Warning: XSLTProcessor::transformToXml() [xsltprocessor.transformtoxml]: I/O warning : failed to load external entity "file:////srv/scielo/www/bases/xml/accion/v19/1812-5808-accion-19-e06.xml" in /srv-new/scielo/www/htdocs/class.XSLTransformerPHP5.php on line 36 Desafios contemporâneos da educação física no contexto educativo actual