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>
    <recentchanges rccontinue="2009-11-07T18:19:39Z|299" />
  </query-continue>
  <query>
    <recentchanges>
      <rc type="edit" ns="0" title="3D Reconstructions of in vitro Unconstrained Shells" rcid="309" pageid="37" revid="313" old_revid="312" timestamp="2010-05-04T15:25:39Z" />
      <rc type="edit" ns="0" title="3D Reconstructions of in vitro Unconstrained Shells" rcid="308" pageid="37" revid="312" old_revid="247" timestamp="2010-05-04T15:24:47Z" />
      <rc type="edit" ns="0" title="Implementation in C++" rcid="307" pageid="43" revid="311" old_revid="223" timestamp="2009-11-22T01:02:31Z" />
      <rc type="edit" ns="0" title="CometWiki" rcid="306" pageid="1" revid="310" old_revid="309" timestamp="2009-11-16T01:35:57Z" />
      <rc type="edit" ns="0" title="CometWiki" rcid="305" pageid="1" revid="309" old_revid="292" timestamp="2009-11-16T01:35:43Z" />
      <rc type="new" ns="8" title="MediaWiki:Desc-0-Description of the Model" rcid="304" pageid="61" revid="308" old_revid="0" timestamp="2009-11-07T18:58:22Z" />
      <rc type="new" ns="8" title="MediaWiki:Desc-0-Ellipsoid and Capsule symmetry breaking" rcid="303" pageid="60" revid="307" old_revid="0" timestamp="2009-11-07T18:57:16Z" />
      <rc type="new" ns="8" title="MediaWiki:Desc-0-Forces during Symmetry Breaking" rcid="302" pageid="59" revid="306" old_revid="0" timestamp="2009-11-07T18:56:14Z" />
      <rc type="new" ns="8" title="MediaWiki:Desc-0-Symmetry Breaking and Motility" rcid="301" pageid="58" revid="305" old_revid="0" timestamp="2009-11-07T18:55:36Z" />
      <rc type="new" ns="8" title="MediaWiki:Desc-0-CometWiki" rcid="300" pageid="57" revid="304" old_revid="0" timestamp="2009-11-07T18:46:52Z" />
    </recentchanges>
  </query>
</api>