[attribute] ^comparison_operator:equal_or_not_equal^ value

Note that the following statements are acceptable:

- Attribute = empty

- Attribute = not empty

- Attribute is empty

However, please avoid using:

- Attribute is not empty

Usages:

• Then [its entity type] ^is^ ‘IfcAlignment’

  ALB002 Alignment layout relationships - v1:19

• Then [its entity type] ^is^ ‘IfcAlignmentSegment’

  ALB002 Alignment layout relationships - v1:28

• Then [its entity type] ^is^ ‘IfcAlignmentHorizontalSegment’

  ALB002 Alignment layout relationships - v1:43

• Then [its entity type] ^is^ ‘IfcAlignmentVerticalSegment’

  ALB002 Alignment layout relationships - v1:43

• Then [its entity type] ^is^ ‘IfcAlignmentCantSegment’

  ALB002 Alignment layout relationships - v1:43

• Given [Its entity type] ^is^ ‘IfcAlignmentVerticalSegment’

  ALB012 Alignment vertical segment radius of curvature - v2:14

• Then [Its Entity Type] ^is^ ‘IfcLocalPlacement’

  ALB030 Alignment local placement - v1:14

• Then [Its entity type] ^is^ ‘IfcCurveSegment’

  ALS004 Alignment segment shape representation - v2:27

• Then [Its entity type] ^is^ ‘IfcCompositeCurve’ or ‘IfcIndexedPolycurve’ or ‘IfcPolyline’ or ‘IfcOffsetCurveByDistances’

  ALS005 Alignment shape representation - v3:25

• Then [Its entity type] ^is^ ‘IfcGradientCurve’ or ‘IfcSegmentedReferenceCurve’ or ‘IfcIndexedPolycurve’ or ‘IfcPolyline’ or ‘IfcOffsetCurveByDistances’

  ALS005 Alignment shape representation - v3:33

• Then [Its entity type] ^is^ ‘IfcGradientCurve’ or ‘IfcSegmentedReferenceCurve’ or ‘IfcCompositeCurve’ or ‘IfcIndexedPolycurve’ or ‘IfcPolyline’ or ‘IfcOffsetCurveByDistances’

  ALS005 Alignment shape representation - v3:45

• Given [its entity type] ^is^ ‘IfcGradientCurve’

  ALS011 Alignment segment entity type consistency - v3:38

• Given [its entity type] ^is^ ‘IfcSegmentedReferenceCurve’

  ALS011 Alignment segment entity type consistency - v3:38

• Given [its entity type] ^is^ ‘IfcGradientCurve’

  ALS011 Alignment segment entity type consistency - v3:54

• Given [its entity type] ^is^ ‘IfcSegmentedReferenceCurve’

  ALS011 Alignment segment entity type consistency - v3:54

• Given [Its Entity Type] ^is^ ‘IfcCompositeCurve’

  ALS012 Alignment segment start and length attribute types - v1:17

• Given [Its Entity Type] ^is^ ‘IfcCurveSegment’

  ALS012 Alignment segment start and length attribute types - v1:19

• Given [Its Entity Type] ^is^ ‘IfcGradientCurve’

  ALS012 Alignment segment start and length attribute types - v1:17

• Given [Its Entity Type] ^is^ ‘IfcSegmentedReferenceCurve’

  ALS012 Alignment segment start and length attribute types - v1:17

• Given [Its Entity Type] ^is^ ‘IfcCompositeCurve’

  ALS016 Alignment horizontal segment geometric continuity - v3:22

• Given [Its Entity Type] ^is^ ‘IfcCurveSegment’

  ALS016 Alignment horizontal segment geometric continuity - v3:24

• Given [Its Entity Type] ^is^ ‘IfcGradientCurve’

  ALS017 Alignment vertical segment geometric continuity - v4:20

• Given [Its Entity Type] ^is^ ‘IfcCurveSegment’

  ALS017 Alignment vertical segment geometric continuity - v4:22

• Given [its entity type] ^is^ ‘IfcRelAggregates’

  ASM000 Composed elements - v1:15

• Given [Its Entity Type] ^is^ ‘IfcPolyLoop’

  ( ⚠ BRP001 Polyhedral IfcFace boundary no self intersections - v2) (disabled):15

• Given [its entity type] ^is^ ‘IfcRelAssociatesClassification’

  CLS000 Classification association - v1:15

• Given [its entity type] ^is^ ‘IfcClassificationReference’

  CLS000 Classification association - v1:17

• Given [its entity type] ^is^ ‘IfcRelAssociatesMaterial’

  CTX000 Presentation colours and textures - v2:26

• Given [its entity type] ^is^ ‘IfcMaterial’

  CTX000 Presentation colours and textures - v2:29

• Given [its entity type] ^is^ ‘IfcStyledItem’

  CTX000 Presentation colours and textures - v2:33

• Given [Its entity type] ^is^ ‘IfcGridPlacement’

  GDP000 Grid placement - v1:12

• Given [Its entity type] ^is^ ‘IfcShapeRepresentation’

  GEM004 Constraints on representation identifiers - v3:23

• Given [Its entity type] ^is^ ‘IfcTopologyRepresentation’

  GEM004 Constraints on representation identifiers - v3:34

• Given [its entity type] ^is not^ ‘IfcAlignment’

  GEM011 Curve segments consistency - v2:15

• Given [its entity type] ^is^ ‘IfcCompositeCurve’

  GEM011 Curve segments consistency - v2:23

• Given [its entity type] ^is^ ‘IfcGradientCurve’

  GEM011 Curve segments consistency - v2:23

• Given [its entity type] ^is^ ‘IfcSegmentedReferenceCurve’

  GEM011 Curve segments consistency - v2:23

• Given [its entity type] ^is^ ‘IfcGradientCurve’

  GEM011 Curve segments consistency - v2:38

• Given [its entity type] ^is^ ‘IfcSegmentedReferenceCurve’

  GEM011 Curve segments consistency - v2:38

• Given [its entity type] ^is^ ‘IfcLinearPlacement’

  LIP000 Linear Placement - v1:14

• Given [Its entity type] ^is^ ‘IfcLocalPlacement’

  LOP000 Local placement - v1:12

• Given [its entity type] ^is^ ‘IfcRelAssociatesMaterial’

  MAT000 Materials - v1:15

• Given [its entity type] ^is^ ‘IfcRelAssociatesMaterial’

  MAT000 Materials - v1:27

• Given [its entity type] ^is^ ‘IfcMappedItem’

  MPD001 Correct use of RepresentationType and RepresentationIdentifier in the context of IfcMappedItem - v1:14

• Given [its entity type] ^is^ ‘IfcMappedItem’

  MPD001 Correct use of RepresentationType and RepresentationIdentifier in the context of IfcMappedItem - v1:25

• Given [its entity type] ^is^ ‘IfcConversionBasedUnit’

  PJS001 Correct conversion based units - v2:17

• Then [its entity type] ^is^ ‘IfcSIUnit’

  PJS001 Correct conversion based units - v2:29

• Given [its entity type] ^is^ ‘IfcRelConnectsPorts’

  POR000 Port connectivity and nesting - v1:14

• Given [its entity type] ^is^ ‘IfcDistributionPort’

  POR000 Port connectivity and nesting - v1:16

• Given [its entity type] ^is^ ‘IfcRelDefinesByProperties’

  QTY000 Quantities for objects - v1:14

• Given [its entity type] ^is^ ‘IfcElementQuantity’

  QTY000 Quantities for objects - v1:16

• Given [Its Type] ^is not^ ‘IfcGrid’

  SPS007 Spatial containment - v6:42

• Given [Its Type] ^is not^ ‘IfcAnnotation’

  SPS007 Spatial containment - v6:43

• Given [Its entity type] ^is^ ‘IfcDerivedProfileDef’ or ‘IfcMirroredProfileDef’

  SWE002 Mirroring within IfcDerivedProfileDef shall not be used - v2:23

• Given [Its Entity Type] ^is^ ‘IfcIndexedPolygonalFaceWithVoids’

  ( ⚠ TAS001 Polygonal face boundary no self intersections - v2) (disabled):20