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  1. or download this
    <Settings>
    <Channels>
    <Channel Name="R1" Voltage="100" Test="1"/>
    ...
    <Channel Name="L360" Voltage="120" Test="1"/>
    </Channels>
    </Settings>
    
  2. or download this
    if($root->findnodes('/Settings/Channels/Channel/Name="L1"')){  #<-Chan
    +nel name = "L1"
     my ($L1value) = $root->findnodes('/Settings/Channels/Channel/Name="L1
    +" @Voltage[.="400"]');
        $L1value->setValue(300);
    }