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Standards and norms are divided into chapters, which in turn may contain sub-chapters. These chapters (or sub-chapters) can reference other chapters (and sub-chapters), and in principle a reference is unidirectional (bidirectional references can be created). Similarly, chapters can reference chapters and sub-chapters of other standards. This makes it possible to derive one standard from another. Furthermore, this means that, for example, a test question that references such a standard chapter is automatically also related to the chapter of another standard.