PDM-UG: Relating portions of shape to each other
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This page belongs to the PDM Usage Guide.
By using the above described shape_representation_relationship concept, geometric relations of individual portions of shape defined as shape_aspects can be represented. If the portions of the shape together represent the part shape completely, geometric relationships between the shape_representations representing the individual shape_aspects and the shape_representation representing the product_definition_shape should be defined.
The Instance Model: EXPRESS entities and attributes
The EXPRESS entities and attributes used to support the requirements of relating portions of shape are illustrated in Diagram 13.
NOTE - the portions of shape related to each other are not necessarily portions of the same part shape. This capability might as well be used to e.g., define geometric orientations of the faces of a tool and a part for a machining operation.
