After the body and after the optional appendix, can be placed one or
more analytic index. This is obtained with a special heading element:
indexheading. This can be used only in conjunction with
printindex to define the type of index to include. The
example should be clear enough:
...
<indexheading>Index of functions</indexheading>
<printindex name="fn">
<indexheading>Concept index</indexheading>
<printindex name="cp">
...
</sgmltexi>
As can be seen from the example, printindex has an
attribute, name, that tells the type of index to include.
In fact, this way is generated the Texinfo command
@printindex.