xpath xml files within matlab - 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

Answer 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.