public AggregationScheme(Element root)
public AggregationScheme(int orgAggregation, int timeAggregation, int itemAggregation)
    public AggregationScheme(Element root)    {      orgAggregation = Integer.parseInt(root.getAttribute("org"));      timeAggregation = Integer.parseInt(root.getAttribute("time"));      itemAggregation = Integer.parseInt(root.getAttribute("item"));    }