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 aicontinue="Blackberry.jpg" />
  </query-continue>
  <query>
    <allimages>
      <img name="Badger.jpg" timestamp="2008-02-13T19:35:24Z" url="http://www.rivertwine.com/resources/images/Badger.jpg" descriptionurl="http://www.rivertwine.com/resources/index.php?title=File:Badger.jpg" ns="6" title="File:Badger.jpg" />
      <img name="Bass_largemouth.jpg" timestamp="2008-02-13T15:29:30Z" url="http://www.rivertwine.com/resources/images/Bass_largemouth.jpg" descriptionurl="http://www.rivertwine.com/resources/index.php?title=File:Bass_largemouth.jpg" ns="6" title="File:Bass largemouth.jpg" />
      <img name="Bass_striped.jpg" timestamp="2008-02-13T15:29:49Z" url="http://www.rivertwine.com/resources/images/Bass_striped.jpg" descriptionurl="http://www.rivertwine.com/resources/index.php?title=File:Bass_striped.jpg" ns="6" title="File:Bass striped.jpg" />
      <img name="Bat.jpg" timestamp="2008-02-13T19:35:45Z" url="http://www.rivertwine.com/resources/images/Bat.jpg" descriptionurl="http://www.rivertwine.com/resources/index.php?title=File:Bat.jpg" ns="6" title="File:Bat.jpg" />
      <img name="Bear-black.jpg" timestamp="2008-02-13T19:36:10Z" url="http://www.rivertwine.com/resources/images/Bear-black.jpg" descriptionurl="http://www.rivertwine.com/resources/index.php?title=File:Bear-black.jpg" ns="6" title="File:Bear-black.jpg" />
      <img name="Bear-brown.jpg" timestamp="2008-02-13T19:36:35Z" url="http://www.rivertwine.com/resources/images/Bear-brown.jpg" descriptionurl="http://www.rivertwine.com/resources/index.php?title=File:Bear-brown.jpg" ns="6" title="File:Bear-brown.jpg" />
      <img name="Beaver.jpg" timestamp="2008-02-13T19:36:56Z" url="http://www.rivertwine.com/resources/images/Beaver.jpg" descriptionurl="http://www.rivertwine.com/resources/index.php?title=File:Beaver.jpg" ns="6" title="File:Beaver.jpg" />
      <img name="Big_horn.jpg" timestamp="2008-02-13T19:37:17Z" url="http://www.rivertwine.com/resources/images/Big_horn.jpg" descriptionurl="http://www.rivertwine.com/resources/index.php?title=File:Big_horn.jpg" ns="6" title="File:Big horn.jpg" />
      <img name="Bk_2007_holiday_wishes.jpg" timestamp="2008-02-07T14:54:11Z" url="http://www.rivertwine.com/resources/images/Bk_2007_holiday_wishes.jpg" descriptionurl="http://www.rivertwine.com/resources/index.php?title=File:Bk_2007_holiday_wishes.jpg" ns="6" title="File:Bk 2007 holiday wishes.jpg" />
      <img name="Black_rat_snake.jpg" timestamp="2008-02-13T19:37:38Z" url="http://www.rivertwine.com/resources/images/Black_rat_snake.jpg" descriptionurl="http://www.rivertwine.com/resources/index.php?title=File:Black_rat_snake.jpg" ns="6" title="File:Black rat snake.jpg" />
    </allimages>
  </query>
</api>