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MediaWiki API Result
You are looking at the HTML representation of the XML format.
HTML is good for debugging, but probably is not suitable for your application.
See complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query>
    <pages>
      <page pageid="7" ns="6" title="File:PSI 6224s.jpg" />
      <page pageid="8" ns="6" title="File:PSI 6243s.jpg" />
      <page pageid="9" ns="6" title="File:PSI 6280s.jpg" />
      <page pageid="10" ns="6" title="File:PSI 6329s.jpg" />
      <page pageid="11" ns="6" title="File:PSI 6336s.jpg" />
      <page pageid="12" ns="6" title="File:PSI 6393s.jpg" />
      <page pageid="13" ns="6" title="File:PSI 6441s.jpg" />
      <page pageid="14" ns="6" title="File:PSI 6471s.jpg" />
      <page pageid="15" ns="6" title="File:PSI 6477s.jpg" />
      <page pageid="16" ns="6" title="File:PSI 6479s.jpg" />
    </pages>
  </query>
</api>