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>
    <allfileusages gafcontinue="B2MAN_Fig100.png|7992" />
  </query-continue>
  <query>
    <pages>
      <page pageid="4015" ns="0" title="B2.Spice A/D-RF.Spice" />
      <page pageid="4324" ns="0" title="An Overview of Digital Circuit Simulation" />
      <page pageid="4430" ns="0" title="Navigating the Visual Interface: Workshop &amp; Toolbox" />
      <page pageid="4543" ns="0" title="Analog Tutorial Lesson 1: A Simple Voltage Divider Circuit" />
      <page pageid="4545" ns="0" title="Analog Tutorial Lesson 3: Analyzing a Basic Bipolar Junction Transistor Circuit" />
      <page pageid="4553" ns="0" title="Analog Tutorial Lesson 11: Creating a Reusable Parameterized Subcircuit Device" />
      <page pageid="5294" ns="0" title="The Old Version of Digital Circuit Simulation on B2.Spice Site" />
      <page pageid="8009" ns="0" title="Basic Tutorial Lesson 1: A Simple Voltage Divider Circuit" />
      <page pageid="8011" ns="0" title="Basic Tutorial Lesson 3: Analyzing a Basic Bipolar Junction Transistor Circuit" />
      <page pageid="8022" ns="0" title="Basic Tutorial Lesson 14: Creating a Reusable Parameterized Subcircuit Device" />
    </pages>
  </query>
</api>