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="Compiling_uBoot_RaspberryPi" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="40" ns="0" title="BeagleBoneBlack Boot Process" />
      <p pageid="33" ns="0" title="BeagleBoneBlack Building Kernel" />
      <p pageid="44" ns="0" title="BeagleBoneBlack Cape Manager" />
      <p pageid="41" ns="0" title="BeagleBoneBlack Default uBoot Environment Variables" />
      <p pageid="45" ns="0" title="BeagleBoneBlack Disabling HDMI" />
      <p pageid="34" ns="0" title="BeagleBoneBlack IEEE802154 Microchip MRF24J40" />
      <p pageid="76" ns="0" title="BeagleBoneBlack Upgrading uBoot" />
      <p pageid="83" ns="0" title="Belkin WEMO Switch RT5350F" />
      <p pageid="47" ns="0" title="Budget 802.15.4 6LoWPAN Protocol Analyser using Wireshark" />
      <p pageid="78" ns="0" title="CC2650 SensorTag BuildYourOwnDevPack" />
    </allpages>
  </query>
</api>