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>
    <pages>
      <page pageid="95" ns="0" title="Check point firewall command reference" />
      <page pageid="105" ns="0" title="nokia cpu info" />
      <page pageid="123" ns="0" title="gaia vrrp setup using CLI" />
      <page pageid="129" ns="0" title="61k CMM" />
      <page pageid="139" ns="0" title="SIC General Failure and T get event: bad socket/type" />
      <page pageid="207" ns="0" title="RHEL 6.5 install" />
      <page pageid="213" ns="0" title="centos 6.5 repo" />
      <page pageid="226" ns="0" title="r80 api reference" />
      <page pageid="262" ns="0" title="maestro reference" />
    </pages>
  </query>
</api>