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>
    <allpages apcontinue="Baby_nex" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="6200" ns="0" title="Baby Blue Dragon" />
      <p pageid="5858" ns="0" title="Baby basilisk" />
      <p pageid="3857" ns="0" title="Baby black dragon" />
      <p pageid="715" ns="0" title="Baby blue dragon" />
      <p pageid="5456" ns="0" title="Baby corp" />
      <p pageid="4970" ns="0" title="Baby corporeal beast" />
      <p pageid="3808" ns="0" title="Baby dragon" />
      <p pageid="3858" ns="0" title="Baby dragons" />
      <p pageid="595" ns="0" title="Baby jad" />
      <p pageid="5859" ns="0" title="Baby kurask" />
    </allpages>
  </query>
</api>