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>
    <allimages gaicontinue="Broadway1940-2.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="818" ns="6" title="File:Anderson greenhouses.JPG" />
      <page pageid="816" ns="6" title="File:Bballteam1.JPG" />
      <page pageid="849" ns="6" title="File:Beausejour.jpg" />
      <page pageid="840" ns="6" title="File:Bethpagecolonials.jpg" />
      <page pageid="826" ns="6" title="File:BirdsEye 01.JPG" />
      <page pageid="827" ns="6" title="File:BirdsEye 02.JPG" />
      <page pageid="828" ns="6" title="File:BirdsEye 03.JPG" />
      <page pageid="829" ns="6" title="File:BirdsEye 04.JPG" />
      <page pageid="830" ns="6" title="File:BirdsEye 05.JPG" />
      <page pageid="831" ns="6" title="File:BirdsEye 06.JPG" />
    </pages>
  </query>
</api>