Names the type of publication identifier, or the organization or system that defined the identifier.
This attribute is used in three contexts:
As part of the article metadata (for example, on the <article-id> element, which holds an identifier for the entire article),
Inside a bibliographic citation (for example, on the <pub-id> element, which identifies a publication cited in a bibliographic reference list), and
On an object identifier (for example, on the <object-id> element, which can act as an identifier for any number of different elements).
| Value | Meaning |
|---|---|
| Text, numbers, or special characters | The type of identifier doior name or type of organization that created the identifier, such as aggregator |