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="Barium|466" />
  </query-continue>
  <query>
    <pages>
      <page pageid="41" ns="0" title="Metamaterial" />
      <page pageid="256" ns="0" title="Gemstone metamaterial on chip factory" />
      <page pageid="618" ns="0" title="Multi criterion file system" />
      <page pageid="843" ns="0" title="Examples of diamondoid molecular machine elements" />
      <page pageid="979" ns="0" title="Bottom scale assembly lines in gem-gum factories" />
      <page pageid="1046" ns="0" title="Thermodynamic means" />
      <page pageid="1097" ns="0" title="Energy recuperation" />
      <page pageid="1595" ns="0" title="Sitemap" />
      <page pageid="1817" ns="0" title="Space elevators" />
    </pages>
  </query>
</api>