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="Configuring_TCP_Time-Wait_Vector_Management" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1126" ns="0" title="BOOTP" />
      <page pageid="778" ns="0" title="BOOTP Client" />
      <page pageid="332" ns="0" title="BOOTP Relay Agent" />
      <page pageid="24" ns="0" title="Before Running the Code" />
      <page pageid="19" ns="0" title="Building the Library" />
      <page pageid="474" ns="0" title="Checksum and TCP Segmentation Offloading" />
      <page pageid="18" ns="0" title="Compile Time Macros" />
      <page pageid="380" ns="0" title="Configuring IP Forwarding and IP Fragmentation" />
      <page pageid="767" ns="0" title="Configuring Internal Socket Management" />
      <page pageid="1058" ns="0" title="Configuring TCP Congestion Avoidance Algorithm" />
    </pages>
  </query>
</api>