4.9.1.4 Type Clearance Geometry

For elements that require clearance such as for safety, maintenance, or other purpose, this represents the 3D clearance volume of the item having RepresentationType of 'Surface3D'. Such clearance region indicates space that should not intersect with the 'Body' representation of other elements, though may intersect with the 'Clearance' representation of other elements.

Figure 103 illustrates an instance diagram.

Type Clearance GeometryIfcDistributionElementTypeIfcRepresentationMapIfcAxis2Placement3DIfcAxis2Placement2DIfcShapeRepresentationIfcGeometricRepresentationContextIfcLabelIfcLabelIfcBoundedSurface

Figure 103 — Type Clearance Geometry

mvdXML Specification
<?xml version="1.0"?>
<ConceptTemplate xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" uuid="f1ebb0f3-96c9-4912-a475-d012a23f8179" name="Type Clearance Geometry" status="sample" applicableSchema="IFC4" applicableEntity="IfcDistributionElementType">
  <Rules>
    <AttributeRule AttributeName="RepresentationMaps">
      <EntityRules>
        <EntityRule EntityName="IfcRepresentationMap">
          <AttributeRules>
            <AttributeRule AttributeName="MappedRepresentation">
              <EntityRules>
                <EntityRule EntityName="IfcShapeRepresentation">
                  <AttributeRules>
                    <AttributeRule AttributeName="ContextOfItems">
                      <EntityRules>
                        <EntityRule EntityName="IfcGeometricRepresentationContext" />
                      </EntityRules>
                    </AttributeRule>
                    <AttributeRule AttributeName="RepresentationIdentifier">
                      <EntityRules>
                        <EntityRule EntityName="IfcLabel">
                          <AttributeRules>
                            <AttributeRule Description="Value=Clearance" AttributeName="Value=Clearance" />
                          </AttributeRules>
                        </EntityRule>
                      </EntityRules>
                    </AttributeRule>
                    <AttributeRule RuleID="Type" AttributeName="RepresentationType">
                      <EntityRules>
                        <EntityRule EntityName="IfcLabel" />
                      </EntityRules>
                    </AttributeRule>
                    <AttributeRule RuleID="Geometry" AttributeName="Items">
                      <EntityRules>
                        <EntityRule EntityName="IfcBoundedSurface" />
                      </EntityRules>
                    </AttributeRule>
                  </AttributeRules>
                </EntityRule>
              </EntityRules>
            </AttributeRule>
            <AttributeRule AttributeName="MappingOrigin">
              <EntityRules>
                <EntityRule EntityName="IfcAxis2Placement3D" />
                <EntityRule EntityName="IfcAxis2Placement2D" />
              </EntityRules>
            </AttributeRule>
          </AttributeRules>
        </EntityRule>
      </EntityRules>
    </AttributeRule>
  </Rules>
</ConceptTemplate>

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