The structure if a fully developed classification can be technically described in the following way

(2) Each field may be divided into a series of facets... | (3) Each facet may be structured into a hierarchy, subdivided stage by stage into a series of characteristics... | (4) Rules may be provided for combining (coordinating) terms... | (5) Each field, facet and term may be coded to fix its position in the whole system... | (6)An alphabetical index to the terms, facets and fields may be provided, showing the code of each | p. 14.