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>
    <embeddedin eicontinue="10|Stub|1713" />
  </query-continue>
  <query>
    <embeddedin>
      <ei pageid="1400" ns="0" title="Skin Two Clothing" />
      <ei pageid="1654" ns="0" title="Twist My Rubber Arm" />
      <ei pageid="1656" ns="0" title="Faszination Latex" />
      <ei pageid="1657" ns="0" title="Inner Sanctum" />
      <ei pageid="1660" ns="0" title="Silter latex store" />
      <ei pageid="1666" ns="0" title="Chateau Sauble" />
      <ei pageid="1668" ns="0" title="Futurefetish" />
      <ei pageid="1692" ns="0" title="Silicone oil" />
      <ei pageid="1693" ns="0" title="Dressing aid" />
      <ei pageid="1703" ns="0" title="Body bag" />
    </embeddedin>
  </query>
</api>