$xpdo= new xPDO('mysql:host=localhost;dbname=jpdo', 'root', '', 'modx_');
$xpdo->setPackage('modx096');
//$xpdo->setDebug(true);

$manager= $xpdo->getManager();
$generator= $manager->getGenerator();

//Use this to create a schema from an existing database
$xml= $generator->writeSchema(XPDO_CORE_PATH . '_model/modx096.mysql.schema.xml', 'modx', 'xPDOObject', 'modx_', true);

//Use this to generate classes and maps from a schema
// NOTE: by default, only maps are overwritten; delete class files if you want to regenerate classes
$generator->parseSchema(XPDO_CORE_PATH . '_model/modx096.mysql.schema.xml');