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="Basic_rules_when_dealing_with_leather|6624" />
  </query-continue>
  <query>
    <pages>
      <page pageid="6553" ns="0" title="Leather shoes" />
      <page pageid="6561" ns="0" title="Car leather" />
      <page pageid="6571" ns="0" title="Leather damages" />
      <page pageid="6575" ns="0" title="Leather care" />
      <page pageid="6579" ns="0" title="Leather quality" />
      <page pageid="6582" ns="0" title="Leather furniture" />
      <page pageid="6598" ns="0" title="Leather handbags" />
      <page pageid="6644" ns="0" title="Tanning leather" />
      <page pageid="6788" ns="0" title="Leather dye - Leather color - Leather colour" />
      <page pageid="7065" ns="0" title="Lavalina leather" />
    </pages>
  </query>
</api>