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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="Figure_11._New_Zealand_soldiers,_US_Marines_and_hospital_staff,_carrying_out_rescue_work._Reference_Nelson_family_archive.jpg" />
  </query-continue>
  <query>
    <pages>
      <page pageid="163" ns="6" title="File:Aerial View Silverstream (Part showing Manor&#039;s Park) ARCH71770.JPG" />
      <page pageid="118" ns="6" title="File:Alexander COWIE.png" />
      <page pageid="106" ns="6" title="File:CUBA1.jpg" />
      <page pageid="101" ns="6" title="File:Centro01.jpg" />
      <page pageid="116" ns="6" title="File:Edmund Hillary.png" />
      <page pageid="145" ns="6" title="File:Figure 1. Interior of a &#039;straight-seater&#039;. -Photo courtesy Benedict Le Vay, 2013-.jpg">
        <duplicatefiles>
          <df name="Figure_1._Interior_of_a_&#039;straight-seater&#039;._Reference_Photo_courtesy_Benedict_Le_Vay,_2013.jpg" user="Jennie Henton" timestamp="2017-01-06T00:58:09Z" />
        </duplicatefiles>
      </page>
      <page pageid="146" ns="6" title="File:Figure 1. Interior of a &#039;straight-seater&#039;. Reference Photo courtesy Benedict Le Vay, 2013.jpg">
        <duplicatefiles>
          <df name="Figure_1._Interior_of_a_&#039;straight-seater&#039;._-Photo_courtesy_Benedict_Le_Vay,_2013-.jpg" user="Jennie Henton" timestamp="2017-01-06T00:56:19Z" />
        </duplicatefiles>
      </page>
      <page pageid="128" ns="6" title="File:Figure 1. The Recreation Ground Lower Hutt pre 1934 showing the pavilion. -Ref. Hutt City Council Archives, Arch 39114, Hutt Rec-.jpg" />
      <page pageid="155" ns="6" title="File:Figure 10. The remains of the roof and sides of the first carriage. Reference Nelson family archive.jpg" />
      <page pageid="138" ns="6" title="File:Figure 10. The smoking ruins of the Grandstand, 30 September 1998. Ref. Parks and gardens, PL12-3-HR-1 4, Hutt City Council Archives.jpg" />
    </pages>
  </query>
</api>