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>
    <links plcontinue="1|0|CLOCKSS:_Extracting_Triggered_Content" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1" ns="0" title="Main Page">
        <links>
          <pl ns="0" title="3) Organizational Infrastructure" />
          <pl ns="0" title="4) Digital Object Management" />
          <pl ns="0" title="5) Infrastructure and Security Risk Management" />
          <pl ns="0" title="CLOCKSS: Access Policy" />
          <pl ns="0" title="CLOCKSS: Box Operations" />
          <pl ns="0" title="CLOCKSS: Budget and Planning Process" />
          <pl ns="0" title="CLOCKSS: Business History" />
          <pl ns="0" title="CLOCKSS: Business Plan Overview" />
          <pl ns="0" title="CLOCKSS: Collection Development" />
          <pl ns="0" title="CLOCKSS: Designated Community" />
        </links>
      </page>
    </pages>
  </query>
</api>