If a pre-coordinated co-extensive heading does not exist, a work on a single topic with multiple elements may be assigned two or more headings to bring out the elements or aspects. In such a case, each of the headings assigned is broader than the subject treated in the work, and the specific subject of the work is represented by the intersection of these headings. Specificity is achieved only through post-coordination (i.e., combining the elements during the process of searching). Examples

26.52 Reference

See also:

26.5 Works on single topics with multiple elements or aspects