You are looking at the HTML representation of the XML format.
HTML is good for debugging, but probably is not suitable for your application.
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<?xml version="1.0"?>
<api>
  <query>
    <pages>
      <page pageid="6" ns="0" title="SMS Alarm/IO unit Building">
        <revisions>
          <rev xml:space="preserve">SMS Alarm building

[mailto:kimfmx@gmail.com Email me]</rev>
        </revisions>
      </page>
    </pages>
  </query>
</api>