Common usage:
  neposync -nf [OPTIONS..] [DIRECTORY]
  neposync -fn [OPTIONS..] [DIRECTORY]
Actions (nepomuk):
  -nf, --nepomuk-to-files    Read tags/ratings from Nepomuk and store them in files metadata
  -fn, --files-to-nepomuk    Read tags/ratings from files metadata and store them in Nepomuk
  -dn, --display-nepomuk     Display all Nepomuk tags/ratings
  -cn, --clear-nepomuk       Clear all Nepomuk tags/ratings
Actions (amarok):
  -af, --amarok-to-files     Read ratings from Amarok collection and store them in files metadata
  -fa, --files-to-amarok     Read ratings from files metadata and store them in Amarok collection
  -da, --display-amarok      Display all Amarok ratings
  -qa, --query-amarok QUERY  Execute Mysql query QUERY in Amarok collection
Options:
  -r   --recursive           Recurse into sub-directories
  -f   --force               Copy tags/ratings even if empty on source side
  -V   --verbose             Display all nepomuk output (depending on KDebug settings)
  -h   --help                Display this usage information
       --version             Display version and copyright information
DIRECTORY is optional, if absent the current directory is synchronized

Remarks: neposync uses IPTC 'keyword' metadata to read/store tags in image files (as Digikam)
         neposync uses XMP 'Rating' metadata to read/store ratings in image files (as Digikam)
         neposync uses ID3v2 'Popularimeter/POPM' metadata to read/store ratings in MP3 files