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>
    <allredirects garcontinue="BSFKL|11237" />
  </query-continue>
  <query>
    <pages>
      <page pageid="234" ns="0" title="B" />
      <page pageid="237" ns="0" title="B52 bomber" />
      <page pageid="3484" ns="0" title="Gun 104" />
      <page pageid="11035" ns="0" title="B52" />
      <page pageid="11236" ns="0" title="BSFKL rule" />
      <page pageid="12890" ns="0" title="Period-104 glider gun" />
      <page pageid="12898" ns="0" title="P104 gun" />
      <page pageid="13262" ns="0" title="B-heptaplet" />
      <page pageid="13462" ns="0" title="L200" />
      <page pageid="15346" ns="0" title="B heptomino" />
    </pages>
  </query>
</api>