xpath xml files within matlab

Question

Is it possible to read,compare and look for a specefic strings in xml files using xpath from Matlab ? I don't find any documentation.

could someone give me an example ?

<?xml version="1.0" encoding="UTF-8"?> 
<address xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation='test.xsd'>
 <lists name="myState">
         <description name="-temp">-20</description>
         <description name="localization">north</description>  
         <description name="-state">false</description> 
  </lists>
</address>  
<language language="english" name=""> 
     <description name="population">5000</description> 
</language>

here to access to description name="localization"> , I did :

docNode = xmlread(myXMLFILE);
factory = XPathFactory.newInstance;
xpath = factory.newXPath;

% compile and evaluate the XPath Expression
 expression = xpath.compile(adress/lists/description')
description = expression.evaluate(docNode, XPathConstants.NODE);
descriptionValue = phoneNumberNode.getTextContent  % this gives me -20

how can I get the value of ?

thanks

yuk · Accepted Answer · 2012-04-20 16:38:37Z

1

Have you tried Google? One of the first link gave me a good example of using XPath on FileExchange:

Using XPath from MATLAB

An XPath package started shipping as part of Java 5, so we can use it from MATLAB. This is a simple example.

The Java XPath API tutorial on ibm.com is a good introduction to XPath in Java.

% Import the XPath classes
import javax.xml.xpath.*

% Construct the DOM.
doc = xmlread(which('demos/demos.xml'));

% Create an XPath expression.
factory = XPathFactory.newInstance;
xpath = factory.newXPath;
expression = xpath.compile('//demosection/label');

% Apply the expression to the DOM.
nodeList = expression.evaluate(doc,XPathConstants.NODESET);

% Iterate through the nodes that are returned.
for i = 1:nodeList.getLength
    node = nodeList.item(i-1);
    disp(char(node.getFirstChild.getNodeValue))
end

Another good article is in Mike's blog - XML and MATLAB: Navigating a Tree. It has a part specifically on using XPath.

answered Apr 20, 2012 at 16:38

yuk

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1 Comment

lola Over a year ago

hello yuk, I've updated my question by pointing the example of xml file and the code trying to access to nodes , could you help please ?

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