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 plcontinue="1|0|Hamachi" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1" ns="0" title="Main Page">
        <links>
          <pl ns="0" title="Absolute Evils OverPower" />
          <pl ns="0" title="Aspect Cards" />
          <pl ns="0" title="Basic Universe" />
          <pl ns="0" title="Batman/Superman OverPower" />
          <pl ns="0" title="Card Types" />
          <pl ns="0" title="Character Cards" />
          <pl ns="0" title="Classic OverPower" />
          <pl ns="0" title="DC3 OverPower" />
          <pl ns="0" title="Event Cards" />
          <pl ns="0" title="Expansion sets" />
        </links>
      </page>
    </pages>
  </query>
</api>