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Design Patterns in C# by Steven John Metsker

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Chapter 5. Composite

A composite is a group of objects in which some objects may contain others, so that some objects represent groups and others represent individual items, or leaves. When you model a composite, two powerful concepts emerge. One important modeling idea is to design groups so that they can contain either individual items or other groups. (A common error is to define groups so that they can contain only leaves.) A second powerful concept is to define common behaviors for individual objects and for compositions. You can bring these ideas together by defining a common type for groups and items, and modeling groups as containing a collection of objects of this type. This fulfills the intent of the COMPOSITE pattern: COMPOSITE lets ...

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