In addition to the predefined indices, you may use the
@defindex and @defcodeindex commands to define new
indices. These commands create new indexing @-commands with which
you mark index entries. The @defindex command is used like
this:
@defindex name
The name of an index should be a two letter word, such as au.
For example:
@defindex au
This defines a new index, called the au index. At the same
time, it creates a new indexing command, @auindex, that you
can use to make index entries. Use the new indexing command just as
you would use a predefined indexing command.
For example, here is a section heading followed by a concept index
entry and two au index entries.
@section Cognitive Semantics
@cindex kinesthetic image schemas
@auindex Johnson, Mark
@auindex Lakoff, George
(Evidently, au serves here as an abbreviation for "author".)
Texinfo constructs the new indexing command by concatenating the name
of the index with index; thus, defining an au index
leads to the automatic creation of an @auindex command.
Use the @printindex command to print the index, as you do with
the predefined indices. For example:
@node Author Index, Subject Index, , Top
@unnumbered Author Index
@printindex au
The @defcodeindex is like the @defindex command, except
that, in the printed output, it prints entries in an @code font
instead of a roman font. Thus, it parallels the @findex command
rather than the @cindex command.
You should define new indices within or right after the end-of-header
line of a Texinfo file, before any @synindex or
@syncodeindex commands (see Texinfo File Header).