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="Rosalie_Janus|4426" />
  </query-continue>
  <query>
    <pages>
      <page pageid="18" ns="4" title="MahouMUSH:About" />
      <page pageid="19" ns="4" title="MahouMUSH:General disclaimer" />
      <page pageid="20" ns="4" title="MahouMUSH:Privacy policy" />
      <page pageid="1364" ns="0" title="Puzzle Peices (Takashi Agera)" />
      <page pageid="1475" ns="0" title="Not Much of a Legacy" />
      <page pageid="3185" ns="0" title="Earth Court Frat House - Roof" />
      <page pageid="3187" ns="0" title="The Dark Kingdom" />
      <page pageid="4367" ns="0" title="Fate Testarossa" />
      <page pageid="4461" ns="0" title="Maboroshi no Manako" />
      <page pageid="4558" ns="0" title="List of Ficitional Media" />
    </pages>
  </query>
</api>