IfcCostModifier

IfcCostModifier

Definition from IAI: An IfcCostModifier is a modifier object which influences a cost.

HISTORY: New entity in IFC Release 1.5, this Entity has changed within IFC Release 2x.

ISSUES: See issue and change log for changes made in IFC Release 2x.

Use Definition

Cost modifiers can potentially be applied on quite complex bases (e.g., a percentage markup on hours of overtime labor). Cost modifiers can accommodate other cost modifiers calculated on a simple basis only (static/running and add/subtract/multiply). Modifiers applied on a more complex basis can be converted within cost applications to these simple bases (e.g., the more complex modifier can be resolved into a fixed currency value modifier).

EXPRESS specification:

ENTITY IfcCostModifier;

Purpose

IfcText;

ModifierValue

IfcCostModifierValueSelect;

ModifierDate

IfcCalendarDate;

CostOperator

IfcCostOperatorEnum;

ModifierBasis

OPTIONAL IfcCostModifierBasisEnum;

INVERSE

ModifiedCost

SET OF IfcCostValue FOR CostModifiers;

ModifiersReferenced

SET OF IfcReferencesCostDocument FOR ReferencingModifiers;

END_ENTITY;

Attribute definitions:

Purpose	:	The purpose for which a cost modifier is applied. --- Note: Examples of the purpose of a cost modifier could include: - trade discount, - bulk purchase rebate, - small quantity surcharge, - large quantity discount, - delivery charge, - waste allowance, - postage and packing charge, - factor to allow for working conditions (working at height, working in a hazardous or dirty environment etc.), - adjustments for costs derived from historical data (source date to project date adjustment, source location to project location adjustment), - etc. ---
ModifierValue	:	The value assigned to a cost modifier.
ModifierDate	:	The date at which a modifier is applicable.
CostOperator	:	A mathematical operator that determines how the cost modifier is to be applied to the cost to vary its value.
ModifierBasis	:	The manner in which cost modifiers are applied to a cost. Note: Where cost modifiers are specified, the modifier basis must be asserted.
ModifiedCost	:	Cost value the cost modifier is assigned to.
ModifiersReferenced	:	Pointer to the IfcReferencesCostDocument relationship, which refer to a document from which the cost modifier is referenced.