code: public Column<Basic<T>> getOrCreateColumn()
     {
        Node node = childNode.getOrCreate("column");
        Column<Basic<T>> column = new ColumnImpl<Basic<T>>(this, "column", childNode, node);
        return column;
     }
docs: If not already created, a new <code>column</code> element with the given value will be created.
  Otherwise, the existing <code>column</code> element will be returned.
  @return  a new or existing instance of <code>Column<Basic<T>></code>