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" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="414" ns="0" title="B.A.D" />
      <p pageid="427" ns="0" title="BY2" />
      <p pageid="532" ns="0" title="Benelli m2 optifade timber" />
      <p pageid="533" ns="0" title="Benelli military discount" />
      <p pageid="539" ns="0" title="Beretta 1301 tactical" />
      <p pageid="538" ns="0" title="Beretta 92fs" />
      <p pageid="489" ns="0" title="Bet Bed" />
      <p pageid="484" ns="0" title="Bet Ensured Bet" />
      <p pageid="492" ns="0" title="Bet For \U610f\U5473" />
      <p pageid="487" ns="0" title="Bet \U773c\U79d1" />
    </allpages>
  </query>
</api>