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>
    <pages>
      <page pageid="69772" ns="0" title="Incertae Sedis (Coraebini)" />
      <page pageid="487704" ns="0" title="Edaphosoma janetscheki" />
      <page pageid="511760" ns="0" title="Chrysamoebaceae" />
      <page pageid="579599" ns="0" title="Prunus domestica subsp. italica" />
      <page pageid="89044" ns="0" title="Discapseudes mackiei" />
      <page pageid="610990" ns="0" title="Austrophthiracarus sarawaki" />
      <page pageid="602208" ns="0" title="Teratopsocus" />
      <page pageid="451435" ns="0" title="Vipera albizona" />
      <page pageid="621916" ns="0" title="Petrophila aeglesalis" />
      <page pageid="565255" ns="0" title="Calosoma chlorostictum" />
    </pages>
  </query>
</api>