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>
    <recentchanges>
      <rc type="edit" ns="0" title="Mongodb 源码阅读笔记" rcid="547" pageid="68" revid="544" old_revid="543" timestamp="2017-05-26T03:36:32Z" />
      <rc type="edit" ns="0" title="Mongodb 源码阅读笔记" rcid="546" pageid="68" revid="543" old_revid="542" timestamp="2017-05-25T03:25:23Z" />
      <rc type="edit" ns="0" title="Mongodb 源码阅读笔记" rcid="545" pageid="68" revid="542" old_revid="541" timestamp="2017-05-25T03:05:45Z" />
      <rc type="edit" ns="0" title="Mongodb 源码阅读笔记" rcid="544" pageid="68" revid="541" old_revid="540" timestamp="2017-05-24T07:42:33Z" />
      <rc type="edit" ns="0" title="Mongodb 源码阅读笔记" rcid="543" pageid="68" revid="540" old_revid="539" timestamp="2017-05-24T07:32:26Z" />
      <rc type="edit" ns="0" title="Mongodb 源码阅读笔记" rcid="542" pageid="68" revid="539" old_revid="538" timestamp="2017-05-24T07:23:44Z" />
      <rc type="new" ns="0" title="Mongodb 源码阅读笔记" rcid="541" pageid="68" revid="538" old_revid="0" timestamp="2017-05-24T07:09:47Z" />
      <rc type="edit" ns="0" title="Mongodb 存储引擎笔记" rcid="540" pageid="66" revid="537" old_revid="535" timestamp="2017-05-23T07:28:12Z" />
      <rc type="log" ns="6" title="文件:Mongodb lock op.png" rcid="539" pageid="0" revid="0" old_revid="0" timestamp="2017-05-23T07:27:53Z" />
      <rc type="edit" ns="0" title="Mongodb 存储引擎笔记" rcid="538" pageid="66" revid="535" old_revid="534" timestamp="2017-05-23T06:56:47Z" />
    </recentchanges>
  </query>
  <query-continue>
    <recentchanges rcstart="2017-05-23T06:56:19Z" />
  </query-continue>
</api>