register a namespace in xPath filter

I have realized a really stupid xPath filter in MatLab:

% Construct the DOM.
docNode = xmlread('C:\Users\MATLAB\test.gpx');

% get the xpath mechanism into the workspace
import javax.xml.xpath.*
factory = XPathFactory.newInstance;
xpath = factory.newXPath;

% compile and evaluate the XPath Expression
expression = xpath.compile('gpx/AddressBook/Entry/PhoneNumber');
phoneNumberNode = expression.evaluate(docNode, XPathConstants.NODE);
phoneNumber = phoneNumberNode.getTextContent

With this XML (specifically a .gpx file) it works:

<?xml version='1.0' encoding='ISO-8859-1' standalone='yes' ?>
<gpx version='1.1' creator='TTTracklog V.1.13'>
    
       <Entry>
          <Name>Friendly J. Mathworker</Name>
          <PhoneNumber>[phone]</PhoneNumber>
          <Address hasZip="no" type="work">3 Apple Hill Dr, Natick MA</Address>
       </Entry>
    
</gpx>

but as soon add a namespace to this file I get in trouble. For example, this xml doesn't works:

<?xml version='1.0' encoding='ISO-8859-1' standalone='yes'?>
<gpx version='1.1' creator='TTTracklog V.1.13' xmlns='http://www.topografix.com/GPX/1/1' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:schemaLocation='http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd'>


     <Entry>
        <Name>Friendly J. Mathworker</Name>
        <PhoneNumber>[phone]</PhoneNumber>
        <Address hasZip="no" type="work">3 Apple Hill Dr, Natick MA</Address>
     </Entry>
  

</gpx>

My filter broke up, with second XML file, saying that I'm attempting to reference field of non-structure array. How can I register the default namespace?

[sst]

Hello marianoc84, I am also looking for a solution to a similar problem. Do let me know if you find anything.

[Jarrod Rivituso]

I'm not sure how do do this without really getting into the Java files. :)

There's a tool I put together which allows you to extract data via XPath with namespace support.

XMLNode

You may find it useful!