Schema Central > NIEM 2.1 > geometryBasic0d1d.xsd > gml:geometricPositionListGroup
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GML supports two different ways to specify a list of geometric positions: either by a sequence of geometric positions (by reusing the group definition) or a sequence of direct positions (element posList). 
The posList element allows for a compact way to specify the coordinates of the positions, if all positions are represented in the same coordinate reference system.

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