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>
    <allfileusages gafcontinue="Ball_State.png|12052" />
  </query-continue>
  <query>
    <pages>
      <page pageid="2108" ns="0" title="Ball State" />
      <page pageid="4678" ns="0" title="Baldwin Wallace" />
      <page pageid="4730" ns="0" title="Babson" />
      <page pageid="5292" ns="0" title="Bacone" />
      <page pageid="5535" ns="0" title="Baker" />
      <page pageid="11831" ns="0" title="1978 NCAA Division III Playoffs" />
      <page pageid="12043" ns="0" title="1981 Mid-American Conference Men&#039;s Basketball" />
      <page pageid="12044" ns="0" title="1982 Mid-American Conference Men&#039;s Basketball" />
      <page pageid="12048" ns="0" title="1986 Mid-American Conference Men&#039;s Basketball" />
      <page pageid="12051" ns="0" title="1989 Mid-American Conference Men&#039;s Basketball" />
    </pages>
  </query>
</api>