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>
    <allimages gaicontinue="Ballscrews_rev_b.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="102" ns="6" title="File:175324 10151186401887208 773120602 o.jpg" />
      <page pageid="103" ns="6" title="File:196008 10150131320349630 502869629 6421175 5964951 n.jpg" />
      <page pageid="104" ns="6" title="File:196696 10150130507994630 502869629 6415083 64160 n.jpg" />
      <page pageid="105" ns="6" title="File:197182 10150134129504630 502869629 6446983 1310890 n.jpg" />
      <page pageid="37" ns="6" title="File:24V power supply.jpg" />
      <page pageid="36" ns="6" title="File:24V to 5V stepdown converter.jpg" />
      <page pageid="80" ns="6" title="File:4210 10inch drill press manual.pdf" />
      <page pageid="169" ns="6" title="File:Alias.png" />
      <page pageid="176" ns="6" title="File:Annecy-bern.png" />
      <page pageid="107" ns="6" title="File:Asus-static-route.png" />
    </pages>
  </query>
</api>