itermset
itermset — A set of index terms in the meta-information of a document.
Description
When indexterms use the zone attribute to point to index ranges, it
      may be handy to hoist them out of the flow and put them in the document
      meta-information.
The itermset element, which occurs in the
      DocBook containers for meta-information, is one place to put them. An
      itermset is simply a wrapper around a group of
      indexterms.
Processing expectations
Suppressed.
Although more than one itermset may appear in
        the meta-information for a document, neither a relationship nor a
        specific facility for constructing a relationship is defined.
Children
The following elements occur in itermset: indexterm (db.indexterm.singular).




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