From UML2.1.2 (includes [duplicated] and {contradictory} text as marked):

'Semantics
A component’s behavior may typically be realized (or implemented) by a number of Classifiers. In effect, it forms an abstraction for a collection of model elements. In that case, a component owns a set of Component Realization Dependencies to these Classifiers. [In effect, it forms an abstraction for a collection of model elements. In that case, a component owns a set of {Realization Dependencies} to these Classifiers].

It should be noted that for the purpose of applications that require multiple different sets of realizations for a single component specification, a set of standard stereotypes are defined in the UML Standard Profile. In particular, «specification» and «realization» are defined there for this purpose.'

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