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="Brooder_Arduino" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="152" ns="0" title="Banality of good" />
      <p pageid="47542" ns="0" title="Banana bread" />
      <p pageid="47429" ns="0" title="Beef Industry" />
      <p pageid="107" ns="0" title="Beef industry" />
      <p pageid="47450" ns="0" title="Beekeeping" />
      <p pageid="348" ns="0" title="Beyond organic" />
      <p pageid="9" ns="0" title="Biocides" />
      <p pageid="90" ns="0" title="Biodynamic farming" />
      <p pageid="47526" ns="0" title="Biscuit Mix" />
      <p pageid="168" ns="0" title="Boulder, Colorado" />
    </allpages>
  </query>
</api>