If you cannot find a terms in the chosen thesaurus to describe the material, contact the metadata librarian. Terms can be created locally, but they must be recorded in the local database, and may be used as submissions to the relevant thesaurus through the Program for Cooperative Cataloging (PCC).
Each schema will have different options for describing types of subjects. These are some of the most common:
Additional types of subjects may be recommended for certain types of objects. For example, cartographic materials may also require descriptions of their subject using hierarchical geographic information, coordinates, scale, or projection. If you think your needs may be met by using a different type of subject, or if you know what controlled vocabulary you want to use and are unsure of where it should be placed, contact the metadata librarian.