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>
    <alllinks galcontinue="Rewriting_Logic" />
  </query-continue>
  <query>
    <pages>
      <page pageid="112" ns="0" title="Installation guidelines" />
      <page pageid="13" ns="0" title="Maude 2.6 Manual and Examples" />
      <page pageid="25" ns="0" title="Maude License Agreement" />
      <page pageid="61" ns="0" title="Maude Mailing Addresses and Lists" />
      <page pageid="7" ns="0" title="Maude Mailing Lists" />
      <page pageid="45" ns="0" title="Maude Manual and Examples" />
      <page pageid="4" ns="0" title="Maude Overview" />
      <page pageid="23" ns="0" title="Maude Tools" />
      <page pageid="56" ns="0" title="Maude Tools: Maude-NPA" />
      <page pageid="30" ns="0" title="Maude download and installation" />
    </pages>
  </query>
</api>