}
// Could also be the ISBN number, prefered for published books, or a UUID.
$hash = sha1(sprintf('%s:%s', $this->wallabagUrl, implode(',', $entryIds)));
$book->setIdentifier(sprintf('urn:wallabag:%s', $hash), EPub::IDENTIFIER_URI);
}
// Could also be the ISBN number, prefered for published books, or a UUID.
$hash = sha1(sprintf('%s:%s', $this->wallabagUrl, implode(',', $entryIds)));
$book->setIdentifier(sprintf('urn:wallabag:%s', $hash), EPub::IDENTIFIER_URI);