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 Defining New Indices
 ====================
 
   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 ( Texinfo File Header).
 

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