<?xml version="1.0" encoding="UTF-8"?>
<protocal>
  <name>P1PPP</name>
  <version>1</version>
  <functions>
    <function name="readRTData">
      <funcID>1</funcID>
      <start>1</start>
      <end>20</end>
    </function>
    <function name="readVerifyData">
      <funcID>2</funcID>
      <start>21</start>
      <end>40</end>
    </function>
    <function name="writeCtrlData">
      <funcID>3</funcID>
      <start>41</start>
      <end>60</end>
    </function>
  </functions>
  <registers>
    <register name="uvol_fr ">
      <addr>0</addr>
      <type>0</type>
      <property>1</property>
    </register>
    <register name="uvol_total_p">
      <addr>2</addr>
      <type>0</type>
      <property>1</property>
    </register>
  </registers>
</protocal>

XmlNode xmllist = XMLHelper.GetXmlNodeByXpath(filename, "/protocal/functions");
            foreach (XmlNode n in xmllist.ChildNodes)
            {
                Debug.WriteLine(n.Attributes["name"]);
                foreach (XmlNode x in n.ChildNodes)
                    Debug.WriteLine(x.Name + "  " + x.InnerText);
            }