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"?>
    <allimages gaicontinue="2018crewsansnathannothuge.jpg" />
      <page pageid="2440" ns="6" title="File:09 W027 configuration.JPG" />
      <page pageid="3240" ns="6" title="File:196287 10150120373191252 610316251 6297669 6887321 n.jpg" />
      <page pageid="3327" ns="6" title="File:1992 ISSS shirt.jpg" />
      <page pageid="2712" ns="6" title="File:2000astros.jpg" />
      <page pageid="2127" ns="6" title="File:2009crew.JPG" />
      <page pageid="2136" ns="6" title="File:2009crewCROPPED.jpg" />
      <page pageid="2129" ns="6" title="File:2009crewSMALL.JPG" />
      <page pageid="2135" ns="6" title="File:2009crewSMALLER.JPG" />
      <page pageid="3534" ns="6" title="File:2016-10-28 16.00.56.jpg" />
      <page pageid="3581" ns="6" title="File:2018crewsansnathan.jpg" />