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="Beta" />
  </query-continue>
  <query>
    <pages>
      <page pageid="6147" ns="0" title="B-Netz" />
      <page pageid="4191" ns="0" title="BALDR Weather Sensor Telemetry" />
      <page pageid="3644" ns="0" title="BMW Key-Code signal" />
      <page pageid="3708" ns="0" title="BPC" />
      <page pageid="4081" ns="0" title="BPM" />
      <page pageid="153" ns="0" title="BR-6028" />
      <page pageid="7750" ns="0" title="Baofeng GMSK" />
      <page pageid="3615" ns="0" title="Beeper" />
      <page pageid="5107" ns="0" title="Beeping morse-like signal found on 599p99 MHz" />
      <page pageid="5027" ns="0" title="Best Recording Practices" />
    </pages>
  </query>
</api>