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="Ceph_Object_Zone_Create" />
  </query-continue>
  <query>
    <pages>
      <page pageid="2695" ns="0" title="Backup Policies" />
      <page pageid="2741" ns="0" title="Bare-metal Install" />
      <page pageid="2708" ns="0" title="Block Storage Provisioning" />
      <page pageid="791" ns="0" title="CIFS Access User" />
      <page pageid="2726" ns="0" title="CLI Guide Overview" />
      <page pageid="2701" ns="0" title="Call-home/Alert Management" />
      <page pageid="2692" ns="0" title="Call-home / Alerting" />
      <page pageid="3175" ns="0" title="Ceph Filesystem Create" />
      <page pageid="1863" ns="0" title="Ceph Multi OSD Create" />
      <page pageid="2576" ns="0" title="Ceph OSD Delete" />
    </pages>
  </query>
</api>