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="20100427214040|Man_made_pond.gif" />
  </query-continue>
  <query>
    <allimages>
      <img name="Grease_headed_to_a_waste_water_treatment_plant.gif" timestamp="2011-03-01T14:12:15Z" user="Woobles" url="https://www.newtechbio.com/wiki/images/1/11/Grease_headed_to_a_waste_water_treatment_plant.gif" descriptionurl="https://www.newtechbio.com/wiki/index.php?title=File:Grease_headed_to_a_waste_water_treatment_plant.gif" ns="6" title="File:Grease headed to a waste water treatment plant.gif" />
      <img name="Greasetrapinspect.gif" timestamp="2011-03-01T14:10:36Z" user="Woobles" url="https://www.newtechbio.com/wiki/images/5/5a/Greasetrapinspect.gif" descriptionurl="https://www.newtechbio.com/wiki/index.php?title=File:Greasetrapinspect.gif" ns="6" title="File:Greasetrapinspect.gif" />
      <img name="Filamentous_Algae_in_a_pond.JPG" timestamp="2011-02-21T23:59:14Z" user="Woobles" url="https://www.newtechbio.com/wiki/images/1/11/Filamentous_Algae_in_a_pond.JPG" descriptionurl="https://www.newtechbio.com/wiki/index.php?title=File:Filamentous_Algae_in_a_pond.JPG" ns="6" title="File:Filamentous Algae in a pond.JPG" />
      <img name="Close_up_of_Filamentous_Algae.jpg" timestamp="2011-02-21T23:57:49Z" user="Woobles" url="https://www.newtechbio.com/wiki/images/6/62/Close_up_of_Filamentous_Algae.jpg" descriptionurl="https://www.newtechbio.com/wiki/index.php?title=File:Close_up_of_Filamentous_Algae.jpg" ns="6" title="File:Close up of Filamentous Algae.jpg" />
      <img name="Duckweed_pond.JPG" timestamp="2011-02-21T22:52:45Z" user="Woobles" url="https://www.newtechbio.com/wiki/images/4/4b/Duckweed_pond.JPG" descriptionurl="https://www.newtechbio.com/wiki/index.php?title=File:Duckweed_pond.JPG" ns="6" title="File:Duckweed pond.JPG" />
      <img name="Duckweed_in_a_pond.JPG" timestamp="2011-02-21T22:51:23Z" user="Woobles" url="https://www.newtechbio.com/wiki/images/b/bb/Duckweed_in_a_pond.JPG" descriptionurl="https://www.newtechbio.com/wiki/index.php?title=File:Duckweed_in_a_pond.JPG" ns="6" title="File:Duckweed in a pond.JPG" />
      <img name="Watermeal_in_a_small_pond.gif" timestamp="2010-05-05T19:08:54Z" user="Woobles" url="https://www.newtechbio.com/wiki/images/4/44/Watermeal_in_a_small_pond.gif" descriptionurl="https://www.newtechbio.com/wiki/index.php?title=File:Watermeal_in_a_small_pond.gif" ns="6" title="File:Watermeal in a small pond.gif" />
      <img name="Watermeal_in_a_container.gif" timestamp="2010-05-05T19:08:04Z" user="Woobles" url="https://www.newtechbio.com/wiki/images/4/4d/Watermeal_in_a_container.gif" descriptionurl="https://www.newtechbio.com/wiki/index.php?title=File:Watermeal_in_a_container.gif" ns="6" title="File:Watermeal in a container.gif" />
      <img name="Watermeal_close_up.gif" timestamp="2010-05-05T19:07:09Z" user="Woobles" url="https://www.newtechbio.com/wiki/images/1/17/Watermeal_close_up.gif" descriptionurl="https://www.newtechbio.com/wiki/index.php?title=File:Watermeal_close_up.gif" ns="6" title="File:Watermeal close up.gif" />
      <img name="Pond_with_algae.jpg" timestamp="2010-04-27T21:41:54Z" user="Woobles" url="https://www.newtechbio.com/wiki/images/b/bf/Pond_with_algae.jpg" descriptionurl="https://www.newtechbio.com/wiki/index.php?title=File:Pond_with_algae.jpg" ns="6" title="File:Pond with algae.jpg" />
    </allimages>
  </query>
</api>