Returns the OdDb2dPolyline OCS position of this entity (DXF 10).
Each OdDb2dPolyline is described a series of OCS OdDb2dVertices and an elevation.
While Z coordinates are set and retrieved by setPosition() and position() respectively, they are ignored by the Polyline.
The elevation of the Polyline can be changed only with OdDb2dPolyline::setElevation().
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