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
10. thesauri

Anotations

Scope note:

Controlled vocabularies in the form of a thesaurus, that are limited in the range of topics covered, but fit within the domain of a larger, broader, or more generic controlled vocabulary. A microthesaurus typically contains highly specialized terms that map to the hierarchical structure of the broader vocabulary at a high level node.