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>
    <allredirects garcontinue="Emma_Haumüller-Müller|861" />
  </query-continue>
  <query>
    <pages>
      <page pageid="836" ns="0" title="Christian Dagobert Gysendoerffer" />
      <page pageid="896" ns="0" title="Bernhard Jaeggi" />
      <page pageid="931" ns="0" title="Emil Kraeuliger" />
      <page pageid="974" ns="0" title="Emil Luethy" />
      <page pageid="1016" ns="0" title="Christian Adolf Mueller" />
      <page pageid="1018" ns="0" title="Emil Mueller" />
      <page pageid="1020" ns="0" title="Emilio Mueller" />
      <page pageid="1028" ns="0" title="Edmund Nuesperli" />
      <page pageid="1045" ns="0" title="Emil Puempin" />
      <page pageid="2191" ns="0" title="Eudard Balmer" />
    </pages>
  </query>
</api>