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>
    <alltransclusions gatcontinue="News_topic" />
  </query-continue>
  <query>
    <pages>
      <page pageid="747" ns="10" title="Template:Changelog rockpi4 kernel" />
      <page pageid="612" ns="10" title="Template:Community updates" />
      <page pageid="1349" ns="10" title="Template:Device-tree-overlays-rock3" />
      <page pageid="7" ns="10" title="Template:Languages" />
      <page pageid="174" ns="10" title="Template:News begin" />
      <page pageid="183" ns="10" title="Template:News brief begin" />
      <page pageid="184" ns="10" title="Template:News brief end" />
      <page pageid="185" ns="10" title="Template:News brief header" />
      <page pageid="175" ns="10" title="Template:News end" />
      <page pageid="173" ns="10" title="Template:News pic" />
    </pages>
  </query>
</api>