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="施志剛_作品圖片:妙景山川" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="1" ns="0" title="Main Page" />
      <p pageid="104" ns="0" title="愛藝術 關於我們" />
      <p pageid="15" ns="0" title="新聞中心" />
      <p pageid="31" ns="0" title="施志剛" />
      <p pageid="55" ns="0" title="施志剛 作品圖片" />
      <p pageid="68" ns="0" title="施志剛 作品圖片:人物" />
      <p pageid="65" ns="0" title="施志剛 作品圖片:千年老伴" />
      <p pageid="86" ns="0" title="施志剛 作品圖片:去邪" />
      <p pageid="66" ns="0" title="施志剛 作品圖片:地久天長" />
      <p pageid="69" ns="0" title="施志剛 作品圖片:天賜行久" />
    </allpages>
  </query>
</api>