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>
    <allpages apcontinue="Big_Bang-_Bad_Boy" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="927" ns="0" title="Babies and childbirth" />
      <p pageid="2383" ns="0" title="Bad translations" />
      <p pageid="2867" ns="0" title="Badchim" />
      <p pageid="1353" ns="0" title="Banking" />
      <p pageid="72" ns="0" title="Banking and investing" />
      <p pageid="10927" ns="0" title="Baseball" />
      <p pageid="12024" ns="0" title="Bass Guitar Tutorial" />
      <p pageid="14801" ns="0" title="Battle Bay Cheats - Hacks Android And Ios (free!!)" />
      <p pageid="14846" ns="0" title="Beach Buggy Racing Cheats - Generator Android And Ios (REAL GENERATOR)" />
      <p pageid="14848" ns="0" title="Bed Wars Generator - Cheats Android And Ios (FREE METHOD)" />
    </allpages>
  </query>
</api>