4.4.1 Constraint Association

The concept Constraint Association describes how object or object types may have associated constraints indicating a qualitative objective or a quantitative metric to be met.

Constraints based on metrics are measurable, such that the status of a metric being valid is computer-interpretable. Metric constraints are based on simple conditional logic such as greater than a particular value or included within a specified list or table. Constraints may be combine multiple metrics using boolean logic such as AND, OR, XOR, or NOT.

Figure 25 illustrates an instance diagram.

Constraint AssociationIfcObjectDefinitionIfcRelAssociatesConstraintIfcObjectiveIfcMetricIfcLabelIfcTextIfcBenchmarkEnumIfcMetricValueSelectIfcAppliedValueIfcLengthMeasureIfcRealIfcArithmeticOperatorEnumIfcAppliedValueIfcAppliedValueSelectIfcMeasureWithUnitIfcReferenceIfcValueIfcDerivedMeasureValueIfcMeasureValueIfcSimpleValueIfcTableIfcTableRowIfcTableColumnIfcIdentifierIfcLabelIfcTextIfcReferenceIfcReferenceIfcLogicalOperatorEnumIfcObjectiveEnum

Figure 25 — Constraint Association

Bridge View

Entity
IfcBeam-
-		 O
O		 -
-		 -
-
IfcRailing-
-		 O
O		 -
-		 -
-
IfcReinforcingBarTypeO
O		 O
O		 -
-		 -
-
IfcSlab-
-		 O
O		 -
-		 -
-

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