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vocab-term-identifier Vocabulary/Taxonomy Term Identifier

A unique identifier within a specific vocabulary for the term to which this attribute is attached, such as (but not limited to) an item number, a URI, a DOI, etc.

Usage/Remarks

Four attributes are used in this Tag Set to identify a term 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 an IPC Code (“ipc”) or MESH heading (“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 ANSI/NISO Contributor Role Taxonomy (CRediT), 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>, <kwd>, <named-content>, <nested-kwd>, <restricted-by>, <role>, <see>, <see-also>, <subject>, <term>

Value Meaning
Text, numbers, or special characters An identifier of the term within a specific vocabulary, such as (but not limited to) an item number, a URI, DOI, etc.
Restriction @vocab-term-identifier is an optional attribute; there is no default.
Tagged Samples
Two vocabularies in one keyword group 
...
<kwd-group kwd-group-type="library-classifications">
 <compound-kwd vocab="LOC" 
   vocab-term="Diseases of the respiratory system"
   vocab-term-identifier="RC705-779">
  <compound-kwd-part>RC705-779</compound-kwd-part>
  <compound-kwd-part>Diseases of the respiratory system</compound-kwd-part>
 </compound-kwd>

 <compound-kwd vocab="Dewey Decimal" 
   vocab-term="Diseases of the respiratory system"
   vocab-term-identifier="616.3">
  <compound-kwd-part>616.3</compound-kwd-part>
  <compound-kwd-part>Diseases of the respiratory system</compound-kwd-part>
 </compound-kwd>
</kwd-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>
...