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 or alphanumeric codes, press-marks or shelf-mark, or other sets of symbols identifying a particular item or items in a library collection, expressing the subject contents of the item and its shelving location.