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AtkNoOpObjectFactory — The AtkObjectFactory which creates an AtkNoOpObject.
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AtkObjectFactory — The base object class for a factory used to
create accessible objects for objects of a specific GType.
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AtkRegistry — An object used to store the GType of the
factories used to create an accessible object for an object of a
particular GType.
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Versioning macros — Variables and functions to check the ATK version