You are looking at the HTML representation of the XML format.
HTML is good for debugging, but probably is not suitable for your application.
See complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query>
    <pages>
      <page pageid="1" ns="0" title="Main Page">
        <links>
          <pl ns="0" title="Development" />
          <pl ns="0" title="Glossary" />
          <pl ns="0" title="HardwareReference" />
          <pl ns="0" title="Latest Manual Pages" />
          <pl ns="0" title="Perf events kernel ABI" />
          <pl ns="0" title="Perf tools support for Intel® Processor Trace" />
          <pl ns="0" title="Todo" />
          <pl ns="0" title="Top-Down Analysis" />
          <pl ns="0" title="Tutorial" />
          <pl ns="0" title="Useful Links" />
        </links>
      </page>
    </pages>
  </query>
</api>