assigned to each heading in alphabetical order.

Hierarchical

: Subjects are divided hierarchically, from most general to most specific.

Faceted/analytico-synthetic

: Subjects are divided into mutually exclusive orthogonal facets.

There are few completely enumerative systems or faceted systems; most systems are a blend but favouring one type or the other. The most common classification systems, LCC and DDC, are essentially enumerative, though with some hierarchical and faceted elements (more so for

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