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>
    <alllinks galcontinue="Barnesteeg" />
  </query-continue>
  <query>
    <pages>
      <page ns="0" title="Baanman, Heertje Cornelisz. - 2 mei 1660" missing="" />
      <page ns="0" title="Backer, Aefjen Lambertsdr. - 6 september 1676" missing="" />
      <page ns="0" title="Backer, Aefjen Olphertsdr. - 2 september 1696" missing="" />
      <page ns="0" title="Backer, Catharina Lambertsdr. - 1 januari 1687" missing="" />
      <page ns="0" title="Backer, Cornelia Lambertsdr. - 30 juni 1684" missing="" />
      <page pageid="4722" ns="0" title="Baangracht" />
      <page pageid="3410" ns="0" title="Baansteeg" />
      <page pageid="3551" ns="0" title="Bagijnestraat" />
      <page pageid="3069" ns="0" title="Bagijnnen lant" />
      <page pageid="4933" ns="0" title="Bank Kleine Zaken" />
    </pages>
  </query>
</api>