The @vocab-term-identifier attribute value points to a unique identifier of the term within a specific vocabulary, such as (but not limited to) an item number, a URI, DOI, etc.
For example, for the term “contributor”
for Dublin Core:
“http://dublincore.org/usage/terms/history/#contributor-006”
<publisher> <publisher-name vocab="dcmi" vocab-identifier="http://dublincore.org/documents/2012/06/14/dcmi-terms/" vocab-term="publisher" vocab-term-identifier="http://purl.org/dc/elements/1.1/publisher" <publisher-name>British Medical Journal</publisher-name> </publisher>