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>
    <allredirects garcontinue="Frederick_W._Clarke_(ca._1870-_),_Architect|1308" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1184" ns="0" title="Anderson, Frank" />
      <page pageid="1192" ns="0" title="Dean Edwin Arter (1927-1995), Architect)" />
      <page pageid="1286" ns="0" title="Frederick L. Burrell, Architect" />
      <page pageid="1313" ns="0" title="Charles Cleves (ca. 1846- ), Architect" />
      <page pageid="1701" ns="0" title="E. H. Herminghaus (1891-1965), Landscape Architect" />
      <page pageid="1819" ns="0" title="Chas Kirchhoff, Jr., Architect" />
      <page pageid="1852" ns="0" title="Frederick O. Kunz, Architect" />
      <page pageid="1883" ns="0" title="F. C. Ledebrink, Architect" />
      <page pageid="1884" ns="0" title="FCLedebrinkArchitect 20160126" />
      <page pageid="1923" ns="0" title="E. J. Messmore (1865- ), Architect" />
    </pages>
  </query>
</api>