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="BP6_CB2.png" />
  </query-continue>
  <query>
    <allimages>
      <img name="BEFORE_POST.gif" timestamp="2016-03-24T23:48:12Z" url="http://www.adempiere.com/images/a/a3/BEFORE_POST.gif" descriptionurl="http://www.adempiere.com/File:BEFORE_POST.gif" ns="6" title="File:BEFORE POST.gif" />
      <img name="BOM.jpg" timestamp="2016-03-24T23:48:58Z" url="http://www.adempiere.com/images/0/0f/BOM.jpg" descriptionurl="http://www.adempiere.com/File:BOM.jpg" ns="6" title="File:BOM.jpg" />
      <img name="BOSSIE2015.png" timestamp="2016-04-13T15:01:30Z" url="http://www.adempiere.com/images/e/e9/BOSSIE2015.png" descriptionurl="http://www.adempiere.com/File:BOSSIE2015.png" ns="6" title="File:BOSSIE2015.png" />
      <img name="BP1.png" timestamp="2016-03-24T23:50:11Z" url="http://www.adempiere.com/images/b/bc/BP1.png" descriptionurl="http://www.adempiere.com/File:BP1.png" ns="6" title="File:BP1.png" />
      <img name="BP10_CI.png" timestamp="2016-03-24T23:29:13Z" url="http://www.adempiere.com/images/d/de/BP10_CI.png" descriptionurl="http://www.adempiere.com/File:BP10_CI.png" ns="6" title="File:BP10 CI.png" />
      <img name="BP2.png" timestamp="2016-03-24T23:48:35Z" url="http://www.adempiere.com/images/0/08/BP2.png" descriptionurl="http://www.adempiere.com/File:BP2.png" ns="6" title="File:BP2.png" />
      <img name="BP3_CL.png" timestamp="2016-03-24T23:47:57Z" url="http://www.adempiere.com/images/4/43/BP3_CL.png" descriptionurl="http://www.adempiere.com/File:BP3_CL.png" ns="6" title="File:BP3 CL.png" />
      <img name="BP4_FO.png" timestamp="2016-03-24T23:47:11Z" url="http://www.adempiere.com/images/e/e9/BP4_FO.png" descriptionurl="http://www.adempiere.com/File:BP4_FO.png" ns="6" title="File:BP4 FO.png" />
      <img name="BP5_EP.png" timestamp="2016-03-24T23:47:49Z" url="http://www.adempiere.com/images/4/45/BP5_EP.png" descriptionurl="http://www.adempiere.com/File:BP5_EP.png" ns="6" title="File:BP5 EP.png" />
      <img name="BP6_CB1.png" timestamp="2016-03-24T23:49:49Z" url="http://www.adempiere.com/images/1/1c/BP6_CB1.png" descriptionurl="http://www.adempiere.com/File:BP6_CB1.png" ns="6" title="File:BP6 CB1.png" />
    </allimages>
  </query>
</api>