Is this identifier as given by the author or supplied by a linking service?
This is an APA-specific (non-NLM) attribute.
| Value | Meaning |
|---|---|
| author-published | The <pub-id> was explicitly published as part of a citation by the author of the article. |
| matched | The <pub-id> was obtained by matching the citation against a database such as PubMed, CrossRef, or PsycINFO. |
| Restriction: This attribute may be specified if the element is used. | |