org: Generating an index

 
 13.1.8 Generating an index
 --------------------------
 
 Org mode can generate an index across the files of a publishing project.
 
 ‘:makeindex’       When non-‘nil’, generate in index in the file
                    ‘theindex.org’ and publish it as ‘theindex.html’.
 
    The file will be created when first publishing a project with the
 ‘:makeindex’ set.  The file only contains a statement ‘#+INCLUDE:
 "theindex.inc"’.  You can then build around this include statement by
 adding a title, style information, etc.