public void getNodeMapItems(double z, double x, double y, NamedNodeMap nodeMap, String first, String second){
		try {
			z = Float.parseFloat(nodeMap.getNamedItem(MASS)
					.getNodeValue());
		} catch (Exception e) {}
		try {
			x = Double.parseDouble(nodeMap.getNamedItem(first)
					.getNodeValue());
		} catch (Exception e) {}
		try {
			y = Double.parseDouble(nodeMap.getNamedItem(second)
					.getNodeValue());
		} catch (Exception e) {}
	}