Step 4 – "The X-Files"
or Working with the XML Response
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In the previous example, after the response to the HTTP request was received, we used the reponseText property of the request object and it contained the contents of the test.html file. Now let's try the responseXML property.

First off, let's create a valid XML document that we'll request later on. The document (test.xml) contains the following:

<?xml version="1.0" ?>
    I'm a test.
In the script we only need to change the request line with:
Then in alertContents() we need to replace the alert()-ing line alert(http_request.responseText); with:
var xmldoc = http_request.responseXML;
var root_node = xmldoc.getElementsByTagName('root').item(0);

his way we took the XMLDocument object given by responseXML and we used DOM methods to access some data contained in the XML document. You can see the test.xml here and the updated test script here.

For more on the DOM methods, be sure to check Mozilla's DOM implementation documents.

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