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>
    <alllinks galcontinue="BGP-LS/PCEP:Release_Plan_2013|213" />
  </query-continue>
  <query>
    <pages>
      <page pageid="310" ns="0" title="BGP LS PCEP:Main" />
      <page pageid="788" ns="0" title="Release/Hydrogen" />
      <page pageid="907" ns="0" title="BGP-LS/PCEP:Release Plan 2013" />
      <page pageid="1202" ns="0" title="Simultaneous Release:Helium Release Plan" />
      <page pageid="1536" ns="0" title="OpenDaylight Controller:MD-SAL:Component Map" />
      <page pageid="1539" ns="0" title="Simultaneous Release:Helium:Suggestions for Participating Projects" />
      <page pageid="1933" ns="0" title="TCPMD5:Main" />
      <page pageid="2087" ns="0" title="Simultaneous Release:Lithium Release Plan" />
    </pages>
  </query>
</api>