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>
    <allpages>
      <p pageid="1542" ns="0" title="BGroom" />
      <p pageid="2966" ns="0" title="Baby Boomers: Cash Cruise" />
      <p pageid="4813" ns="0" title="Babylon Casino – Fisherman&#039;s Wharf" />
      <p pageid="4720" ns="0" title="Baccarat Casino" />
      <p pageid="3751" ns="0" title="Back in Time" />
      <p pageid="4210" ns="0" title="Bahama Mama" />
      <p pageid="4661" ns="0" title="Bahiti&#039;s Club Atlantis - Trinidad" />
      <p pageid="4647" ns="0" title="Bahiti&#039;s Club Bingo - Cochabamba" />
      <p pageid="4649" ns="0" title="Bahiti&#039;s Club Bingo - La Paz" />
      <p pageid="4655" ns="0" title="Bahiti&#039;s Club Bingo - Santa Cruz" />
    </allpages>
  </query>
  <query-continue>
    <allpages apcontinue="Bahiti&#039;s_Club_Bingo_-_Tarija" />
  </query-continue>
</api>