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="Behavior_1_3_result.PNG" />
  </query-continue>
  <query>
    <allimages>
      <img name="BON_token_text.png" timestamp="2006-05-12T18:59:22Z" url="https://dev.eiffel.com/upload/b/b6/BON_token_text.png" descriptionurl="https://dev.eiffel.com/File:BON_token_text.png" ns="6" title="File:BON token text.png" />
      <img name="Basic_class_menu.PNG" timestamp="2007-04-17T22:25:05Z" url="https://dev.eiffel.com/upload/7/76/Basic_class_menu.PNG" descriptionurl="https://dev.eiffel.com/File:Basic_class_menu.PNG" ns="6" title="File:Basic class menu.PNG" />
      <img name="Basic_cluster_menu.PNG" timestamp="2007-04-17T22:27:52Z" url="https://dev.eiffel.com/upload/e/ea/Basic_cluster_menu.PNG" descriptionurl="https://dev.eiffel.com/File:Basic_cluster_menu.PNG" ns="6" title="File:Basic cluster menu.PNG" />
      <img name="Basic_editor_menu.PNG" timestamp="2007-04-17T22:18:18Z" url="https://dev.eiffel.com/upload/2/20/Basic_editor_menu.PNG" descriptionurl="https://dev.eiffel.com/File:Basic_editor_menu.PNG" ns="6" title="File:Basic editor menu.PNG" />
      <img name="Basic_feature_menu.PNG" timestamp="2007-04-17T22:26:32Z" url="https://dev.eiffel.com/upload/c/ce/Basic_feature_menu.PNG" descriptionurl="https://dev.eiffel.com/File:Basic_feature_menu.PNG" ns="6" title="File:Basic feature menu.PNG" />
      <img name="Behavior_1_1_pasted_at.PNG" timestamp="2012-04-27T03:55:52Z" url="https://dev.eiffel.com/upload/d/d9/Behavior_1_1_pasted_at.PNG" descriptionurl="https://dev.eiffel.com/File:Behavior_1_1_pasted_at.PNG" ns="6" title="File:Behavior 1 1 pasted at.PNG" />
      <img name="Behavior_1_1_result.PNG" timestamp="2012-04-28T01:35:03Z" url="https://dev.eiffel.com/upload/b/b3/Behavior_1_1_result.PNG" descriptionurl="https://dev.eiffel.com/File:Behavior_1_1_result.PNG" ns="6" title="File:Behavior 1 1 result.PNG" />
      <img name="Behavior_1_2_pasted_at.PNG" timestamp="2012-04-27T04:12:22Z" url="https://dev.eiffel.com/upload/c/c8/Behavior_1_2_pasted_at.PNG" descriptionurl="https://dev.eiffel.com/File:Behavior_1_2_pasted_at.PNG" ns="6" title="File:Behavior 1 2 pasted at.PNG" />
      <img name="Behavior_1_2_result.PNG" timestamp="2012-04-27T04:13:09Z" url="https://dev.eiffel.com/upload/c/cc/Behavior_1_2_result.PNG" descriptionurl="https://dev.eiffel.com/File:Behavior_1_2_result.PNG" ns="6" title="File:Behavior 1 2 result.PNG" />
      <img name="Behavior_1_3_pasted_at.PNG" timestamp="2012-04-27T04:15:41Z" url="https://dev.eiffel.com/upload/b/bd/Behavior_1_3_pasted_at.PNG" descriptionurl="https://dev.eiffel.com/File:Behavior_1_3_pasted_at.PNG" ns="6" title="File:Behavior 1 3 pasted at.PNG" />
    </allimages>
  </query>
</api>