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 apcontinue="Better_Buying_Power_2.0" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="457" ns="0" title="Bad Debts" />
      <p pageid="1611" ns="0" title="Bad Debts Query" />
      <p pageid="287" ns="0" title="Basic Ordering Agreement" />
      <p pageid="458" ns="0" title="Basic Research" />
      <p pageid="2275" ns="0" title="Basis of Estimate" />
      <p pageid="829" ns="0" title="Benchmark Compensation Amount" />
      <p pageid="2391" ns="0" title="Bereavement Leave Policy" />
      <p pageid="2285" ns="0" title="Berry Amendment" />
      <p pageid="459" ns="0" title="Best Value" />
      <p pageid="1782" ns="0" title="Better Buying Power 1.0" />
    </allpages>
  </query>
</api>