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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 terms in a group of terms such as a keywords group or subject group. The content is typically (but not limited to) a URI or DOI.

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 IPC Code (“ipc”) or UNS Code (“uns”). For an uncontrolled term, the value might be an area of study such as “structural engineering” 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 might be “http://dublincore.org/documents/2012/06/14/dces/”.
vocab-term
The content of the element is the free prose 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 was “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

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

Value Meaning
Text, numbers, or special characters A unique identifier of the source of the term named in the element content. This is typically a URI or DOI, but it may be any identifier.
Restriction This attribute may be specified if the element is used.
Tagged Sample

Inspec vocabulary (for keyword group)

...
<kwd-group id="KG1" originator="ASME" vocab="Inspec"
  vocab-identifier="http://www.theiet.org/resources/inspec/about/records/ithesaurus.cfm"
  xml:lang="en">
 <compound-kwd id="KG1.1">
  <compound-kwd-part content-type="code">A7865P</compound-kwd-part>
  <compound-kwd-part content-type="text">Optical properties of other 
   inorganic semiconductors and insulators (thin films/low dimensional 
   structures)</compound-kwd-part>
 </compound-kwd>

 <compound-kwd id="KG1.2">
  <compound-kwd-part content-type="code">A7865T</compound-kwd-part>
  <compound-kwd-part content-type="text">Optical properties of organic
   compounds and polymers (thin films/low dimensional structures)</compound-kwd-part>
 </compound-kwd>
</kwd-group>
...