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="20150216114008|Command_Computer.png" />
  </query-continue>
  <query>
    <allimages>
      <img name="ID_CraftOS.png" timestamp="2016-08-21T08:21:01Z" user="Jonjon1234" url="http://www.computercraft.info/wiki/images/b/bd/ID_CraftOS.png" descriptionurl="http://www.computercraft.info/wiki/File:ID_CraftOS.png" ns="6" title="File:ID CraftOS.png" />
      <img name="EnderModem.png" timestamp="2015-12-26T02:54:39Z" user="Bomb Bloke" url="http://www.computercraft.info/wiki/images/4/40/EnderModem.png" descriptionurl="http://www.computercraft.info/wiki/File:EnderModem.png" ns="6" title="File:EnderModem.png" />
      <img name="Grid_Ender_Modem.png" timestamp="2015-12-26T02:35:58Z" user="Bomb Bloke" url="http://www.computercraft.info/wiki/images/4/42/Grid_Ender_Modem.png" descriptionurl="http://www.computercraft.info/wiki/File:Grid_Ender_Modem.png" ns="6" title="File:Grid Ender Modem.png" />
      <img name="Grid_Eye_of_Ender.png" timestamp="2015-12-26T02:32:32Z" user="Bomb Bloke" url="http://www.computercraft.info/wiki/images/0/0e/Grid_Eye_of_Ender.png" descriptionurl="http://www.computercraft.info/wiki/File:Grid_Eye_of_Ender.png" ns="6" title="File:Grid Eye of Ender.png" />
      <img name="LRP_Step3.png" timestamp="2015-10-24T01:44:59Z" user="KnightMiner" url="http://www.computercraft.info/wiki/images/e/e8/LRP_Step3.png" descriptionurl="http://www.computercraft.info/wiki/File:LRP_Step3.png" ns="6" title="File:LRP Step3.png" />
      <img name="LRP_Step2.png" timestamp="2015-10-24T01:44:46Z" user="KnightMiner" url="http://www.computercraft.info/wiki/images/4/43/LRP_Step2.png" descriptionurl="http://www.computercraft.info/wiki/File:LRP_Step2.png" ns="6" title="File:LRP Step2.png" />
      <img name="LRP_Step1.png" timestamp="2015-10-24T01:44:35Z" user="KnightMiner" url="http://www.computercraft.info/wiki/images/b/b9/LRP_Step1.png" descriptionurl="http://www.computercraft.info/wiki/File:LRP_Step1.png" ns="6" title="File:LRP Step1.png" />
      <img name="CraftOS1.7.png" timestamp="2015-08-02T03:59:52Z" user="Bomb Bloke" url="http://www.computercraft.info/wiki/images/9/9d/CraftOS1.7.png" descriptionurl="http://www.computercraft.info/wiki/File:CraftOS1.7.png" ns="6" title="File:CraftOS1.7.png" />
      <img name="PrinterGUI.png" timestamp="2015-02-17T13:20:02Z" user="MKlegoman357" url="http://www.computercraft.info/wiki/images/b/bf/PrinterGUI.png" descriptionurl="http://www.computercraft.info/wiki/File:PrinterGUI.png" ns="6" title="File:PrinterGUI.png" />
      <img name="Iso_Command_Computer.png" timestamp="2015-02-17T12:38:12Z" user="MKlegoman357" url="http://www.computercraft.info/wiki/images/8/82/Iso_Command_Computer.png" descriptionurl="http://www.computercraft.info/wiki/File:Iso_Command_Computer.png" ns="6" title="File:Iso Command Computer.png" />
    </allimages>
  </query>
</api>