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Hierarchical:
The hierarchical structuring must allow for inspecting many aggregate levels, even when parallel, in order to appraise the different levels and for drilling down.
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Cartesian:
Data are organised in multidimensional tables. This is the main feature that allows for scrutiny of data that vary in time, or by geographical location or otherwise. These many-entry (i.e. such that all crossings are meaningful) are called Hypercubes.
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Relational:
Data are sometimes organized according to the relational model, whenever only a small number of crossings are meaningful in a many-entry table.
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