/**
* @param $f
* @param $translatableProperties
* @return tao_helpers_translation_POFile
* @throws tao_helpers_translation_TranslationException
*/
protected function extractPoFileFromRDF($f, $translatableProperties)
{
$modelExtractor = new tao_helpers_translation_POExtractor(array($f));
$modelExtractor->setTranslatableProperties($translatableProperties);
$modelExtractor->extract();
$translationFile = new tao_helpers_translation_POFile();
$translationFile->setSourceLanguage(tao_helpers_translation_Utils::getDefaultLanguage());
$translationFile->setTargetLanguage($this->options['language']);
$translationFile->addTranslationUnits($modelExtractor->getTranslationUnits());
$translationFile->setExtensionId($this->options['extension']);
$this->preparePOFile($translationFile);
return $translationFile;
}