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>
    <alltransclusions gatcontinue="Col-break" />
  </query-continue>
  <query>
    <pages>
      <page ns="10" title="الگو:Bar box" missing="" />
      <page ns="10" title="الگو:Border-radius" missing="" />
      <page ns="10" title="الگو:Citation" missing="" />
      <page ns="10" title="الگو:Cite book" missing="" />
      <page ns="10" title="الگو:Cite encyclopedia" missing="" />
      <page ns="10" title="الگو:Cite journal" missing="" />
      <page ns="10" title="الگو:Cite news" missing="" />
      <page ns="10" title="الگو:Cite web" missing="" />
      <page ns="10" title="الگو:Clarify" missing="" />
      <page ns="10" title="الگو:Clear" missing="" />
    </pages>
  </query>
</api>