What is true about UML stereotypes ?
Stereotype is used for extending the UML language.
UML provides three extension mechanisms: stereotypes, tagged values and constraints. A stereotype, written in guillemets such as «interface», «entity» or «controller», creates a new kind of model element from an existing one.
So the purpose of a stereotype is to extend the vocabulary of UML for a particular domain without changing the UML metamodel itself; the statement about extending the UML language is true.
A stereotyped class need not be abstract (an «entity» class is usually concrete); a stereotype adds meaning and does not freeze or lock the element against change; and stereotypes are packaged inside profiles, rather than profiles being stereotyped for backward compatibility. These statements are false.
Hence, the answer is Stereotype is used for extending the UML language..
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