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="Links_crosssection_inset.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="18" ns="6" title="File:08-10-07 1138 imagearray.jpg" />
      <page pageid="19" ns="6" title="File:08-10-07 1139 imagearray.jpg" />
      <page pageid="20" ns="6" title="File:08-10-07 1140 imagearray.jpg" />
      <page pageid="21" ns="6" title="File:08-10-07 1141 imagearray.jpg" />
      <page pageid="22" ns="6" title="File:08-10-07 1142 imagearray.jpg" />
      <page pageid="23" ns="6" title="File:08-10-07 1143 imagearray.jpg" />
      <page pageid="24" ns="6" title="File:08-10-07 1144 imagearray.jpg" />
      <page pageid="25" ns="6" title="File:08-10-07 1145 imagearray.jpg" />
      <page pageid="26" ns="6" title="File:08-10-07 1146 imagearray.jpg" />
      <page pageid="27" ns="6" title="File:08-10-07 1148 imagearray.jpg" />
    </pages>
  </query>
</api>