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 gapcontinue="OpenLDAP_directory_set-up" />
  </query-continue>
  <query>
    <pages>
      <page pageid="293" ns="0" title="Libvirt external snapshot with GlusterFS" />
      <page pageid="398" ns="0" title="Load Balancer as a Service (LBaaS): OpenLDAP directory data organisation">
        <flagged stable_revid="5376" level="0" level_text="stable" />
      </page>
      <page pageid="1" ns="0" title="Main Page">
        <flagged stable_revid="4529" level="1" level_text="quality" />
      </page>
      <page pageid="258" ns="0" title="Managing VMs in extra networks" />
      <page pageid="252" ns="0" title="Manually adding a new bridge" />
      <page pageid="287" ns="0" title="Mirror Server" />
      <page pageid="132" ns="0" title="Modularisation">
        <flagged stable_revid="4456" level="0" level_text="stable" />
      </page>
      <page pageid="115" ns="0" title="Multi-Node Installation" />
      <page pageid="27" ns="0" title="OpenLDAP Services: Backup" />
      <page pageid="111" ns="0" title="OpenLDAP directory data organisation" />
    </pages>
  </query>
</api>