Geography Markup Language

Geography Markup Language is a xml format created in 2000.

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The Geography Markup Language (GML) is the XML grammar defined by the Open Geospatial Consortium (OGC) to express geographical features. GML serves as a modeling language for geographic systems as well as an open interchange format for geographic transactions on the Internet. Key to GML's utility is its ability to integrate all forms of geographic information, including not only conventional "vector" or discrete objects, but coverages (see also GMLJP2) and sensor data.. Read more on Wikipedia...

Geography Markup Language Wikipedia page
Geography Markup Language first developed in Open Geospatial Consortium
See also: (3 related languages)XML, RDF, KML

Example 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>