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="777" ns="0" title="Big Groove Sector" />
      <page pageid="776" ns="0" title="Black Ice Area" />
      <page pageid="387" ns="0" title="Boulder Kloof" />
      <page pageid="1281" ns="0" title="Hidden Kloof (bouldering, sport and trad)" />
      <page pageid="810" ns="0" title="Little Rock" />
      <page pageid="1" ns="0" title="South African Climbing Wiki" />
      <page pageid="775" ns="0" title="Spout" />
      <page pageid="863" ns="0" title="The Farm" />
      <page pageid="84" ns="0" title="Wilgepoort" />
      <page pageid="892" ns="0" title="Yellowwood Amphitheatre" />
    </pages>
  </query>
</api>