[php]
$classes = $xem->getClassMetadataInfoFactory()->getAllMetadata();
$generator = new \Doctrine\OXM\MongoDB\Tools\XmlEntityGenerator();
$generator->setGenerateAnnotations(true);
$generator->setGenerateStubMethods(true);
$generator->setRegenerateXmlEntityIfExists(false);
$generator->setUpdateXmlEntityIfExists(true);
$generator->generate($classes, '/path/to/generate/xml-entitys');