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="Category_Rituals.jpg" />
  </query-continue>
  <query>
    <allimages>
      <img name="Categories.jpg" timestamp="2011-02-27T13:58:45Z" url="http://ketab-kuche.com/images/2/22/Categories.jpg" descriptionurl="http://ketab-kuche.com/index.php?title=%D9%BE%D8%B1%D9%88%D9%86%D8%AF%D9%87:Categories.jpg" ns="6" title="پرونده:Categories.jpg" />
      <img name="Category_Allegories.jpg" timestamp="2011-02-27T14:44:32Z" url="http://ketab-kuche.com/images/3/36/Category_Allegories.jpg" descriptionurl="http://ketab-kuche.com/index.php?title=%D9%BE%D8%B1%D9%88%D9%86%D8%AF%D9%87:Category_Allegories.jpg" ns="6" title="پرونده:Category Allegories.jpg" />
      <img name="Category_Beleif.jpg" timestamp="2011-02-27T14:45:29Z" url="http://ketab-kuche.com/images/4/4e/Category_Beleif.jpg" descriptionurl="http://ketab-kuche.com/index.php?title=%D9%BE%D8%B1%D9%88%D9%86%D8%AF%D9%87:Category_Beleif.jpg" ns="6" title="پرونده:Category Beleif.jpg" />
      <img name="Category_Dreams.jpg" timestamp="2011-02-27T14:46:24Z" url="http://ketab-kuche.com/images/4/47/Category_Dreams.jpg" descriptionurl="http://ketab-kuche.com/index.php?title=%D9%BE%D8%B1%D9%88%D9%86%D8%AF%D9%87:Category_Dreams.jpg" ns="6" title="پرونده:Category Dreams.jpg" />
      <img name="Category_Encyclopedia.jpg" timestamp="2011-02-27T14:47:53Z" url="http://ketab-kuche.com/images/8/83/Category_Encyclopedia.jpg" descriptionurl="http://ketab-kuche.com/index.php?title=%D9%BE%D8%B1%D9%88%D9%86%D8%AF%D9%87:Category_Encyclopedia.jpg" ns="6" title="پرونده:Category Encyclopedia.jpg" />
      <img name="Category_Games_Songs.jpg" timestamp="2011-02-27T15:48:57Z" url="http://ketab-kuche.com/images/9/96/Category_Games_Songs.jpg" descriptionurl="http://ketab-kuche.com/index.php?title=%D9%BE%D8%B1%D9%88%D9%86%D8%AF%D9%87:Category_Games_Songs.jpg" ns="6" title="پرونده:Category Games Songs.jpg" />
      <img name="Category_OtherGrammar.jpg" timestamp="2011-02-27T15:52:38Z" url="http://ketab-kuche.com/images/e/e6/Category_OtherGrammar.jpg" descriptionurl="http://ketab-kuche.com/index.php?title=%D9%BE%D8%B1%D9%88%D9%86%D8%AF%D9%87:Category_OtherGrammar.jpg" ns="6" title="پرونده:Category OtherGrammar.jpg" />
      <img name="Category_Poems.jpg" timestamp="2011-02-27T15:56:17Z" url="http://ketab-kuche.com/images/c/c9/Category_Poems.jpg" descriptionurl="http://ketab-kuche.com/index.php?title=%D9%BE%D8%B1%D9%88%D9%86%D8%AF%D9%87:Category_Poems.jpg" ns="6" title="پرونده:Category Poems.jpg" />
      <img name="Category_Proverbs.jpg" timestamp="2011-02-27T15:57:11Z" url="http://ketab-kuche.com/images/6/68/Category_Proverbs.jpg" descriptionurl="http://ketab-kuche.com/index.php?title=%D9%BE%D8%B1%D9%88%D9%86%D8%AF%D9%87:Category_Proverbs.jpg" ns="6" title="پرونده:Category Proverbs.jpg" />
      <img name="Category_Questionaires.jpg" timestamp="2011-02-27T15:58:39Z" url="http://ketab-kuche.com/images/b/b6/Category_Questionaires.jpg" descriptionurl="http://ketab-kuche.com/index.php?title=%D9%BE%D8%B1%D9%88%D9%86%D8%AF%D9%87:Category_Questionaires.jpg" ns="6" title="پرونده:Category Questionaires.jpg" />
    </allimages>
  </query>
</api>