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It is the extension mechanism of stereotypes that allows UML to be generally
described (i.e., unified ) and that it can be used in specific projects. This means
that the general UML vocabulary (e.g., use case) can be extended by adding
domain-specific, approach-specific, or project-specific vocabulary, such as secondary
use case ( ?«secondary?» ).
Table 3.4 The UML diagram types.
Diagram Name and Type Abbreviation
Activity diagram act
Use case diagram uc
Class diagram ??“
Package diagram pkg
Interaction diagram sd
State machine diagram stm
Defi nitions
A stereotype adds more properties and semantics to an existing model element.
A newly defined model element can also have a new notation, in addition
to its name.
A profi le is a set of stereotypes.
An extension extends a UML model element by additional properties that are
defined by stereotypes.
Of course, the UML model elements are very general. For example, there is a
class , but there is no system , or subsystem , or hardware unit , or software unit ,
and so on.


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