## 8.10 IfcRepresentationResource

### 8.10.1 Schema Definition

Definition of the IAI: This schema defines the representation of shape and topology as important definitional properties for products defined within the IFC Object Model. The representations characterize certain properties of a product, and any product can be defined by zero, one, or many of those properties. The schema defines two ways to represent definitional properties of products:

- topological representation
- geometric shape representation

The geometric shape representation allows for

- multiple shape representations for the same product definition shape of a product
- separate shape representations for components or parts of the product definition shape by using shape aspects

The following parts of ISO10303, STEP, had been reviewed to provide input into the specification of the representation resource for the IFC Object Model:

- Part 41, Integrated Generic Resources – Fundamental of Product Description and Support product_property_definition_schema product_property_representation_schema
- Part 42, Integrated Generic Resources – Geometric and Topological Representation geometry_schema
- Part 43, Integrated Generic Resources – Representation Structures representation_schema

Please note, that the above listed resources which are defined within Integrated Resources of STEP had been interpreted to fit into the IFC architecture.

EXPRESS-G diagram

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