model.result().dataset().create(<dtag>,"ParCurve2D") creates a 2D parameterized curve dataset feature named
<dtag>.
model.result().dataset().create(<dtag>,"ParCurve3D") creates a 3D parameterized curve dataset feature named
<dtag>.
The global property can be useful for BEM models, for example, to be able to evaluate globally defined expressions outside the mesh.