IfcCost

IfcCost

Definition from IAI: An IfcCost is a cost with context information. It represents goods, services, or the execution of works of a described elemental nature in given conditions. This entity also has the capability of nesting other costs of the same type through its relationships to IfcRelNests. The relationship to IfcObject through IfcRelCostsObjects specifies the objects to be costed by IfcCost instances.

The IfcRelNests provides a model mechanism to allow IfcCost to contain other items of the same type. It provides the relationships between the nesting IfcCost and nested IfcCost(s).

The figure shows how cost elements can be grouped into one cost, represented by costs being nested within another cost (using the IfcRelNests relationship).

HISTORY New Entity in IFC Release 2.0

ISSUES: None so far.

Use Definitions

Instances of IfcCost are used for cost estimates, budgets, etc., where a variety of identification codes are used extensively to identify the meaning of the cost. Examples include project phase codes, CSI codes, takeoff sequence numbers, cost accounts, etc.

The IFC model allows for all classes that are ultimately subtypes of IfcObject to inherit the ability to have one or more instances of IfcClassificationNotation to be assigned.

Where identification codes are required, the generic IFC classification facility should be used.

EXPRESS specification:

ENTITY IfcCost

SUBTYPE OF (

IfcControl);

ContextDescription

IfcLabel;

ElementCost

OPTIONAL IfcCostValue;

ExtensionCost

OPTIONAL IfcCostValue;

CostUse

IfcCostUseEnum;

PreparedOn

OPTIONAL IfcCalendarDate;

Quantities

OPTIONAL LIST [1:?] OF UNIQUE IfcCostQuantity;

CostType

IfcLabel;

INVERSE

CostSchedule

IfcCostSchedule FOR CostElements;

WHERE

WR1

SIZEOF(QUERY(temp <* SELF\IfcControl.Controls | NOT('IFCSHAREDMGMTELEMENTS.IFCRELCOSTSOBJECTS' IN TYPEOF(temp)))) = 0;

END_ENTITY;

Attribute definitions:

ContextDescription	:	The contextual information of the cost such as purchase cost, installation cost, consulting cost, etc.
ElementCost	:	The cost of a single item of each 'Quantity'. It can be either a unit cost or an item cost depending on the context of the cost element.
ExtensionCost	:	The summarized the cost of this cost element.
CostUse	:	Indicates how the value of the ElementCost and ExtensionCost is provided and thus how they should be used.
PreparedOn	:	The date that the cost is provided.
Quantities	:	Indicates the quantities of the items referenced by the cost.
CostType	:	A type of cost that is expressed.
CostSchedule	:	A reference to the cost schedule to which the cost element belongs.

References (2):

Name

Type

Referred through

Express-G

IfcControl

Entity

Subtype

Diagram 1

IfcCostSchedule

Entity

Attribute 'CostElements'

Diagram 3

Inheritance graph

ENTITY IfcCost;

ENTITY IfcRoot;

GlobalId

IfcGloballyUniqueId;

OwnerHistory

IfcOwnerHistory;

Name

OPTIONAL IfcLabel;

Description

OPTIONAL IfcText;

ENTITY IfcObject;

ObjectType

OPTIONAL IfcLabel;

INVERSE

IsDefinedBy

SET OF IfcRelDefines FOR RelatedObjects;

HasAssociations

SET OF IfcRelAssociates FOR RelatedObjects;

HasAssignments

SET OF IfcRelAssigns FOR RelatedObjects;

Decomposes

SET OF IfcRelDecomposes FOR RelatedObjects;

IsDecomposedBy

SET [0:1] OF IfcRelDecomposes FOR RelatingObject;

ENTITY IfcControl;

INVERSE

Controls

SET OF IfcRelAssignsToControl FOR RelatingControl;

ENTITY IfcCost;

ContextDescription

IfcLabel;

ElementCost

OPTIONAL IfcCostValue;

ExtensionCost

OPTIONAL IfcCostValue;

CostUse

IfcCostUseEnum;

PreparedOn

OPTIONAL IfcCalendarDate;

Quantities

OPTIONAL LIST [1:?] OF UNIQUE IfcCostQuantity;

CostType

IfcLabel;

INVERSE

CostSchedule

IfcCostSchedule FOR CostElements;

END_ENTITY;