML

1. Specifications

2. Adornments

3. Common divisions

4. Extensibility mechanisms

Specification

Specification that provides a textual statement of the syntax and semantics of that building block. The UML's specifications provide a semantic backplane that contains all the parts of all the models of a system, each part related to one another in a consistent fashion

Adornments

Adornment Most elements in the UML have a unique and direct graphical notation that provides a visual representation of the most important aspects of the element. A class's specification may include other details, such as whether it is abstract or the visibility of its attributes and operations. Many of these details can be rendered as graphical or textual adornments to the class's basic rectangular notation.


Extensibility Mechanisms

The UML's extensibility mechanisms include

1. Stereotypes

2. Tagged values

3. Constraints

Stereotype

· Stereotype extends the vocabulary of the UML, allowing you to create new kinds of building blocks that are derived from existing ones but that are specific to your problem

· A tagged value extends the properties of a UML building block, allowing you to create new information in that element's specification

· A constraint extends the semantics of a UML building block, allowing you to add new rules or modify existing ones

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