Article ID (DOI)
Capture the Article ID (DOI) in a article-id element with a
pub-id-type value of doi
Every article must contain a unique DOI.
The value of this article-id is the DOI identifier only. The DOI identifier normally begins 10.1093 for OUP articles. It is not a full link to a DOI.
/article/front/article-meta/article-id
<article-id pub-id-type="doi">10.1093/annonc/mdv277</article-id>