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>
    <alllinks galcontinue="BMT_10_2015/Seite_2" />
  </query-continue>
  <query>
    <pages>
      <page ns="0" title="B:en:Template:Cat see also" missing="" />
      <page ns="0" title="BIO LK 2006 - 2008" missing="" />
      <page pageid="11897" ns="0" title="BDs zum Thema &quot;Mit Französisch um die Welt" />
      <page pageid="13192" ns="0" title="BMT 10 2014" />
      <page pageid="13193" ns="0" title="BMT 10 2014/Seite 1" />
      <page pageid="13194" ns="0" title="BMT 10 2014/Seite 2" />
      <page pageid="13195" ns="0" title="BMT 10 2014/Seite 3" />
      <page pageid="13196" ns="0" title="BMT 10 2014/Seite 4" />
      <page pageid="13171" ns="0" title="BMT 10 2015" />
      <page pageid="13187" ns="0" title="BMT 10 2015/Seite 1" />
    </pages>
  </query>
</api>