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>
    <querypage qpoffset="10" />
  </query-continue>
  <query>
    <querypage name="Ancientpages">
      <results>
        <page value="20150430125654" timestamp="2015-04-30T12:56:54Z" ns="0" title="アメリカ" />
        <page value="20150519040409" timestamp="2015-05-19T04:04:09Z" ns="0" title="イギリス" />
        <page value="20150613133210" timestamp="2015-06-13T13:32:10Z" ns="0" title="インド" />
        <page value="20150820165217" timestamp="2015-08-20T16:52:17Z" ns="0" title="韓国" />
        <page value="20150820165827" timestamp="2015-08-20T16:58:27Z" ns="0" title="ブラジル" />
        <page value="20150820165937" timestamp="2015-08-20T16:59:37Z" ns="0" title="ミャンマー" />
        <page value="20150831074436" timestamp="2015-08-31T07:44:36Z" ns="0" title="ドイツ" />
        <page value="20150831074532" timestamp="2015-08-31T07:45:32Z" ns="0" title="ベトナム" />
        <page value="20150831074709" timestamp="2015-08-31T07:47:09Z" ns="0" title="カンボジア" />
        <page value="20150831074743" timestamp="2015-08-31T07:47:43Z" ns="0" title="インドネシア" />
      </results>
    </querypage>
  </query>
</api>