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>
    <links gplcontinue="1|0|Hamachi" />
  </query-continue>
  <query>
    <pages>
      <page pageid="630" ns="0" title="Absolute Evils OverPower" contentmodel="wikitext" pagelanguage="en" touched="2013-01-14T01:50:07Z" lastrevid="1223" counter="3368" length="14" new="" />
      <page pageid="80" ns="0" title="Aspect Cards" contentmodel="wikitext" pagelanguage="en" touched="2013-01-14T01:50:07Z" lastrevid="1676" counter="6482" length="1502" />
      <page pageid="64" ns="0" title="Basic Universe" contentmodel="wikitext" pagelanguage="en" touched="2012-06-13T20:35:02Z" lastrevid="1438" counter="5194" length="1270" />
      <page pageid="629" ns="0" title="Batman/Superman OverPower" contentmodel="wikitext" pagelanguage="en" touched="2013-02-04T17:33:14Z" lastrevid="1892" counter="8883" length="1708" />
      <page pageid="793" ns="0" title="Card Types" contentmodel="wikitext" pagelanguage="en" touched="2012-12-26T03:35:03Z" lastrevid="1704" counter="8309" length="7832" />
      <page pageid="652" ns="0" title="Character Cards" contentmodel="wikitext" pagelanguage="en" touched="2012-06-13T20:35:02Z" lastrevid="1431" counter="5117" length="1410" />
      <page pageid="621" ns="0" title="Classic OverPower" contentmodel="wikitext" pagelanguage="en" touched="2013-02-04T17:32:11Z" lastrevid="1889" counter="5372" length="1128" />
      <page pageid="631" ns="0" title="DC3 OverPower" contentmodel="wikitext" pagelanguage="en" touched="2013-01-14T01:50:07Z" lastrevid="1542" counter="8688" length="2909" />
      <page pageid="655" ns="0" title="Event Cards" contentmodel="wikitext" pagelanguage="en" touched="2012-06-13T20:35:02Z" lastrevid="1445" counter="3181" length="811" />
      <page pageid="614" ns="0" title="Expansion sets" contentmodel="wikitext" pagelanguage="en" touched="2013-01-14T01:50:07Z" lastrevid="1300" counter="5879" length="5204" />
    </pages>
  </query>
</api>