Pre-coordination may also be achieved by means of subdivisions. In such a formation, the main heading normally represents the main focus of a subject while the subdivision or subdivisions bring out an aspect or aspects of the main subject. Examples

9.2 Reference

9.21 Headings with established subdivisions

9.22 Headings with free-floating subdivisions

9.23 Number of subdivisors

9.24 Order of subdivisions

See also:

9.0 Pre-coordination and synthesis