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Since the process combination of components is very complicated, and therefore, the combination process of these components are often "externalized" to a called an object builder, the builder returned to the client is an already built complete product object is completed, and the user does not need concern the object contains properties and their assembly methods, this is the mode of motivation builder mode.
Model Builder (Builder Pattern): represents the construct and its separation of a complex object, such that the same build process can create different representations.