<issue-id> Issue Identifier (for citations)
Name or identifier of an entire journal issue (for example, a DOI).
This element is used (rarely) only within citations and other referencing elements. The element holds an external identifier, typically assigned by a publisher. The contents of this element should not be confused with the @id attribute, which holds an internal document identifier that can be used by software to preform a simple link.
Models and Context
May be contained in
Text, numbers, or special characters
<!ELEMENT issue-id (#PCDATA) >