public function getAllVersions()
    {
        $versions = array();

        foreach ($this->getEntities() as $entity) {
            if ($entity->getVersion()) {
                $versions[$entity->getVersion()] = $entity->getVersion();
            } else {
                $versions['0.0'] = _t('DocumentationManifest.MASTER', 'Master');
            }
        }

        asort($versions);

        return $versions;
    }