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="Develop_GPF_Checklist" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="1247" ns="0" title="Bakinam Essawy" />
      <p pageid="134" ns="0" title="Cedric David" />
      <p pageid="1040" ns="0" title="Cedric David should make software executable by others" />
      <p pageid="13" ns="0" title="Chris Duffy" />
      <p pageid="12" ns="0" title="Chris Mattmann" />
      <p pageid="1242" ns="0" title="Collect submissions" />
      <p pageid="1271" ns="0" title="Create format and guidelines" />
      <p pageid="1258" ns="0" title="Criteria of documenting quality in geoscience" />
      <p pageid="1237" ns="0" title="Define the goals of a GPF" />
      <p pageid="1238" ns="0" title="Describe the structure of a GPF" />
    </allpages>
  </query>
</api>