I am trying to class type inheritance with Doctrine.  Eventually, I will be defining things using XML, but all the examples are done using doctags.  I found the following and it seems to work. <?php use Doctrine\ORM\Mapping as ORM; /**  * Inventory entity  *  * @ORM\Entity(repositoryClass="Inventory")  * @ORM\Table(name="inventory")  * @ORM\InheritanceType("JOINED")  * @ORM\DiscriminatorColumn(name="discriminator_column", type="string")  * @ORM\DiscriminatorMap({"inventory" = "AbstractIt