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. information artifacts
7. [information artifacts by function]
8. identifying artifacts
9. identification numbers and codes
10. identification numbers

Additional parents:

1. top of the aat hierarchies
2. Objects Facet
3. Visual and Verbal Communication
4. Information Forms
5. information forms
6. document genres
7. documents by function
8. identifying markings and symbols
9. marks
10. marks by function

Anotations

Scope note:

Numeric, alphanumeric, or other identifying codes assigned to an art object, book, or other item by the creator or producer of the work. The number is usually inscribed or otherwise marked on the work. For numbers assigned at the time of accession by an owner or repository, prefer "accession numbers."