自动生成Doctrine实体; 自定义解析

I'm using Doctrine 2.2.1 to reverse engineer a DB (YAML mappings), and subsequently generate the entity files. Right now, I have it setup to use the Entity namespace. The database names themselves are converted to camel case.

So... user_acl becomes:

<?php
namespace Entity;

// ...

class UserAcl {}

Is there a way to have user_acl generate a class with the following structure:

<?php
namespace Entity\User;

class Acl {}

So my question is... Can Doctrine use underscores to determine the namespace in lieu of using them to generate a camel caps-style class name?