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="LC_CARDLIST_TBODY_SET2_Black" />
  </query-continue>
  <query>
    <pages>
      <page pageid="8" ns="10" title="テンプレート:LC CARD" />
      <page pageid="287" ns="10" title="テンプレート:LC CARD2" />
      <page pageid="331" ns="10" title="テンプレート:LC CARDLIST TBODY PR" />
      <page pageid="330" ns="10" title="テンプレート:LC CARDLIST TBODY SET1 ALL" />
      <page pageid="328" ns="10" title="テンプレート:LC CARDLIST TBODY SET1 Black" />
      <page pageid="329" ns="10" title="テンプレート:LC CARDLIST TBODY SET1 Blue" />
      <page pageid="326" ns="10" title="テンプレート:LC CARDLIST TBODY SET1 Orange" />
      <page pageid="327" ns="10" title="テンプレート:LC CARDLIST TBODY SET1 Purple" />
      <page pageid="325" ns="10" title="テンプレート:LC CARDLIST TBODY SET1 White" />
      <page pageid="332" ns="10" title="テンプレート:LC CARDLIST TBODY SET2 ALL" />
    </pages>
  </query>
</api>