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Value holders and aspect adapters help to make GUI
widgets reusable, because value holders and aspect adapters make it
possible for widget methods to access uniformly the data that they need. Each
widget that conforms to the value-holder–aspect-adapter convention
looks in the model slot for a value holder or aspect adapter, and
accesses the information in the value holder or aspect adapter with the
value getter and value: setter.
Accordingly, all you need to tell such a widget is the name of the accessor that produces a value holder or aspect adapter from the application model.