Example resolver

gistfile1.aw

<?php
if ($object->xpdo) {
    $modx =& $object->xpdo;
    switch ($options[xPDOTransport::PACKAGE_ACTION]) {
        case xPDOTransport::ACTION_INSTALL:
            break;
        case xPDOTransport::ACTION_UPGRADE:
            break;
        case xPDOTransport::ACTION_UNINSTALL:
            break;
    }
}
return true;