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indexentry — An entry in an index
indexentry ::= (primaryie, (seeie|seealsoie)*, (secondaryie, (seeie|seealsoie|tertiaryie)*)*)
               An IndexEntry wraps all of the index terms associated with
               a particular primary index term.  This includes an arbitrary list of
               secondary and 
               tertiary elements as well as 
               See and
               SeeAlso elements.
               
            
Formatted as a displayed block. A rendered index usually places secondary items under primary items and tertiary items under secondary.
The following elements occur in indexentry:
                  primaryie, secondaryie, seealsoie, seeie, tertiaryie.