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="Benefits_of_On_the_web_Betting4376350" />
  </query-continue>
  <query>
    <allpages>
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      <p pageid="77" ns="0" title="Bases De Datos Empresas700487" />
      <p pageid="459" ns="0" title="Benefits Of Rooting Your Android Device3492557" />
      <p pageid="460" ns="0" title="Benefits Of Rooting Your Android Device5588497" />
      <p pageid="376" ns="0" title="Benefits of Buying Pet Supplies Online7406216" />
      <p pageid="394" ns="0" title="Benefits of On the internet Betting3788136" />
    </allpages>
  </query>
</api>