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 arcontinue="BB:ステージ４（１Ｃ４）|2188" />
  </query-continue>
  <query>
    <allredirects>
      <r fromid="2168" ns="0" title="BB:AOL CUP -Maximum Attack- (E)" />
      <r fromid="2294" ns="0" title="BB:Central Dome Fire Swirl (Online Version) (V2)" />
      <r fromid="1888" ns="0" title="BB:Magnitude of Metal" />
      <r fromid="2164" ns="0" title="BB:Maximum Attack 2 (E)" />
      <r fromid="1963" ns="0" title="BB:Seat of The Heart (Offline Version)" />
      <r fromid="2296" ns="0" title="BB:Seat of the Heart (Offline Version)" />
      <r fromid="2185" ns="0" title="BB:ステージ１（１Ｃ１）" />
      <r fromid="2184" ns="0" title="BB:ステージ１（１ｃ１）" />
      <r fromid="2186" ns="0" title="BB:ステージ２（１Ｃ２）" />
      <r fromid="2187" ns="0" title="BB:ステージ３（１Ｃ３）" />
    </allredirects>
  </query>
</api>