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    <!-- Example description http://www.schemacentral.com/sc/niem30/e-ns65_Curve.html -->
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        <EX_BoundingPolygon xmlns="http://www.isotc211.org/2005/gmd">
        <!-- The LAT, LON coordinates of a point.  The "srsName" describes the coordinate system -->
            <polygon>
                <gml:Curve gml:id="CurveId">
                    <gml:segments>
                        <!-- An Arc is an arc string with only one arc unit, i.e. three control points including the start and end point. As arc is an arc string consisting of a single arc, the attribute "numArc" is fixed to "1".-->
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                            <!-- arc interim point -->
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                            <!-- arc end point -->
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                        </gml:Arc>
                    </gml:segments>
                </gml:Curve> 
            </polygon>
        </EX_BoundingPolygon>
    </geographicExtent>

    <geographicExtent xmlns="http://schemas.espas-fp7.eu"  xmlns:gml="http://www.opengis.net/gml/3.2">
        <EX_BoundingPolygon xmlns="http://www.isotc211.org/2005/gmd">
        <!-- The LAT, LON coordinates of a point.  The "srsName" describes the coordinate system -->
            <polygon>
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                        </gml:LineStringSegment>
                    </gml:segments>
                </gml:Curve> 
            </polygon>
        </EX_BoundingPolygon>
    </geographicExtent>

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        <gmd:EX_BoundingPolygon >
            <gmd:polygon>
                <gml:Polygon gml:id="PID" >
                    <gml:exterior>
                        <gml:LinearRing>
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                    </gml:exterior>
                </gml:Polygon>
            </gmd:polygon>
        </gmd:EX_BoundingPolygon>
    </ns2:geographicExtent>
    
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    <gmd:EX_BoundingPolygon >
        <gmd:polygon>
            <gml:solid gml:id="SID">
                <gml:exterior>
                    <gml:Shell gml:aggregationType="set">
                        <gml:surfaceMember>
                            <gml:Polygon gml:id="DwnPID" >
                                <gml:exterior>
                                    <gml:LinearRing>
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                        <!--
                        <gml:surfaceMember>
                            <gml:Polygon gml:id="LefPID" >
                                <gml:exterior>
                                    <gml:LinearRing>
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                                      <gml:pos srsName="http://ontology.espas-fp7.eu/crs/WGS84spherical" srsDimension="3" >0.0 -90.0 1620.0</gml:pos>
                                      <gml:pos srsName="http://ontology.espas-fp7.eu/crs/WGS84spherical" srsDimension="3" >0.0 -90.0 90.0</gml:pos>
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                        </gml:surfaceMember>
                        <gml:surfaceMember>
                            <gml:Polygon gml:id="RigPID" >
                                <gml:exterior>
                                    <gml:LinearRing>
                                      <gml:pos srsName="http://ontology.espas-fp7.eu/crs/WGS84spherical" srsDimension="3" >0.0 90.0 90.0</gml:pos>
                                      <gml:pos srsName="http://ontology.espas-fp7.eu/crs/WGS84spherical" srsDimension="3" >360.0 90.0 90.0</gml:pos>
                                      <gml:pos srsName="http://ontology.espas-fp7.eu/crs/WGS84spherical" srsDimension="3" >360.0 90.0 1620.0</gml:pos>
                                      <gml:pos srsName="http://ontology.espas-fp7.eu/crs/WGS84spherical" srsDimension="3" >0.0 90.0 1620.0</gml:pos>
                                      <gml:pos srsName="http://ontology.espas-fp7.eu/crs/WGS84spherical" srsDimension="3" >0.0 90.0 90.0</gml:pos>
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                                </gml:exterior>
                            </gml:Polygon>
                        </gml:surfaceMember>
                        <gml:surfaceMember>
                            <gml:Polygon gml:id="DowSidPID" >
                                <gml:exterior>
                                    <gml:LinearRing>
                                      <gml:pos srsName="http://ontology.espas-fp7.eu/crs/WGS84spherical" srsDimension="3" >0.0 -90.0 90.0</gml:pos>
                                      <gml:pos srsName="http://ontology.espas-fp7.eu/crs/WGS84spherical" srsDimension="3" >0.0 90.0 90.0</gml:pos>
                                      <gml:pos srsName="http://ontology.espas-fp7.eu/crs/WGS84spherical" srsDimension="3" >0.0 90.0 1620.0</gml:pos>
                                      <gml:pos srsName="http://ontology.espas-fp7.eu/crs/WGS84spherical" srsDimension="3" >0.0 -90.0 1620.0</gml:pos>
                                      <gml:pos srsName="http://ontology.espas-fp7.eu/crs/WGS84spherical" srsDimension="3" >0.0 -90.0 90.0</gml:pos>
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                                </gml:exterior>
                            </gml:Polygon>
                        </gml:surfaceMember>
                        <gml:surfaceMember>
                            <gml:Polygon gml:id="UpSidPID" >
                                <gml:exterior>
                                    <gml:LinearRing>
                                      <gml:pos srsName="http://ontology.espas-fp7.eu/crs/WGS84spherical" srsDimension="3" >360.0 -90.0 90.0</gml:pos>
                                      <gml:pos srsName="http://ontology.espas-fp7.eu/crs/WGS84spherical" srsDimension="3" >360.0 90.0 90.0</gml:pos>
                                      <gml:pos srsName="http://ontology.espas-fp7.eu/crs/WGS84spherical" srsDimension="3" >360.0 90.0 1620.0</gml:pos>
                                      <gml:pos srsName="http://ontology.espas-fp7.eu/crs/WGS84spherical" srsDimension="3" >360.0 -90.0 1620.0</gml:pos>
                                      <gml:pos srsName="http://ontology.espas-fp7.eu/crs/WGS84spherical" srsDimension="3" >360.0 -90.0 90.0</gml:pos>
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                                </gml:exterior>
                            </gml:Polygon>
                        </gml:surfaceMember>
                        -->
                        <gml:surfaceMember>
                            <gml:Polygon gml:id="UpPID" >
                                <gml:exterior>
                                    <gml:LinearRing>
                                      <gml:pos srsName="http://ontology.espas-fp7.eu/crs/WGS84spherical" srsDimension="3" >0.0 90.0 1620.0</gml:pos>
                                      <gml:pos srsName="http://ontology.espas-fp7.eu/crs/WGS84spherical" srsDimension="3" >360.0 90.0 1620.0</gml:pos>
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                                      <gml:pos srsName="http://ontology.espas-fp7.eu/crs/WGS84spherical" srsDimension="3" >0.0 -90.0 1620.0</gml:pos>
                                      <gml:pos srsName="http://ontology.espas-fp7.eu/crs/WGS84spherical" srsDimension="3" >0.0 90.0 1620.0</gml:pos>
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                    </gml:Shell>
                </gml:exterior>
            </gml:solid>
        </gmd:polygon>
    </gmd:EX_BoundingPolygon>
</ns2:geographicExtent>

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    <gmd:EX_BoundingPolygon >
        <gmd:polygon>
            <gml:PolyhedralSurface gml:id="PSID">
                <gml:patches>
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                                <gml:pos srsName="http://ontology.espas-fp7.eu/crs/WGS84spherical" srsDimension="3" >360.0 90.0 90.0</gml:pos>
                                <gml:pos srsName="http://ontology.espas-fp7.eu/crs/WGS84spherical" srsDimension="3" >360.0 90.0 1620.0</gml:pos>
                                <gml:pos srsName="http://ontology.espas-fp7.eu/crs/WGS84spherical" srsDimension="3" >0.0 90.0 1620.0</gml:pos>
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