List<ChartSeries> _Items;			// list of chart series

		public ChartData(ReportDefn r, ReportLink p, XmlNode xNode) : base(r, p)
		{
			ChartSeries cs;
            _Items = new List<ChartSeries>();
			// Loop thru all the child nodes
			foreach(XmlNode xNodeLoop in xNode.ChildNodes)
			{
				if (xNodeLoop.NodeType != XmlNodeType.Element)
					continue;
				switch (xNodeLoop.Name)
				{
					case "ChartSeries":
						cs = new ChartSeries(r, this, xNodeLoop);
						break;
					default:	
						cs=null;		// don't know what this is
						// don't know this element - log it
						OwnerReport.rl.LogError(4, "Unknown ChartData element '" + xNodeLoop.Name + "' ignored.");
						break;
				}
				if (cs != null)
					_Items.Add(cs);
			}
			if (_Items.Count == 0)
				OwnerReport.rl.LogError(8, "For ChartData at least one ChartSeries is required.");
			else
                _Items.TrimExcess();
		}