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>
    <allpages gapcontinue="TAX_BREAKS_Associated_Articles" />
  </query-continue>
  <query>
    <pages>
      <page pageid="121691" ns="0" title="T-Mobile s Latest Entry In Its G-Series Of Android Phones And Tablets" contentmodel="wikitext" pagelanguage="es" touched="2017-06-01T13:59:40Z" lastrevid="421742" counter="24" length="2395" />
      <page pageid="121518" ns="0" title="T-Mobile s Latest Entry In The G-Series Of Android Phones And Tablets" contentmodel="wikitext" pagelanguage="es" touched="2017-06-01T13:58:51Z" lastrevid="421705" counter="23" length="2980" />
      <page pageid="113773" ns="0" title="T-mobile G1 Mobile Phone Review - that May Be Worth money" contentmodel="wikitext" pagelanguage="es" touched="2017-05-30T01:46:30Z" lastrevid="379600" counter="16" length="3350" new="" />
      <page pageid="110485" ns="0" title="T-shirts shirts: Look Great all day" contentmodel="wikitext" pagelanguage="es" touched="2017-05-29T03:23:43Z" lastrevid="362196" counter="10" length="5700" new="" />
    </pages>
  </query>
</api>