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="CSS|1538" />
  </query-continue>
  <query>
    <pages>
      <page pageid="672" ns="0" title="XHTML" />
      <page pageid="675" ns="0" title="心智图" />
      <page pageid="704" ns="0" title="层叠样式表" />
      <page pageid="950" ns="0" title="Safari" />
      <page pageid="1095" ns="14" title="分类:W3C" />
      <page pageid="1168" ns="12" title="帮助:Skin/zh" />
      <page pageid="1272" ns="0" title="滑动门" />
      <page pageid="1508" ns="0" title="reflow" />
      <page pageid="1516" ns="0" title="IE6下PNG-24位图片问题集合" />
      <page pageid="1525" ns="0" title="CSS选择符" />
    </pages>
  </query>
</api>