This attribute can be used to name the thesaurus, ontology, or organization that established a particular group of keywords, for example, “MESH”, “ISO-463”, “IEEE”, “author-generated”, “ICD9-codes”, etc.
| Value | Meaning |
|---|---|
| Text, numbers, or special characters | The source of keywords. This may be an organization (such as “IEEE”) or the name of a thesaurus, subject index, or ontology (such as “MESH”). |
| Restriction: This attribute may be specified if the element is used. | |