You are looking at the HTML representation of the XML format.
HTML is good for debugging, but is unsuitable for application use.
Specify the format parameter to change the output format.
To see the non HTML representation of the XML format, set format=xml.
See the complete documentation, or API help for more information.
<?xml version="1.0"?>
    <querypage qpoffset="10" />
    <querypage name="Ancientpages">
        <page value="20071025141724" timestamp="2007-10-25T14:17:24Z" ns="0" title="BigChanges" />
        <page value="20080513100631" timestamp="2008-05-13T10:06:31Z" ns="0" title="XACE" />
        <page value="20080513101839" timestamp="2008-05-13T10:18:39Z" ns="0" title="Developer Summit 2008/Topics" />
        <page value="20080514102621" timestamp="2008-05-14T10:26:21Z" ns="0" title="Credits" />
        <page value="20080516020422" timestamp="2008-05-16T02:04:22Z" ns="0" title="TLS Certificate" />
        <page value="20080522094441" timestamp="2008-05-22T09:44:41Z" ns="0" title="Test Ignore" />
        <page value="20080524062427" timestamp="2008-05-24T06:24:27Z" ns="0" title="Documentation" />
        <page value="20080603030620" timestamp="2008-06-03T03:06:20Z" ns="0" title="Taiga" />
        <page value="20080716215924" timestamp="2008-07-16T21:59:24Z" ns="0" title="Developer Summit 2008" />
        <page value="20080723131702" timestamp="2008-07-23T13:17:02Z" ns="0" title="Developer Summit 2008/Schedule" />