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="20140320100712|Centrosolar.png" />
  </query-continue>
  <query>
    <allimages>
      <img name="Germany_icon.png" timestamp="2014-03-21T03:12:39Z" user="Edt" url="http://dewiki.nl/images/5/59/Germany_icon.png" descriptionurl="http://dewiki.nl/index.php?title=Bestand:Germany_icon.png" ns="6" title="Bestand:Germany icon.png" />
      <img name="Red_Cross_16x16.png" timestamp="2014-03-21T03:01:30Z" user="Edt" url="http://dewiki.nl/images/2/26/Red_Cross_16x16.png" descriptionurl="http://dewiki.nl/index.php?title=Bestand:Red_Cross_16x16.png" ns="6" title="Bestand:Red Cross 16x16.png" />
      <img name="Checkmark_12x12.png" timestamp="2014-03-21T01:57:24Z" user="Edt" url="http://dewiki.nl/images/5/51/Checkmark_12x12.png" descriptionurl="http://dewiki.nl/index.php?title=Bestand:Checkmark_12x12.png" ns="6" title="Bestand:Checkmark 12x12.png" />
      <img name="Checkmark_16x16.png" timestamp="2014-03-21T01:57:11Z" user="Edt" url="http://dewiki.nl/images/6/6d/Checkmark_16x16.png" descriptionurl="http://dewiki.nl/index.php?title=Bestand:Checkmark_16x16.png" ns="6" title="Bestand:Checkmark 16x16.png" />
      <img name="Luxembourg_icon.png" timestamp="2014-03-21T01:31:32Z" user="Edt" url="http://dewiki.nl/images/a/a1/Luxembourg_icon.png" descriptionurl="http://dewiki.nl/index.php?title=Bestand:Luxembourg_icon.png" ns="6" title="Bestand:Luxembourg icon.png" />
      <img name="Belgium_icon.png" timestamp="2014-03-21T01:31:21Z" user="Edt" url="http://dewiki.nl/images/5/5b/Belgium_icon.png" descriptionurl="http://dewiki.nl/index.php?title=Bestand:Belgium_icon.png" ns="6" title="Bestand:Belgium icon.png" />
      <img name="Netherlands_icon.png" timestamp="2014-03-21T01:30:38Z" user="Edt" url="http://dewiki.nl/images/8/81/Netherlands_icon.png" descriptionurl="http://dewiki.nl/index.php?title=Bestand:Netherlands_icon.png" ns="6" title="Bestand:Netherlands icon.png" />
      <img name="Vlag-van-Belgie.svg" timestamp="2014-03-20T13:59:41Z" user="Paul" url="http://dewiki.nl/images/0/05/Vlag-van-Belgie.svg" descriptionurl="http://dewiki.nl/index.php?title=Bestand:Vlag-van-Belgie.svg" ns="6" title="Bestand:Vlag-van-Belgie.svg" />
      <img name="Flag_of_Belgium.svg" timestamp="2014-03-20T13:57:12Z" user="Paul" url="http://dewiki.nl/images/6/65/Flag_of_Belgium.svg" descriptionurl="http://dewiki.nl/index.php?title=Bestand:Flag_of_Belgium.svg" ns="6" title="Bestand:Flag of Belgium.svg" />
      <img name="Warmtehuishouding_volgens_PHPP.png" timestamp="2014-03-20T10:07:55Z" user="Paul" url="http://dewiki.nl/images/3/39/Warmtehuishouding_volgens_PHPP.png" descriptionurl="http://dewiki.nl/index.php?title=Bestand:Warmtehuishouding_volgens_PHPP.png" ns="6" title="Bestand:Warmtehuishouding volgens PHPP.png" />
    </allimages>
  </query>
</api>