Geography Markup Language is a historical xml format created in 2000.

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Example code from Wikipedia:

<PhotoCollection xmlns="http://www.myphotos.org" xmlns:gml="http://www.opengis.net/gml"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
      xsi:schemaLocation="http://www.myphotos.org
      MyGoodPhotos.xsd">
     <items>
         <Item>
             <name>Lynn Valley</name>
             <description>A shot of the falls from the suspension bridge</description>
             <where>North Vancouver</where>
             <position>
                 <gml:Point srsDimension="2" srsName="http://www.opengis.net/def/crs/EPSG/0/4326">
                     <gml:pos>49.40 -123.26</gml:pos>
                 </gml:Point>
             </position>
         </Item>
     </items>
 </PhotoCollection>
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Last updated February 11th, 2019