code: public JoinTable<ManyToOne<T>> getOrCreateJoinTable()
     {
        Node node = childNode.getOrCreate("join-table");
        JoinTable<ManyToOne<T>> joinTable = new JoinTableImpl<ManyToOne<T>>(this, "join-table", childNode, node);
        return joinTable;
     }
docs: If not already created, a new <code>join-table</code> element with the given value will be created.
  Otherwise, the existing <code>join-table</code> element will be returned.
  @return  a new or existing instance of <code>JoinTable<ManyToOne<T>></code>