Specifies multiple secondary tables for an entity.

   Example 1: Multiple secondary tables assuming primary key columns are named the same in all tables.

   @Entity
   @Table(name="EMPLOYEE")
   @SecondaryTables({
       @SecondaryTable(name="EMP_DETAIL"),
       @SecondaryTable(name="EMP_HIST")
   })
   public class Employee { ... }


   Example 2: Multiple secondary tables with differently named primary key columns. 

   @Entity
   @Table(name="EMPLOYEE")
   @SecondaryTables({
       @SecondaryTable(name="EMP_DETAIL", 
           pkJoinColumns=@PrimaryKeyJoinColumn(name="EMPL_ID")),
       @SecondaryTable(name="EMP_HIST", 
           pkJoinColumns=@PrimaryKeyJoinColumn(name="EMPLOYEE_ID"))
   })
   public class Employee { ... }