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>
    <templates gtlcontinue="1|10|Recent_writings" />
  </query-continue>
  <query>
    <pages>
      <page pageid="3663" ns="10" title="Template:Current Citizen-Diplomats" contentmodel="wikitext" pagelanguage="en" touched="2015-03-27T13:06:50Z" lastrevid="9998" counter="1956" length="150" />
      <page pageid="3662" ns="10" title="Template:Current Citizen-Initiator" contentmodel="wikitext" pagelanguage="en" touched="2015-03-21T18:14:03Z" lastrevid="9871" counter="1078" length="142" />
      <page pageid="3664" ns="10" title="Template:Current Citizen-Liaison" contentmodel="wikitext" pagelanguage="en" touched="2015-03-21T18:21:19Z" lastrevid="9873" counter="883" length="157" new="" />
      <page pageid="3665" ns="10" title="Template:Current Citizen-Sergeant" contentmodel="wikitext" pagelanguage="en" touched="2015-03-27T13:08:15Z" lastrevid="9999" counter="1293" length="231" />
      <page pageid="3666" ns="10" title="Template:Current Dean" contentmodel="wikitext" pagelanguage="en" touched="2015-03-21T18:23:55Z" lastrevid="9875" counter="751" length="115" new="" />
      <page pageid="2647" ns="10" title="Template:Current delegate" contentmodel="wikitext" pagelanguage="en" touched="2015-03-27T13:06:14Z" lastrevid="9997" counter="6789" length="138" />
      <page pageid="3267" ns="10" title="Template:Current ecclesia" contentmodel="wikitext" pagelanguage="en" touched="2016-07-12T02:29:10Z" lastrevid="10600" counter="5544" length="1201" />
      <page pageid="2599" ns="10" title="Template:Current featured article" contentmodel="wikitext" pagelanguage="en" touched="2015-01-10T06:07:04Z" lastrevid="9558" counter="4670" length="1861" />
      <page pageid="2600" ns="10" title="Template:Current featured image" contentmodel="wikitext" pagelanguage="en" touched="2014-09-09T17:45:02Z" lastrevid="8930" counter="2995" length="761" />
      <page pageid="2497" ns="10" title="Template:Infobox government" contentmodel="wikitext" pagelanguage="en" touched="2016-07-12T02:29:10Z" lastrevid="10124" counter="6970" length="1180" />
    </pages>
  </query>
</api>