code: public PrimaryKeyJoinColumn<SecondaryTable<T>> getOrCreatePrimaryKeyJoinColumn()
     {
        List<Node> nodeList = childNode.get("primary-key-join-column");
        if (nodeList != null &&  nodeList.size() > 0)
        {
           return new PrimaryKeyJoinColumnImpl<SecondaryTable<T>>(this, "primary-key-join-column", childNode, nodeList.get(0));
        }
        return createPrimaryKeyJoinColumn();
     }
docs: If not already created, a new <code>primary-key-join-column</code> element will be created and returned.
  Otherwise, the first existing <code>primary-key-join-column</code> element will be returned.
  @return the instance defined for the element <code>primary-key-join-column</code>