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>
    <embeddedin>
      <ei pageid="142" ns="0" title="3-dot sight" />
      <ei pageid="231" ns="0" title="90 rounder" />
      <ei pageid="269" ns="0" title="AO-27 rifle" />
      <ei pageid="271" ns="0" title="AO-46 personal defence weapon" />
      <ei pageid="307" ns="0" title="Americans for Democratic Action" />
      <ei pageid="313" ns="0" title="Ammunition belt" />
      <ei pageid="385" ns="0" title="Authorization to Carry" />
      <ei pageid="420" ns="0" title="Bandolier" />
      <ei pageid="430" ns="0" title="Battle rifle" />
      <ei pageid="432" ns="0" title="Bayonet lug" />
    </embeddedin>
  </query>
  <query-continue>
    <embeddedin eicontinue="10|Stub|455" />
  </query-continue>
</api>