Reading xml with boost

Hi!

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I am using property tree from boost to parse an xml-file.

It was working finu until I meet this:

<charging_functions>
    <function cs_type="fast">
        <breakpoint>
          <battery_level>0</battery_level>
          <charging_time>0.0</charging_time>
        </breakpoint>
        <breakpoint>
          <battery_level>13600</battery_level>
          <charging_time>0.31</charging_time>
        </breakpoint>
        <breakpoint>
          <battery_level>15200</battery_level>
          <charging_time>0.39</charging_time>
        </breakpoint>
        <breakpoint>
          <battery_level>16000</battery_level>
          <charging_time>0.51</charging_time>
        </breakpoint>
    </function>
</charging_functions>

I wanted to read each breakpoint and I did this:

boost::property_tree::ptree pt;
read_xml("test.xml", pt);




BOOST_FOREACH(boost::property_tree::ptree::value_type & v, pt.get_child("charging_functions.function")) {
	double t = v.second.get<double>("charging_time"); 
	double y = v.second.get<double>("battery_level");
}

I get the error: ERROR: No such node (charging_time)

However, if I remove "cs_type="fast"" from the <function cs_type="fast"> part, then it works fine.

Anybody know what I am doing wrong?

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Thanks!