A gml:PointGrid group contains or references points or positions which are organised into sequences or grids. All rows shall have the same number of positions (columns).
<group name="PointGrid"><annotation><documentation>A gml:PointGrid group contains or references points or positions which are organised into sequences or grids. All rows shall have the same number of positions (columns).</documentation></annotation><sequence><element name="rows"><complexType><sequence><element name="Row" maxOccurs="unbounded"><complexType><group ref="gml:geometricPositionListGroup"/></complexType></element></sequence></complexType></element></sequence></group>