Unique identifier of the term to which this attribute is attached within a specific vocabulary, such as (but not limited to) an item number, a URI, DOI, etc.
| Value | Meaning |
|---|---|
| Text, numbers, or special characters | A unique identifier of the term within a particular vocabulary, taxonomy, ontology, database, index, etc. This is typically a URI or DOI, but it may be any identifier, for example, an item number. |