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>
    <alltransclusions gatcontinue="Download|4529" />
  </query-continue>
  <query>
    <pages>
      <page pageid="2529" ns="0" title="EM.Tempo Example Project: Fields Near a Ship" />
      <page pageid="2530" ns="0" title="EM.Tempo Project Gallery" />
      <page pageid="4039" ns="10" title="Template:Picasso Details" />
      <page pageid="4449" ns="0" title="EM.Tempo Tutorial Lesson 1: Analyzing a Center-Fed Resonant Dipole Antenna" />
      <page pageid="4512" ns="0" title="EM.Tempo Tutorial Lesson 9: Modeling Wave Propagation in Left-Handed Metamaterials" />
      <page pageid="4516" ns="0" title="EM.Tempo Tutorial Lesson 11: Modeling Wave Propagation in Left-Handed Metamaterials" />
      <page pageid="4526" ns="0" title="Digital Tutorial Lesson 3: Building a Shift Register Using D Flip-Flops" />
      <page pageid="4527" ns="0" title="Digital Tutorial Lesson 4: Building a Binary Counter Using JK Flip-Flops" />
      <page pageid="4576" ns="0" title="EM.Picasso Tutorial Lesson 2: Analyzing a CPW-Fed Folded Slot Antenna" />
      <page pageid="4577" ns="0" title="EM.Picasso Tutorial Lesson 3: Analyzing a Planar Microstrip Filter" />
    </pages>
  </query>
</api>