protected function init()
{
parent::init();
$this->name = Piwik::translate('Contents_ContentPiece');
$this->dimension = null;
// TODO $this->documentation = Piwik::translate('ContentsDocumentation');
$this->dimension = new ContentPiece();
$this->order = 36;
$this->actionToLoadSubTables = 'getContentPieces';
$this->metrics = array('nb_impressions', 'nb_interactions');
$this->processedMetrics = array(new InteractionRate());
}