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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 this 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”.)
In general, Texinfo constructs the new indexing command by
concatenating the name of the index with `index'; thus, defining
an `xy' index leads to the automatic creation of an
@xyindex command.
Use the @printindex command to print the index, as you do with
the predefined indices. For example:
@node Author Index
@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 by default instead of a roman font.
You should define new indices before the end-of-header line of a
Texinfo file, and (of course) before any @synindex or
@syncodeindex commands (see Texinfo File Header).