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>
    <alltransclusions gatcontinue="Blackrazor_Guild|3047" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1784" ns="0" title="Blackrazor Guild" />
      <page pageid="1807" ns="0" title="Alston Rexious" />
      <page pageid="1811" ns="0" title="Tempest" />
      <page pageid="2366" ns="0" title="Blackrazor Guildhall" />
      <page pageid="2562" ns="0" title="Swamphold" />
      <page pageid="2609" ns="0" title="The Sea Razor" />
      <page pageid="2812" ns="0" title="Redshirts" />
      <page pageid="2927" ns="0" title="Blackrazor Guild, Roster" />
      <page pageid="3044" ns="0" title="Blackrazor House, Seltaren" />
      <page pageid="3046" ns="0" title="A History of the Blackrazor Guild" />
    </pages>
  </query>
</api>