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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
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<?xml version="1.0"?>
<api>
<query-continue>
<allfileusages gafcontinue="Golden-Sedum-In-Nursery-Pots.jpg|53" />
</query-continue>
<query>
<pages>
<page pageid="1" ns="0" title="Main Page" />
<page pageid="4" ns="0" title="Model Railroads in the Backyard" />
<page pageid="12" ns="0" title="Electric and Live Steam Power" />
<page pageid="24" ns="0" title="Don Herzog's "Plant of the Month"" />
<page pageid="26" ns="0" title="June, 2016: Elfin Thyme" />
<page pageid="40" ns="0" title="Garden Railway Manufacturers List" />
<page pageid="43" ns="0" title="Garden Railway Photography" />
<page pageid="79" ns="0" title="A Matter of Scale" />
</pages>
</query>
</api>