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Geometry
Placemark elements contain an element that extends the <Geometry> element. The <Geometry> element is either a vector geometry or a 3D model. FME does not currently support reading 3D models via <Model> elements. <Model> elements can be written by adding a set of geometry traits to any null geometry.
KML requires all vector geometry to use the LL84 coordinate system, and to have three dimensions. The KML writer will reproject input feature geometry to ensure that this constraint is fulfilled.
Note: An error will occur if the KML Writer encounters a feature with no specified coordinate system.