The `DomainModel` is a class in the Python Orange library's widget utilities module (`Orange.widgets.utils.itemmodels`). It is used to create a model that represents a domain in a widget, such as a list of items or options that the user can select from. The `DomainModel` provides functionalities to manipulate and access the items within the domain, including adding, removing, or updating items. It is commonly used in Orange widgets to populate dropdown menus or list views with selectable options related to the widget's functionality.
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