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Here's an idea for another way to frame this concept:

A model object is any type of JavaScript object that represents the data in your application. Infusion doesn't impose any specific contracts on what types of objects can be a model, but all model objects must be successfully copyable using the fluid.copy() function. Ordinarily, this will probably a JSON-compatible object, but the framework doesn't limit you to this.

Java developers may recognize the similarity to the concept of POJOs (Plain Old JavaScript Objects).

fluid.copy() uses jQuery's .extend() method to make a deep copy of any object.