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-continue>
    <backlinks gblcontinue="0|Main_Page|710" />
  </query-continue>
  <query>
    <pages>
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      <page pageid="184" ns="10" title="Template:IRidium Gate" contentmodel="wikitext" pagelanguage="en" touched="2013-08-30T08:29:04Z" lastrevid="2821" counter="1580" length="379" />
      <page pageid="243" ns="0" title="Description of iRidium for KNX" contentmodel="wikitext" pagelanguage="en" touched="2014-11-14T05:12:18Z" lastrevid="2278" counter="7484" length="6775" />
      <page pageid="395" ns="0" title="Working with Equipment" contentmodel="wikitext" pagelanguage="en" touched="2014-11-20T06:52:09Z" lastrevid="3880" counter="22545" length="22338" />
      <page pageid="474" ns="0" title="IRidium App" contentmodel="wikitext" pagelanguage="en" touched="2016-09-29T09:22:54Z" lastrevid="4112" counter="41628" length="6789" />
      <page pageid="478" ns="10" title="Template:How it works" contentmodel="wikitext" pagelanguage="en" touched="2014-06-06T08:08:21Z" lastrevid="3558" counter="1988" length="1027" />
      <page pageid="536" ns="0" title="Description of iRidium for AV &amp; Custom Systems" contentmodel="wikitext" pagelanguage="en" touched="2014-11-14T05:12:18Z" lastrevid="1674" counter="5379" length="7433" />
      <page pageid="587" ns="0" title="Description of iRidium for KNX IP BAOS" contentmodel="wikitext" pagelanguage="en" touched="2014-11-14T05:12:18Z" lastrevid="2280" counter="4895" length="7849" />
      <page pageid="660" ns="0" title="Description of iRidium for Modbus" contentmodel="wikitext" pagelanguage="en" touched="2014-11-14T05:12:18Z" lastrevid="1939" counter="5288" length="5954" />
    </pages>
  </query>
</api>