MATLAB: accessing XML object

Question

In MATLAB, I load an XML file docNode = xmlread('stuff.xml');. stuff.xml is the following:

<?xml version="1.0"?>
<rss version="2.0" xmlns:g="http://somesite.com">
    <channel>
        <title>Blah</title>
        <link>http://www.blah.com</link>
        <description>BLAH.COM </description>
        <item>    
            <link>http://www.blah.com/page</link>
        </item>
    </channel>
</rss>

I'm trying to retrieve that string in <link> but it is proving to be quite tricky.. I'm reading this blog http://blogs.mathworks.com/desktop/2010/11/01/xml-and-matlab-navigating-a-tree/ but I still can't figure it out! Can someone chime in on how to get access to <link>? TIA!

Sam Roberts · Accepted Answer · 2011-11-15 17:29:50Z

3

Does this do what you need?

>> docNode = xmlread('stuff.xml');
>> l = docNode.getElementsByTagName('link');
>> char(l.item(0).getFirstChild.getData)
ans =
http://www.blah.com
>> char(l.item(1).getFirstChild.getData)
ans =
http://www.blah.com/page

PS you have an error in stuff.xml - it should be </channel>, not </<channel>.

Edit: To loop directly through each link, you can use l.getLength:

for i = 0:(l.getLength - 1) % 0-based indexing, not 1-based like MATLAB arrays
    char(l.item(i).getFirstChild.getData)
end

ans =
http://www.blah.com
ans =
http://www.blah.com/page

edited Nov 15, 2011 at 17:29

answered Nov 15, 2011 at 9:56

Sam Roberts

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2 Comments

laketuna Over a year ago

Hey Sam, yes it does. Thank you so much! If there are more than one <item>, how do you loop through them?

laketuna Over a year ago

Discard the question. I figured it out shortly after posting it. I'm wondering why you would get the link element first instead of serially access it, though. But all works.

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