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|1540" />
  </query-continue>
  <query>
    <embeddedin>
      <ei pageid="1305" ns="0" title="Six String Nation" />
      <ei pageid="1319" ns="0" title="Research Resources" />
      <ei pageid="1436" ns="0" title="Template for a Page" />
      <ei pageid="1446" ns="0" title="Travel and Tourism:A Regional Geographic Perspective (CGG3O)" />
      <ei pageid="1466" ns="0" title="Victoria, British Columbia" />
      <ei pageid="1469" ns="0" title="Using Numbers in A Sentence" />
      <ei pageid="1487" ns="0" title="This Land is Your Land (Canadian Lyrics by The Travellers )" />
      <ei pageid="1493" ns="0" title="40 Hours of Community Service" />
      <ei pageid="1509" ns="0" title="Communication Skills" />
      <ei pageid="1523" ns="0" title="Slang from the 1920&#039;s" />
    </embeddedin>
  </query>
</api>