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="340" ns="6" title="File:ALiVESchematic.jpg" contentmodel="wikitext" pagelanguage="en-gb" touched="2014-12-12T11:59:34Z" lastrevid="1714" counter="63555" length="0" new="" />
      <page pageid="339" ns="6" title="File:Alive logo bif-1-.jpg" contentmodel="wikitext" pagelanguage="en-gb" touched="2014-12-12T11:48:31Z" lastrevid="1711" counter="3819" length="0" new="" />
      <page pageid="53" ns="6" title="File:Icon civ CO.png" contentmodel="wikitext" pagelanguage="en-gb" touched="2015-03-01T14:46:50Z" lastrevid="201" counter="2216" length="19" new="" />
      <page pageid="12" ns="6" title="File:Icon mil opcom.png" contentmodel="wikitext" pagelanguage="en-gb" touched="2017-06-25T17:15:49Z" lastrevid="56" counter="4018" length="0" new="" />
      <page pageid="13" ns="6" title="File:Icon nme SEP2.png" contentmodel="wikitext" pagelanguage="en-gb" touched="2014-11-28T11:40:25Z" lastrevid="57" counter="8899" length="13" new="" />
      <page pageid="29" ns="6" title="File:Icon sys data.png" contentmodel="wikitext" pagelanguage="en-gb" touched="2017-06-16T08:27:35Z" lastrevid="100" counter="3111" length="0" new="" />
      <page pageid="15" ns="6" title="File:Icon sys profile.png" contentmodel="wikitext" pagelanguage="en-gb" touched="2019-05-22T06:55:51Z" lastrevid="59" counter="3314" length="8" new="" />
      <page pageid="33" ns="6" title="File:Icon sys rwg.png" contentmodel="wikitext" pagelanguage="en-gb" touched="2015-10-02T13:54:38Z" lastrevid="107" counter="2858" length="7" new="" />
    </pages>
  </query>
</api>