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="NIAGARA_MOON" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="90" ns="0" title="BAND WAGON" />
      <p pageid="527" ns="0" title="BEAUTIFUL LIFE (小松未歩歌曲)" />
      <p pageid="139" ns="0" title="EACH TIME" />
      <p pageid="142" ns="0" title="Each Time" />
      <p pageid="540" ns="0" title="FIRST LIGHT (松下誠专辑)" />
      <p pageid="93" ns="0" title="FOREVER YOUNG (吉田拓郎专辑)" />
      <p pageid="141" ns="0" title="FUN×4" />
      <p pageid="151" ns="0" title="GO! GO! NIAGARA" />
      <p pageid="155" ns="0" title="LET&#039;S ONDO AGAIN" />
      <p pageid="152" ns="0" title="NIAGARA CALENDAR" />
    </allpages>
  </query>
</api>