Warning: XSLTProcessor::transformToXml() [xsltprocessor.transformtoxml]: I/O warning : failed to load external entity "file:////srv/scielo/www/bases/xml/rc/v20n96/1990-8644-rc-20-96-229.xml" in /srv-new/scielo/www/htdocs/class.XSLTransformerPHP5.php on line 36 Preparation of students based on a management model in the Canton of Quevedo