Warning: XSLTProcessor::transformToXml() [xsltprocessor.transformtoxml]: I/O warning : failed to load external entity "file:////srv/scielo/www/bases/xml/rus/v15n5/2218-3620-rus-15-05-550.xml" in /srv-new/scielo/www/htdocs/class.XSLTransformerPHP5.php on line 36 La pena, ¿finalidad retributiva o utilitarista?