@Target(value=TYPE) @Retention(value=RUNTIME) public @interface DiscriminatorColumn
SINGLE_TABLE and 
 JOINED Inheritance mapping strategies.
 
 The 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
 If the DiscriminatorColumn annotation is missing, 
 and a discriminator column is required, the name of the 
 discriminator column defaults to "DTYPE" and the discriminator 
 type to DiscriminatorType.STRING.
 
     Example:
     @Entity
     @Table(name="CUST")
     @Inheritance(strategy=SINGLE_TABLE)
     @DiscriminatorColumn(name="DISC", discriminatorType=STRING, length=20)
     public class Customer { ... }
     @Entity
     public class ValuedCustomer extends Customer { ... }
 DiscriminatorValue| Modifier and Type | Optional Element and Description | 
|---|---|
| String | columnDefinition(Optional) The SQL fragment that is used when generating the DDL 
 for the discriminator column. | 
| DiscriminatorType | discriminatorType(Optional) The type of object/column to use as a class discriminator. | 
| int | length(Optional) The column length for String-based discriminator types. | 
| String | name(Optional) The name of column to be used for the discriminator. | 
public abstract String name
public abstract DiscriminatorType discriminatorType
DiscriminatorType.STRING.public abstract String columnDefinition
Defaults to the provider-generated SQL to create a column of the specified discriminator type.
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