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== Participants ==
The classes and/or objects participating in this pattern are:<br />
<ul>
<li>'''Abstraction'''</li>
<ul>
<li>defines the abstraction's interface</li>
<li>maintains a reference to an object of type Implementor</li>
</ul>
<li>'''Refined Abstraction</li>
<ul>
<li>extends the interface defined by Abstraction.</li>
</ul>
<li>'''Implementor'''</li>
<ul>
<li>defines the interface for implementation classes. This interface does not have to correspond exactly to Abstraction's interface; in fact the two interfaces can be quite different. The Implementation interface provides only primitive operations, and Abstraction defines high-level operations based on these primitives.
</ul>
<li>'''Concrete Implementor'''</li>
<ul>
<li>implements the Implementor interface and defines its concrete implementation.</li>
</ul>
== Collaborations ==
