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="Center_for_Systemic_Peace" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="27" ns="0" title="BGR data" />
      <p pageid="26" ns="0" title="BP data" />
      <p pageid="149" ns="0" title="Balance of Payments and International Investment Position statistics (BoP/IIP) from IMF" />
      <p pageid="147" ns="0" title="Bank for International Settlements (BIS)" />
      <p pageid="290" ns="0" title="Barro-Lee" />
      <p pageid="1422" ns="0" title="Basic Functionalities" />
      <p pageid="1632" ns="0" title="Basic Report (Download)" />
      <p pageid="1433" ns="0" title="Basic Report for Countries/Regions or Groupings" />
      <p pageid="78" ns="0" title="CIA World Factbook" />
      <p pageid="212" ns="0" title="Carbon Emissions Data (CDIAC)" />
    </allpages>
  </query>
</api>