index-type Type of Index

Names the specific indexes in which an index term (<index-term>) should be used, for example, “author”, “subject”, “chemical”.
OPTIONAL on element: <index>
Value Meaning
A word or phrase The name of the index, for example, “species”, “chemical”, “subject”, etc.
Restriction @index-type is an optional attribute; there is no default.
OPTIONAL on element: <index-term>
Value Meaning
One or more words A word naming the index, or a series of words each representing a specific index.
Restriction @index-type is an optional attribute; there is no default.
Tagged Samples
As part of an index term positioned in the narrative text (used to create an index)
...
<p>However, the First Amendment does not bar the 
 issuance or execution of a warrant to search a newsroom
 <index-term index-type="subject"><term>Newspapers</term>
 <see-also>Speech and press</see-also></index-term> to 
 obtain photographs of demonstrators ...</p>
...
As a descriptor for an existing structural index
...
<index-group>
  <index index-type="table-of-cases">
    ...
  </index>
  <index index-type="author-names">
    ...
  </index>
  <index index-type="keyword">
    ...
  </index>
</index-group>
...