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A Type Definition (typedef) is a control that consists of one or more primitive data types (string, cluster, array, ...) and even other type definitions, to form a new compound data type. Each instance of a type definition shares the same logical structure and is linked to the type definition, so that changes to the type definition are propagated to all of its instances. Type definitions do not share visual appearances (see Strict Type Definition).
Type definitions are created in the control editor and must be stored on disk.