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="Choanoflagellate|177" />
  </query-continue>
  <query>
    <pages>
      <page pageid="4" ns="0" title="Phosphatase classification" />
      <page pageid="12" ns="0" title="Phosphatase Family FCP" />
      <page pageid="13" ns="0" title="Phosphatase Subfamily FCP1" />
      <page pageid="14" ns="0" title="Phosphatase Subfamily SCP" />
      <page pageid="25" ns="0" title="Phosphatase Subfamily CTDSPL2" />
      <page pageid="26" ns="0" title="Phosphatase Subfamily UBLCP1" />
      <page pageid="112" ns="0" title="Phosphatase Superfamily RTR1" />
      <page pageid="115" ns="0" title="Phosphatase Family RTR1" />
      <page pageid="226" ns="0" title="Phosphatase Subfamily RTR1" />
      <page pageid="227" ns="0" title="Phosphatase Fold RTR1" />
    </pages>
  </query>
</api>