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>
    <allimages>
      <img name="Thermalbase.png" timestamp="2012-01-07T06:14:11Z" user="Craig Peacock" url="https://wiki.beyondlogic.org/images/8/82/Thermalbase.png" descriptionurl="https://wiki.beyondlogic.org/index.php?title=File:Thermalbase.png" ns="6" title="File:Thermalbase.png" />
      <img name="Consoleconnected.png" timestamp="2012-01-07T06:06:37Z" user="Craig Peacock" url="https://wiki.beyondlogic.org/images/4/49/Consoleconnected.png" descriptionurl="https://wiki.beyondlogic.org/index.php?title=File:Consoleconnected.png" ns="6" title="File:Consoleconnected.png" />
      <img name="Base_metal_mass.png" timestamp="2012-01-07T06:03:42Z" user="Craig Peacock" url="https://wiki.beyondlogic.org/images/8/80/Base_metal_mass.png" descriptionurl="https://wiki.beyondlogic.org/index.php?title=File:Base_metal_mass.png" ns="6" title="File:Base metal mass.png" />
      <img name="Goflexhome_bottom_pcb.png" timestamp="2012-01-07T04:45:21Z" user="Craig Peacock" url="https://wiki.beyondlogic.org/images/b/b0/Goflexhome_bottom_pcb.png" descriptionurl="https://wiki.beyondlogic.org/index.php?title=File:Goflexhome_bottom_pcb.png" ns="6" title="File:Goflexhome bottom pcb.png" />
      <img name="Goflexhome_pcb_top.png" timestamp="2012-01-07T04:43:44Z" user="Craig Peacock" url="https://wiki.beyondlogic.org/images/1/10/Goflexhome_pcb_top.png" descriptionurl="https://wiki.beyondlogic.org/index.php?title=File:Goflexhome_pcb_top.png" ns="6" title="File:Goflexhome pcb top.png" />
      <img name="PCB_Top_NoHeatSink.jpg" timestamp="2011-11-12T12:06:01Z" user="Craig Peacock" url="https://wiki.beyondlogic.org/images/3/3d/PCB_Top_NoHeatSink.jpg" descriptionurl="https://wiki.beyondlogic.org/index.php?title=File:PCB_Top_NoHeatSink.jpg" ns="6" title="File:PCB Top NoHeatSink.jpg" />
      <img name="PCB_Top_NoHeatSink_Large.JPG" timestamp="2011-11-12T12:01:52Z" user="Craig Peacock" url="https://wiki.beyondlogic.org/images/7/79/PCB_Top_NoHeatSink_Large.JPG" descriptionurl="https://wiki.beyondlogic.org/index.php?title=File:PCB_Top_NoHeatSink_Large.JPG" ns="6" title="File:PCB Top NoHeatSink Large.JPG" />
    </allimages>
  </query>
</api>