PDM-UG: External Geometric Model Structure

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External geometric models may be related together to form hierarchical geometric model structures. The orientation and location of two shape_representations relative to each other can be defined using a subtype of shape_representation_relationship that references a transformation. For example, one might want to specify such a transformation to geometrically relate representations of the part shape in order to relate the shape of components in an assembly structure for digital mock-up applications.