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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>
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    <querypage qpoffset="10" />
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    <querypage name="Ancientpages">
      <results>
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        <page value="20090924224048" timestamp="2009-09-24T22:40:48Z" ns="0" title="How to install Gnome 2.26 in Salix 13.0" />
        <page value="20090925144326" timestamp="2009-09-25T14:43:26Z" ns="0" title="Flash doesn&#039;t work in opera or midori" />
        <page value="20091022122118" timestamp="2009-10-22T12:21:18Z" ns="0" title="News" />
        <page value="20091022141511" timestamp="2009-10-22T14:15:11Z" ns="0" title="Main menu" />
        <page value="20091027142451" timestamp="2009-10-27T14:24:51Z" ns="0" title="Wiki toolbox" />
        <page value="20091111233201" timestamp="2009-11-11T23:32:01Z" ns="0" title="GConf schemas and packaging" />
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        <page value="20091202152553" timestamp="2009-12-02T15:25:53Z" ns="0" title="How to install KDE 4" />
        <page value="20100128220125" timestamp="2010-01-28T22:01:25Z" ns="0" title="Sandbox" />
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  </query>
</api>