Specification for IfcCostResource

EXPRESS Definition

EXPRESS-G Diagram

Table of contents

• Schema Semantic Definition
• Simple Types
• Select Types
• Enumerations
• Class Definitions
• Functions

Simple Types

No Simple Types defined in this Schema

Select Types

No Select Types defined in this Schema

Enumerations

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

C	IfcCostEnum IfcCostOperatorEnum
M	IfcModifierBasisEnum

Class Definitions

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

C	IfcCost IfcCostModifier

Functions

No Functions defined in this Schema

Schema Semantic Definition

The IfcCostResource schema provides the means to identify the cost of an object or aggregation of objects.

NOTE: New schema for R2.0. This schema was formerly part of the IfcPropertyResource schema.

Type IfcCostEnum

EXPRESS Definition

Type Semantic Definition

Designation of the form of expression of a cost.

NOTE: Each cost may be designated as being of a particular type. A range of cost types are provided, one of which must be selected from the list to assign to the cost value.

Enumeration

LaborCost	The cost of human resources.
PlantCost	The cost for items of equipment rented or purchased for use on this project but which will not be embodied within the final product.
MaterialCost	The cost of materials purchased (or sold)
SubContractCost	A cost for work that is done by a third party under contract.
PreliminariesCost	Costs that describe work associated with a project but which do not form part of the completed product e.g. temporary construction works.
PrimeCost	A cost which is an amount to be included for work or services to be executed by a nominated actor.
BillOfMaterialsCost	A composite cost which is to be included within a formal bill of materials.
ProvisionalCost	A cost that is included for work that is foreseen but cannot be accurately specified at the time of costing.
OverheadCost	A cost that is included to account for administrative and non-productive work.
ProfitCost	A cost that is the difference between the selling price and the buying price of an artefact.

Type IfcCostOperatorEnum

EXPRESS Definition

Type Semantic Definition

A mathematical operator which determines how the cost modifier is to be applied to the cost to vary its value.

NOTE: Cost operators are specified as being by value or by percent.

If the operator is by value (add, subtract or multiply), this means that cost modifiers are applied directly according to the value attribute of the modifier. That is, for a selection of 'AddValue' with a value attribute of 20 on a cost of $120, the modified value would be determined by $120 + $20 = $140.

If the operator is by percent(add, subtract or multiply), this means that cost modifiers are applied by transforming the value attribute from a percentage to an actual value . That is, for a selection of 'AddPercent' with a value attribute of 20 on a cost of $120, the modified value would be determined by $120 + $(120 * 20/100) = $144.

History

This Enumeration has changed after IFC Release 1.5.1, please see the Migration Guide for details

Enumeration

AddValue

SubstractValue

MultiplyValue

AddPercent

SubstractPercent

MultiplyPercent

Type IfcModifierBasisEnum

EXPRESS Definition

Type Semantic Definition

The manner in which cost modifiers are applied to a cost.

NOTE: Cost modifiers may be applied to costs based either on the initial value of the cost or on the running total of cost after the application of a previous modifier. This attribute sets the basis upon which modifiers are applied.

NOTE that modifiers can only be applied on a single basis; it is not possible to mix the application of running and static modifiers to a single cost.

History

This Enumeration has changed after IFC Release 1.5.1, please see the Migration Guide for details

Enumeration

Running

Static

Class IfcCost

EXPRESS Definition

Class Semantic Definition

Amount to be paid for acquisition, installation, or assembly; associated with a product, process, or resource.

History

This Class has changed after IFC Release 1.5.1, please see the Migration Guide for details

Attribute and Relationship Definitions

Superclasses and Subclasses

This Class does not have any Superclasses or Subclasses

Attributes and Relationships

Attribute type (OPT, DER, INV)		Redefinition (SELF)
	Attribute / Relation		Data or Rel. type	Definition
	CostType		IfcCostEnum	Type of Cost specified.
OPT	BaseCostValue		IfcMonetaryMeasure	Amount of this cost before the application of cost modifiers.
OPT	FinalCostValue		IfcMonetaryMeasure	Amount of this cost following the application of cost modifiers.
	Currency		IfcCurrencyEnum	Currency for this cost amount. NOTE - Currencies are defined by standard three character designations as used by banks and financial institutions.
OPT	ModifierBasis		IfcModifierBasisEnum	The manner in which cost modifiers are applied to a cost. NOTE - Where cost modifiers are specified, the modifier basis must be asserted.
	ModifierValues		LIST [0:?] OF IfcCostModifier	Modifiers which may be applied to a cost to change its value.
	UnitCostBasis		IfcMeasureWithUnit	The number and unit of measure on which the unit cost is based. NOTE - As well as the normally expected units of measure such as length, area, volume etc., costs may be based on units of measure which need to be defined e.g. sack, drum, pallet etc. Unit costs may be based on quantities greater (or lesser) than a unitary value of the basis measure. For instance, timber may have a unit cost rate per X meters where X > 1; similarly for cable, piping and many other items. The basis number may be either an integer or a real value.
OPT	CostDate		IfcDateTimeSelect	The date at which the cost is applied.
	CostComponents		LIST [0:?] OF IfcCost	Costs that are components of another cost and from which that cost may be deduced. NOTE - Allows an estimator to roll up components (estimates or bids) into composite costs for assemblies.
INV	ComponentOf		SET [0:?] OF IfcCost

Geometry Use Definitions

Instances of this class have no physical presence and therefore no geometric representation.

Class IfcCostModifier

EXPRESS Definition

Class Semantic Definition

Modifier which influences a cost.

NOTE: A cost modifier is given either as a value or as a percentage and is applied using the specified cost operator designation which indicates the action of the operator.

History

This Class has changed after IFC Release 1.5.1, please see the Migration Guide for details

Attribute and Relationship Definitions

Superclasses and Subclasses

This Class does not have any Superclasses or Subclasses

Attributes and Relationships

Attribute type (OPT, DER, INV)		Redefinition (SELF)
	Attribute / Relation		Data or Rel. type	Definition
	Purpose		STRING	The purpose for which a cost modifier is applied. NOTE - Each cost modifier may be assigned a purpose by which it may be recognized. Purposes might include trade discount, quantity discount, bulk purchase rebate, postage and packing cost, abnormal working conditions factor etc.
	CostValue		REAL	The value assigned to a cost factor.
	CostOperator		IfcCostOperatorEnum	A mathematical operator that determines how the cost modifier is to be applied to the cost to vary its value.

Geometry Use Definitions

Instances of this class have no physical presence and therefore no geometric representation.