@Target(value=TYPE) @Retention(value=RUNTIME) public @interface DiscriminatorValue
 The DiscriminatorValue 
 annotation can only be specified on a concrete entity 
 class. 
 
 If the DiscriminatorValue annotation is not 
 specified and a discriminator column is used, a provider-specific 
 function will be used to generate a value representing the 
 entity type.  If the DiscriminatorType is 
 STRING, the discriminator value 
 default is the entity name. 
 
The inheritance strategy and the discriminator column are only specified in the root of an entity class hierarchy or subhierarchy in which a different inheritance strategy is applied. The discriminator value, if not defaulted, should be specified for each entity class in the hierarchy.
    Example:
    @Entity
    @Table(name="CUST")
    @Inheritance(strategy=SINGLE_TABLE)
    @DiscriminatorColumn(name="DISC", discriminatorType=STRING, length=20)
    @DiscriminatorValue("CUSTOMER")
    public class Customer { ... }
    @Entity
    @DiscriminatorValue("VCUSTOMER")
    public class ValuedCustomer extends Customer { ... }
 DiscriminatorColumnpublic abstract String value
 If the DiscriminatorValue annotation is not
 specified and a discriminator column is used, a
 provider-specific function will be used to generate a value
 representing the entity type.  If the DiscriminatorType is
 STRING, the discriminator value default is the
 entity name.
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