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The source of the information flowing to viewers may be controllers
associated with viewers, or the source may be methods defined on classes
specifically set up to embody domain knowledge. Such classes are
often called domain models because they model the problem-solving
domain. Note, however, that this use of the word model is different
from the use of the word in connection with the model–viewer–controller
paradigm—a domain model is not necessarily a subclass of the Model
class.