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vocab-identifier Vocabulary/Taxonomy Identifier

Unique identifier of the controlled vocabulary, taxonomy, ontology, database, thesaurus, index, etc. that is the source of the content in the element, for example, the controlled vocabulary for a group of terms such as a keywords or subjects. The content is typically (but is not limited to) a URI or DOI.

Usage/Remarks

Four attributes are used in this Tag Set to identify terms from a controlled or an uncontrolled vocabulary:
vocab
Name of the controlled or uncontrolled vocabulary, taxonomy, ontology, index, database, or similar that is the source of the term. For example, for a subject term, a value might be the IPC Codes (“ipc”) or MESH headings (“mesh”). For an uncontrolled term, the value might be an area of study such as “medical-devices” or merely the word “uncontrolled”.
vocab-identifier
Unique identifier of the vocabulary, such as (but not limited to) a URI or DOI. For example, for Dublin Core (DCC), the identifier may be http://dublincore.org/documents/2012/06/14/dces/. For the NISO CRediT, Contributor Roles Taxonomy, the identifier may be http://credit.niso.org/.
vocab-term
The content of the element is the display version of the vocabulary or taxonomic term. The @vocab-term attribute holds the canonical version of the same term, as it appears in the vocabulary. For example, if the attribute value is “digitized-vor”, the element might contain the display text “Digitized Version of Record”.
vocab-term-identifier
Unique identifier of the term within a specific vocabulary, such as (but not limited to) an item number, a URI, DOI, etc.
OPTIONAL on many elements; click for list and usage

<article-version>, <compound-kwd>, <compound-subject>, <custom-meta>, <extended-by>, <index-term>, <inline-media>, <institution-id>, <kwd>, <kwd-group>, <named-content>, <nested-kwd>, <resource-id>, <restricted-by>, <role>, <see-also>, <subj-group>, <subject>, <term>

Value Meaning
Text, numbers, or special characters The identifier of the controlled vocabulary, taxonomy, ontology, database, thesaurus, index, etc. that is the source of the content in the element, typically (but not limited to) a URI or DOI.
Restriction @vocab-identifier is an optional attribute; there is no default.
Tagged Samples
Vocabulary is a CRediT taxonomy term. 
...
<contrib-group>
 <contrib>
  <string-name><given-names>Barbara</given-names> <surname>Johnston</surname></string-name>
  <role vocab="CRediT" 
    vocab-identifier="http://credit.niso.org//"
    vocab-term="Conceptualization"
    vocab-term-identifier=
    "http://credit.niso.org/contributor-roles/conceptualization/"
    degree-contribution="lead">study designer</role>
 </contrib>
 <contrib>
  <string-name><given-names>Brooke</given-names> <surname>Jackson</surname></string-name>
  <role vocab="CRediT" 
    vocab-identifier="http://credit.niso.org/"
    vocab-term="Writing &#8212; original draft"
    vocab-term-identifier=
    "http://credit.niso.org/contributor-roles/writing-original-draft/"
    degree-contribution="lead">writer</role>
 </contrib>
</contrib-group>
...
Special characters in CRediT attribute values need to be given as Unicode character references. In narrative text, Unicode character references, general entities, or characters may be used. 
...
<contrib-group>
 <contrib>
  <string-name><given-names>Anne</given-names> <surname>Berns</surname></string-name>
  <role vocab="CRediT" 
    vocab-identifier="http://credit.niso.org/"
    vocab-term="Writing &#8212; original draft"
    vocab-term-identifier=
    "http://credit.niso.org/contributor-roles/writing-original-draft/"
    degree-contribution="lead">Article Author &ndash; Original Draft</role>
 </contrib>
</contrib-group>
...
Keywords with vocabulary and vocabulary-term identifiers 
...
<kwd-group kwd-group-type="physh" xml:lang="en"
  vocab="PhySH" vocab-identifier="https://physh.org/">
 <nested-kwd>
  <kwd content-type="facet" 
    vocab="PhySH" vocab-identifier="https://physh.org/" 
    vocab-term-identifier="https://physh.aps.org/browse?facetIds=Research%2520Areas"
   >Research Areas</kwd>
  <nested-kwd>
   <kwd content-type="concept" 
     vocab="PhySH" vocab-identifier="https://physh.org/"
     vocab-term-identifier="https://doi.org/10.29172/ba7ccb8ed7eb4e6f9c1eb622f5b4e242"
    >Atomic &amp; molecular processes in external fields</kwd>
   <nested-kwd>
    <kwd content-type="concept" 
      vocab="PhySH" vocab-identifier="https://physh.org/"
      vocab-term-identifier="https://doi.org/10.29172/da893accf204480b8a7e386479c50687"
     >Coherent control</kwd>
   </nested-kwd>
  </nested-kwd>
 </nested-kwd>
 <nested-kwd>
  <kwd content-type="facet" 
    vocab="PhySH" vocab-identifier="https://physh.org/"
    vocab-term-identifier="https://physh.aps.org/browse?facetIds=Physical%2520Systems"
   >Physical Systems</kwd>
  <nested-kwd>
   <kwd content-type="concept" 
     vocab="PhySH" vocab-identifier="https://physh.org/"
     vocab-term-identifier="https://doi.org/10.29172/bd252d88a60848979416daf84dee7f6b"
    >Atomic Systems</kwd>
   <nested-kwd>
    <kwd content-type="concept" 
      vocab="PhySH" vocab-identifier="https://physh.org/"
      vocab-term-identifier="https://doi.org/10.29172/42e66168abfd4328aa9df6fc3a077f75"
     >Molecules</kwd>
   </nested-kwd>
  </nested-kwd>
 </nested-kwd>
</kwd-group>
...