Sandbox Sample Code which shall go into cli-config.php and index.php for EntityManager working with yaml is wrong

In http://www.doctrine-project.org/docs/orm/2.1/en/tutorials/getting-started-xml-edition.html
in Section: Obtaining the EntityManager
the Code:

//$driverImpl = new Doctrine\ORM\Mapping\Driver\XmlDriver(_DIR_."/config/mappings/xml");
$driverImpl = new Doctrine\ORM\Mapping\Driver\XmlDriver(_DIR_."/config/mappings/yml");
//$driverImpl = $config->newDefaultAnnotationDriver(_DIR_."/entities");

produces:

PHP Fatal error: Class 'Sandbox\Doctrine\ORM\Mapping\Driver\XmlDriver' not found in ..

Should be corrected to:
$driverImpl = new \Doctrine\ORM\Mapping\Driver\XmlDriver(_DIR_."/config/mappings/yml");

produces:

PHP Fatal error: Uncaught exception 'Doctrine\ORM\Mapping\MappingException' with message 'No mapping file found named 'Entities.User.dcm.xml' ..

Should be corrected to:
$driverImpl = new \Doctrine\ORM\Mapping\Driver\YamlDriver(_DIR_."/config/mappings/yml");

and finally, following the xml yaml Entities folder structure in the sandbox, should be corrected to:

$driverImpl = new \Doctrine\ORM\Mapping\Driver\YamlDriver(_DIR_."/yaml");

With this configuration I was able to create Entities from yaml through these commands:

1. doctrine orm:generate-entities ./
2. doctrine orm:schema-tool:create