IfcDimensionCurveDirectedCallout

Definition from IAI: The dimension curve directed callout is a dimension callout, which includes a dimension line. It normally presents an extent and/or direction of the product shape. Subtypes are introduced to declare specific forms of dimension curve directed callouts, such as:

linear dimension
radius dimension
diameter dimension
angular dimension

NOTE: The IfcDimensionCurveDirectedCallout is an entity that had been adopted from ISO 10303, Industrial automation systems and integration—Product data representation and exchange, Part 101: Integrated application resources: Draughting.

NOTE Corresponding STEP name: dimension_curve_directed_callout. Please refer to ISO/IS 10303-101:1994 page 24 for the final definition of the formal standard.

HISTORY New entity in Release IFC2x 2nd Edition.

EXPRESS specification:

ENTITY IfcDimensionCurveDirectedCallout

SUPERTYPE OF

(ONEOF(IfcLinearDimension, IfcAngularDimension, IfcRadiusDimension, IfcDiameterDimension))

SUBTYPE OF (

IfcDraughtingCallout);

WHERE

WR41	:	SIZEOF(QUERY (Dc <* SELF\IfcDraughtingCallout.Contents \| ( 'IFCPRESENTATIONDIMENSIONINGRESOURCE.IFCDIMENSIONCURVE' IN TYPEOF(Dc)))) = 1;
WR42	:	SIZEOF (QUERY (Dc <* SELF.contents \| ('IFCPRESENTATIONDIMENSIONINGRESOURCE.IFCPROJECTIONCURVE' IN TYPEOF (Dc)))) <= 2;

END_ENTITY;

Formal Propositions:

WR41	:	There shall be exactly one dimension curve in the set of draughting callout elements.
WR42	:	There shall be only zero, one, or two projection curves within the content of the callout.

Inheritance graph

ENTITY IfcDimensionCurveDirectedCallout;

ENTITY IfcRepresentationItem;

INVERSE

LayerAssignments

SET OF IfcPresentationLayerAssignment FOR AssignedItems;

StyledByItem

SET [0:1] OF IfcStyledItem FOR Item;

ENTITY IfcGeometricRepresentationItem;

ENTITY IfcDraughtingCallout;

Contents

SET [1:?] OF IfcDraughtingCalloutElement;

INVERSE

IsRelatedFromCallout

SET OF IfcDraughtingCalloutRelationship FOR RelatedDraughtingCallout;

IsRelatedToCallout

SET OF IfcDraughtingCalloutRelationship FOR RelatingDraughtingCallout;

ENTITY IfcDimensionCurveDirectedCallout;

END_ENTITY;