Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Visual and Verbal Communication (hierarchy name)
4. Information Forms (hierarchy name)
5. information forms (objects)
6. document genres
7. [documents by function]
8. reference sources
9. controlled vocabularies

Anotations

Scope note:

Access points to a bibliographical record based upon subject terminology, usually from a standardized or controlled vocabulary. Subject headings are words or phrases; pre-coordination of terminology is a characteristic of subject headings, meaning that they combine several unique concepts together in a string (e.g., "Medieval bronze vessels" combines a period, material, and work type in one heading).