You are looking at the HTML representation of the XML format.
HTML is good for debugging, but probably is not suitable for your application.
See complete documentation, or API help for more information.
<?xml version="1.0"?>
<api>
  <query-continue>
    <categorymembers gcmcontinue="page|303137310a3137313a20535452494e47205448454f5259|7848" />
  </query-continue>
  <query>
    <pages>
      <page pageid="308" ns="0" title="21: Kepler" touched="2017-12-15T15:14:11Z" lastrevid="141573" counter="65082" length="3132" />
      <page pageid="3398" ns="0" title="45: Schrodinger" touched="2017-12-15T15:14:11Z" lastrevid="148310" counter="59501" length="5679" />
      <page pageid="3465" ns="0" title="54: Science" touched="2017-12-15T15:14:11Z" lastrevid="142203" counter="136860" length="6055" />
      <page pageid="314" ns="0" title="69: Pillow Talk" touched="2017-12-15T15:14:11Z" lastrevid="120184" counter="40988" length="1185" />
      <page pageid="3497" ns="0" title="89: Gravitational Mass" touched="2017-12-15T15:14:11Z" lastrevid="143239" counter="51925" length="2798" />
      <page pageid="338" ns="0" title="103: Moral Relativity" touched="2017-12-15T15:14:11Z" lastrevid="143770" counter="48301" length="2046" />
      <page pageid="3793" ns="0" title="123: Centrifugal Force" touched="2017-12-15T15:14:11Z" lastrevid="143889" counter="97087" length="5934" />
      <page pageid="363" ns="0" title="135: Substitute" touched="2017-12-15T15:14:11Z" lastrevid="144370" counter="72186" length="4450" />
      <page pageid="6708" ns="0" title="154: Beliefs" touched="2017-12-15T15:14:11Z" lastrevid="144701" counter="53738" length="4214" />
      <page pageid="553" ns="0" title="162: Angular Momentum" touched="2017-12-15T15:14:11Z" lastrevid="147715" counter="69943" length="3378" />
    </pages>
  </query>
</api>