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>
    <allpages>
      <p pageid="4" ns="0" title="Building a model FAQ" />
      <p pageid="1067" ns="0" title="Building an installation package" />
      <p pageid="1090" ns="0" title="C++ generator for YANG data" />
      <p pageid="343" ns="0" title="ClLog.xml" />
      <p pageid="1092" ns="0" title="ClLogFilterSet" />
      <p pageid="7" ns="0" title="Command Line and environment variables FAQ" />
      <p pageid="1093" ns="0" title="Compilation of components Outside IDE" />
      <p pageid="1086" ns="0" title="Convert YANG to MIB model" />
      <p pageid="1074" ns="0" title="Cross compiler" />
      <p pageid="344" ns="0" title="Deadpages/Doc:Sdk 5.0/taeguide" />
    </allpages>
  </query>
  <query-continue>
    <allpages apcontinue="Dependencies" />
  </query-continue>
</api>