cmdline      {Information about the available subcommands}
doctools_fmt {Format specification:  doctools (Manpages)}
doctoc_fmt   {Format specification:  doctoc   (Table of Contents)}
docidx_fmt   {Format specification:  docidx   (Indices)}
doctools_api {API Formatting engine: doctools (Manpages)}
doctoc_api   {API Formatting engine: doctoc   (Table of Contents)}
docidx_api   {API Formatting engine: docidx   (Indices)}
