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Complete Component Type

subsume several implementations to one type Why? compare implementations, exchange one implementation by another, versioning

abstract implementation, complete type: component with provided and required interfaces leave internal structure open

when does a component implement a type? exactly the same provided and required interfaces, but this would be too restrictive

One expects something like shown in Figure XXX

a component can provide more than its type and require less. This principle is called contra-variance.



Snowball 2007-03-16