Akonadi for KDE's PIM
http://userbase.kde.org/Akonadi
Why data from Akonadi is indexed in Nepomuk
http://cmollekopf.wordpress.com/2013/02/13/kontact-nepomuk-integration-why-data-from-akonadi-is-indexed-in-nepomuk/
http://userbase.kde.org/Akonadi
http://cmollekopf.wordpress.com/2013/02/13/kontact-nepomuk-integration-why-data-from-akonadi-is-indexed-in-nepomuk/