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="Baekje_02" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="16737" ns="0" title="B-52" />
      <p pageid="6001" ns="0" title="B-레코드" />
      <p pageid="19530" ns="0" title="BH건조물참고" />
      <p pageid="12813" ns="0" title="BLOCKBUSTER" />
      <p pageid="23210" ns="0" title="BL 만화의 변천사" />
      <p pageid="23031" ns="0" title="BL 만화의 변천사.lst" />
      <p pageid="23232" ns="0" title="BL만화의 역사.lst" />
      <p pageid="14725" ns="0" title="BRITNEY LIVE IN SEOUL 2017" />
      <p pageid="16752" ns="0" title="Bacardi" />
      <p pageid="28801" ns="0" title="Baekje 01" />
    </allpages>
  </query>
</api>