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="Maude_Overview" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="35" ns="0" title="Compiling Maude from source" />
      <p pageid="112" ns="0" title="Installation guidelines" />
      <p pageid="36" ns="0" title="List of the changes from 2.5 to 2.6" />
      <p pageid="2" ns="0" title="Main Page" />
      <p pageid="13" ns="0" title="Maude 2.6 Manual and Examples" />
      <p pageid="10" ns="0" title="Maude 2 Primer and Examples" />
      <p pageid="25" ns="0" title="Maude License Agreement" />
      <p pageid="61" ns="0" title="Maude Mailing Addresses and Lists" />
      <p pageid="7" ns="0" title="Maude Mailing Lists" />
      <p pageid="45" ns="0" title="Maude Manual and Examples" />
    </allpages>
  </query>
</api>