Using xPDO to reverse engineer existing database

<?php
$mtime= microtime();
$mtime= explode(" ", $mtime);
$mtime= $mtime[1] + $mtime[0];
$tstart= $mtime;

//Customize this line based on the location of your script
include_once (strtr(realpath(dirname(__FILE__)) . '/../../xpdo/xpdo.class.php', '\\', '/'));

$xpdo= new xPDO('mysql:host=localhost;dbname=modx','username','password','modx_');

// Set the package name and root path of that package
$xpdo->setPackage('modx', XPDO_CORE_PATH . '../model/');

$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/schema/modx.mysql.schema.xml', 'modx', 'xPDOObject', 'modx_');

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

$mtime= microtime();
$mtime= explode(" ", $mtime);
$mtime= $mtime[1] + $mtime[0];
$tend= $mtime;
$totalTime= ($tend - $tstart);
$totalTime= sprintf("%2.4f s", $totalTime);

echo "\nExecution time: {$totalTime}\n";

exit ();
?>

	<object class="AdaptiveAccounts" table="adaptive_accounts" extends="xPDOSimpleObject">
		<field key="first_name" dbtype="varchar" precision="75" phptype="string" null="true" />
		<field key="last_name" dbtype="varchar" precision="75" phptype="string" null="true" />
		<field key="verify_sign" dbtype="varchar" precision="255" phptype="string" null="true" />
		<field key="account_key" dbtype="varchar" precision="100" phptype="string" null="true" />
		<field key="confirmation_code" dbtype="varchar" precision="100" phptype="string" null="true" />
		<field key="charset" dbtype="varchar"0 phptype="string" null="true" />
	</object>