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"?>
<api>
  <query>
    <pages>
      <page pageid="733" ns="1" title="Talk:Main Page" contentmodel="wikitext" pagelanguage="en" touched="2011-01-21T11:08:57Z" lastrevid="9222" counter="237566" length="1820" />
      <page pageid="738" ns="0" title="Downloading FAQ" contentmodel="wikitext" pagelanguage="en" touched="2016-05-03T17:34:41Z" lastrevid="9863" counter="1304644" length="5927" />
      <page pageid="739" ns="0" title="Knoppix Remastering Howto" contentmodel="wikitext" pagelanguage="en" touched="2016-05-03T09:11:09Z" lastrevid="9860" counter="2068236" length="7435" />
      <page pageid="742" ns="0" title="Cheat Codes" contentmodel="wikitext" pagelanguage="en" touched="2016-05-03T08:46:53Z" lastrevid="9849" counter="1511708" length="20093" />
      <page pageid="1247" ns="14" title="Category:Bug Pages" contentmodel="wikitext" pagelanguage="en" touched="2016-04-11T23:18:48Z" lastrevid="9706" counter="48707" length="568" />
      <page pageid="1252" ns="14" title="Category:FAQ Page" contentmodel="wikitext" pagelanguage="en" touched="2016-05-10T15:21:12Z" lastrevid="9608" counter="605391" length="580" />
      <page pageid="1253" ns="14" title="Category:Remastering Knoppix" contentmodel="wikitext" pagelanguage="en" touched="2012-02-29T11:39:56Z" lastrevid="9619" counter="104870" length="213" />
      <page pageid="1254" ns="14" title="Category:Hard drive Installation" contentmodel="wikitext" pagelanguage="en" touched="2016-12-15T06:44:58Z" lastrevid="9875" counter="1047325" length="11851" />
      <page pageid="1677" ns="0" title="Main Page Beta" contentmodel="wikitext" pagelanguage="en" touched="2013-01-10T21:52:00Z" lastrevid="9691" counter="27119" length="4574" />
      <page pageid="1678" ns="1" title="Talk:Main Page Beta" contentmodel="wikitext" pagelanguage="en" touched="2008-07-15T00:44:48Z" lastrevid="8170" counter="8094" length="260" />
    </pages>
  </query>
</api>