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="业务公式:删除操作" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="2895" ns="0" title="Json数据接口使用说明" />
      <p pageid="56" ns="0" title="Manager" />
      <p pageid="159" ns="0" title="Mediawiki常用语法" />
      <p pageid="3025" ns="0" title="OpenAPI接口使用说明" />
      <p pageid="2810" ns="0" title="PDA图片资源包配置" />
      <p pageid="2558" ns="0" title="Subtotal函数" />
      <p pageid="2735" ns="0" title="Text函数" />
      <p pageid="3048" ns="0" title="“云表支付”业务逻辑设计" />
      <p pageid="84" ns="0" title="下拉列表的进阶" />
      <p pageid="545" ns="0" title="业务公式:事件" />
    </allpages>
  </query>
</api>