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"?>
    <allfileusages gafcontinue="C919大型客机首架机机头部段在成都下线.jpg|374373" />
      <page pageid="374373" ns="0" title="C919大型客机全纪录" />