Figure 245 — Reference Geometry
A specific form of geometry representation is the 'Reference' geometry. It is used to provide a geometry used for various forms of assessments (like for quantities, etc.) but not for display and also not for implicit Boolean operations in a voiding relationship.
EXAMPLE An example is the use of 'Reference' representation is for opening elements that shall not be used to create a void using the IfcRelVoidsElement relationship, since the voids are already part of the 'Body' representation of the voided element. The representation identifier of the representation is:
- IfcShapeRepresentation.RepresentationIdentifier = 'Reference'
Figure 245 illustrates an instance diagram.
|
Figure 245 — Reference Geometry |
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<Rules>
<AttributeRule AttributeName="Representation">
<EntityRules>
<EntityRule EntityName="IfcProductDefinitionShape">
<AttributeRules>
<AttributeRule AttributeName="Name" />
<AttributeRule AttributeName="Description" />
<AttributeRule AttributeName="Representations">
<EntityRules>
<EntityRule EntityName="IfcShapeRepresentation">
<AttributeRules>
<AttributeRule AttributeName="ContextOfItems">
<EntityRules>
<EntityRule EntityName="IfcGeometricRepresentationContext" />
</EntityRules>
</AttributeRule>
<AttributeRule RuleID="Identifier" AttributeName="RepresentationIdentifier">
<EntityRules>
<EntityRule EntityName="IfcLabel">
<Constraints>
<Constraint Expression="Identifier[Value] = 'Reference'" />
</Constraints>
</EntityRule>
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<AttributeRule RuleID="Type" AttributeName="RepresentationType">
<EntityRules>
<EntityRule EntityName="IfcLabel" />
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<SubTemplates>
<ConceptTemplate uuid="158a3bda-e2da-43c5-97d3-4c12f5e75995" name="Reference SweptSolid Geometry" applicableSchema="IFC4" applicableEntity="IfcProduct">
<Rules>
<AttributeRule AttributeName="Representation">
<EntityRules>
<EntityRule EntityName="IfcProductDefinitionShape">
<AttributeRules>
<AttributeRule AttributeName="Name" />
<AttributeRule AttributeName="Description" />
<AttributeRule AttributeName="Representations">
<EntityRules>
<EntityRule EntityName="IfcShapeRepresentation">
<AttributeRules>
<AttributeRule AttributeName="ContextOfItems">
<EntityRules>
<EntityRule EntityName="IfcGeometricRepresentationContext" />
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</AttributeRule>
<AttributeRule RuleID="Identifier" AttributeName="RepresentationIdentifier">
<EntityRules>
<EntityRule EntityName="IfcLabel">
<Constraints>
<Constraint Expression="Identifier[Value] = 'Reference'" />
</Constraints>
</EntityRule>
</EntityRules>
</AttributeRule>
<AttributeRule RuleID="Type" AttributeName="RepresentationType">
<EntityRules>
<EntityRule EntityName="IfcLabel">
<Constraints>
<Constraint Expression="Type[Value] = 'SweptSolid'" />
</Constraints>
</EntityRule>
</EntityRules>
</AttributeRule>
<AttributeRule AttributeName="Items">
<EntityRules>
<EntityRule EntityName="IfcSweptAreaSolid" />
</EntityRules>
</AttributeRule>
</AttributeRules>
</EntityRule>
</EntityRules>
</AttributeRule>
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<ConceptTemplate uuid="903ec934-3d30-4988-a9ab-21815fc634d7" name="Reference SweptSolid PolyCurve Geometry" applicableSchema="IFC4" applicableEntity="IfcProduct">
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<AttributeRule AttributeName="Representation">
<EntityRules>
<EntityRule EntityName="IfcProductDefinitionShape">
<AttributeRules>
<AttributeRule AttributeName="Name" />
<AttributeRule AttributeName="Description" />
<AttributeRule AttributeName="Representations">
<EntityRules>
<EntityRule EntityName="IfcShapeRepresentation">
<AttributeRules>
<AttributeRule AttributeName="ContextOfItems">
<EntityRules>
<EntityRule EntityName="IfcGeometricRepresentationContext" />
</EntityRules>
</AttributeRule>
<AttributeRule RuleID="Identifier" AttributeName="RepresentationIdentifier">
<EntityRules>
<EntityRule EntityName="IfcLabel">
<Constraints>
<Constraint Expression="Identifier[Value] = 'Reference'" />
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<AttributeRule RuleID="Type" AttributeName="RepresentationType">
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<EntityRule EntityName="IfcLabel">
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<Constraint Expression="Type[Value] = 'SweptSolid'" />
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</AttributeRule>
<AttributeRule AttributeName="Items">
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<EntityRule EntityName="IfcSweptAreaSolid">
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<ConceptTemplate uuid="c10a7cd4-27e6-465f-a76e-da460daed660" name="Reference Tessellation Geometry" applicableSchema="IFC4" applicableEntity="IfcProduct">
<Rules>
<AttributeRule AttributeName="Representation">
<EntityRules>
<EntityRule EntityName="IfcProductDefinitionShape">
<AttributeRules>
<AttributeRule AttributeName="Name" />
<AttributeRule AttributeName="Description" />
<AttributeRule AttributeName="Representations">
<EntityRules>
<EntityRule EntityName="IfcShapeRepresentation">
<AttributeRules>
<AttributeRule AttributeName="ContextOfItems">
<EntityRules>
<EntityRule EntityName="IfcGeometricRepresentationContext" />
</EntityRules>
</AttributeRule>
<AttributeRule RuleID="Identifier" AttributeName="RepresentationIdentifier">
<EntityRules>
<EntityRule EntityName="IfcLabel">
<Constraints>
<Constraint Expression="Identifier[Value] = 'Reference'" />
</Constraints>
</EntityRule>
</EntityRules>
</AttributeRule>
<AttributeRule RuleID="Type" AttributeName="RepresentationType">
<EntityRules>
<EntityRule EntityName="IfcLabel">
<Constraints>
<Constraint Expression="Type[Value] = 'Tessellation'" />
</Constraints>
</EntityRule>
</EntityRules>
</AttributeRule>
<AttributeRule AttributeName="Items">
<EntityRules>
<EntityRule EntityName="IfcTriangulatedFaceSet">
<References>
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</References>
</EntityRule>
<EntityRule EntityName="IfcPolygonalFaceSet">
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