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="CddOldDocumentation" />
  </query-continue>
  <query>
    <pages>
      <page ns="0" title="BOOLEAN" missing="" />
      <page pageid="2041" ns="0" title="Back to once approach" />
      <page pageid="1335" ns="0" title="Build tool" />
      <page pageid="1844" ns="0" title="Building a delivery" />
      <page pageid="1744" ns="0" title="Byte Code" />
      <page pageid="2286" ns="0" title="CDDHowtoRollARelease" />
      <page pageid="2278" ns="0" title="CDD Common Problems" />
      <page pageid="2129" ns="0" title="Catcall checkpoints" />
      <page pageid="1846" ns="0" title="CddBranch" />
      <page pageid="2304" ns="0" title="CddBranchInternal" />
    </pages>
  </query>
</api>