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"?>
      <page id="3377" ns="0" title="Nr. 290 Anlage zum Bericht des Botschafters in Petersburg vom 26. Juli, 28. Juli 1914" />
      <page id="3021" ns="0" title="III, 180. Graf Berchtold an Freiherrn von Müller in Tokio, 24. August 1914" />