Finding nodes of nodes in an XML file

How can I find nodes of element X just in element Y (not in whole of file) ?

<Y>
  <X>
      <Value>AirMass</Value>
      <Value>RailPressure</Value>
      <Value>BoostPressure</Value>    

    </X>
<Y>

<X>
    <Value>Speed</Value>
    <Value>Torque</Value>

</X>

What I have, returns the whole childs of X:

d = xmlread('myfile.xml')

v = d.getElementsByTagName('X')

for i=0:v.getLength-1

v.item(i).getTextContent

end

I just need to get: AirMass, RailPressure, BoostPressure.

Answer 1

[Robert Ungi]

Its a bit late, but whoever is looking for such a solution (I altered the smaple xml file above because it is invalid):

% <xml>
% <Y>
%   <X>
%       <Value>AirMass</Value>
%       <Value>RailPressure</Value>
%       <Value>BoostPressure</Value>    
%     </X>
% </Y>
% <X>
%     <Value>Speed</Value>
%     <Value>Torque</Value>
% </X>
% </xml>

import javax.xml.xpath.*

factory = XPathFactory.newInstance;
import javax.script.ScriptContext;
xpath = factory.newXPath;

fXML=xmlread('SampleXML.xml');

expression = xpath.compile('xml/Y/X/Value'); 
Value = expression.evaluate(fXML, XPathConstants.NODESET);

for i=0:Value.getLength-1
    disp(Value.item(i).getTextContent)
end

Adopted from The Wizzart.