private function setInstallModelFiles($installModelFiles)
    {
        $this->installModelFiles = array();
        $installModelFiles = is_array($installModelFiles) ? $installModelFiles : array($installModelFiles);
		foreach ($installModelFiles as $row) {
			if (is_string($row)) {
				$rdfpath = $row;
			} elseif (is_array($row) && isset($row['file'])) {
				$rdfpath = $row['file'];
			} else {
				throw new common_ext_InstallationException('Error in definition of model to add into the ontology for '.$this->extension->getId(), 'INSTALL');
			}
    		$this->installModelFiles[] = $rdfpath;
		}
    }