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