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>
    <allredirects garcontinue="Blueco_Incidence|1974" />
  </query-continue>
  <query>
    <pages>
      <page pageid="147" ns="0" title="Bloodpool" />
      <page pageid="1654" ns="0" title="The Black Pirates Pub" />
      <page pageid="1665" ns="0" title="Billy Houston" />
      <page pageid="2490" ns="0" title="Blue Monday" />
      <page pageid="2551" ns="0" title="Bittermorning" />
      <page pageid="3040" ns="0" title="The Blue Pretenders" />
      <page pageid="3061" ns="0" title="BPP" />
      <page pageid="3178" ns="0" title="Black Pirate Pub" />
      <page pageid="3200" ns="0" title="Benny Bloodlust" />
      <page pageid="4599" ns="0" title="Basement Rituals Vol 11 Bronze Edition" />
    </pages>
  </query>
</api>