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>
    <allredirects garcontinue="Benito_Pablo_Juárez_and_Adoption" />
  </query-continue>
  <query>
    <pages>
      <page pageid="5072" ns="0" title="Baiteke and Adoption (under Kiribati)" />
      <page pageid="985" ns="0" title="Barbara La Marr and Adoption" />
      <page pageid="1381" ns="0" title="Barbara Strozzi and Adoption" />
      <page pageid="546" ns="0" title="Barbara Walters and Adoption" />
      <page pageid="893" ns="0" title="Barry Evans and Adoption" />
      <page pageid="5073" ns="0" title="Basavis and Adoption (under Devadasi)" />
      <page pageid="5996" ns="0" title="Bauro and Adoption (under Kiribati)" />
      <page pageid="778" ns="0" title="Bede, the Venerable and Adoption" />
      <page pageid="756" ns="0" title="Ben Andrews and Adoption" />
      <page pageid="547" ns="0" title="Ben Stein and Adoption" />
    </pages>
  </query>
</api>