Schema Central > NIEM 2.1 > geometryBasic0d1d.xsd > gml:geometricPositionGroup
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GML supports two different ways to specify a geometric position: either by a direct position (a data type) or a point (a geometric object).
pos elements are positions that are "owned" by the geometric primitive encapsulating this geometric position.
pointProperty elements contain a point that may be referenced from other geometry elements or reference another point defined elsewhere (reuse of existing points).

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