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<?xml version="1.0" encoding="utf-8"?>
<pricelist>
  <oilprices>
    <price year="1998" value="956" />
    <price year="1999" value="4456" />
    <price year="2000" value="6456" />
    <price year="2001" value="2222" />
  </oilprices>
  <fuelprices>
    <price year="1998" e95="9745" e98="13745" />
    <price year="1999" e95="7745" e98="11745" />
    <price year="2000" e95="10745" e98="11745" />
    <price year="2001" e95="9745" e98="10745" />
</fuelprices>
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using System.Xml;

XmlTextWriter writer = new XmlTextWriter(this.Response.OutputStream, System.Text.Encoding.UTF8);
        //writer.WriteStartDocument();

        //chart¿ªÊ¼
        writer.WriteStartElement("chart");

        //series¿ªÊ¼