ISO 10303-214:2010(E)
A Shape_description_association is a mechanism to associate the definition of a shape or of a portion of a shape with a geometric representation.
NOTE Through Shape_description_association, it is possible to associate objects with geometry defined in an external document; the same is possible through Document_assignment. The difference between the two possibilities is that in the case of Shape_description_association, it is the shape of the object that is assigned whereas Document_assignment may be used to assign other kinds of geometry.
The data associated with a Shape_description_association are the following:
The defining_geometry specifies the Geometric_model or the External_model that contains the shape information.
See shape_description_association to external_geometric_model and shape_description_association to geometric_model for the application assertions.
There shall be exactly one object that defines the defining_geometry for a Shape_description_association.
The is_defining_shape_for specifies the object the Shape_description_association is associated with.
See shape_description_association to feature_definition, shape_description_association to general_feature, shape_description_association to item_shape, shape_description_association to shape_element, shape_description_association to shape_element_relationship, shape_description_association to thread_feature, and shape_description_association to transition_feature for the application assertions.
There shall be exactly one object that the Shape_description_association is_defining_shape_for.
The role specifies the function performed by the referenced model.
Where applicable the following values shall be used:
EXAMPLE For analysis purposes an 'idealized representation' that is not fully detailed in every respect may be sufficient and be preferable due to less overhead implied by its usage.
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