#### 6.5.3.1 IfcCostItem

| Item de coût
| Kostenelement

An IfcCostItem describes a cost or financial value together with descriptive information that describes its context in a form that enables it to be used within a cost schedule. An IfcCostItem can be used to represent the cost of goods and services, the execution of works by a process, lifecycle cost and more.

Each instance of IfcCostItem may have a name and a description. Depending on the use for which the cost is intended, these values should be asserted on the basis of agreement. For instance, the Name attribute could be used to provide a common value that enables distinct instances to be brought together in a nesting arrangement (see below) while the Description attribute may be used to provide text used for item description in a costing schedule.

An IfcCostItem can link one or many IfcCostValue's representing a unit cost, total cost, or a unit cost with one or many quantities used to generate the total cost. The quantities can be given as individual quantities, or those quantities are provided as element quantities by one or many building elements. The IfcCostValue.CostType attribute indicates the category of cost, which may be used to present the value in a particular column. For nested cost items (having IfcRelNests relationship), IfcCostValue.CostType is significant such that IfcCostValue.AppliedValue is calculated as the sum of all nested costs having the same IfcCostValue.CostType or if set to an asterisk ('*'), then the sum of all nested costs of all cost types. An IfcCostValue may represent an original value or a value derived from formulas using IfcAppliedValueRelationship. For example, taxes may be calculated as a percentage of a subtotal.

> HISTORY New entity in IFC2.0.

> IFC4 CHANGE Attribute PredefinedType, CostValues, and CostQuantities added.

## Electrical System Design

Instance diagram

Identity

The Identity concept applies to this entity.

Cost

The Cost concept applies to this entity.

XSD Specification:

<xs:element name="IfcCostItem" type="ifc:IfcCostItem" substitutionGroup="ifc:IfcControl" nillable="true"/>
<xs:complexType name="IfcCostItem">
<xs:complexContent>
<xs:extension base="ifc:IfcControl">
<xs:sequence>
<xs:element name="CostValues" nillable="true" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:element ref="ifc:IfcCostValue" maxOccurs="unbounded"/>
</xs:sequence>
<xs:attribute ref="ifc:itemType" fixed="ifc:IfcCostValue"/>
<xs:attribute ref="ifc:cType" fixed="list"/>
<xs:attribute ref="ifc:arraySize" use="optional"/>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>

EXPRESS Specification:

ENTITY IfcCostItem

| SUBTYPE OF (IfcControl);

PredefinedType | : | OPTIONAL IfcStrippedOptional;
CostValues | : | OPTIONAL LIST [1:?] OF IfcCostValue;
CostQuantities | : | OPTIONAL LIST [1:?] OF IfcStrippedOptional;

END_ENTITY;

Attribute Definitions:

CostValues | : | Component costs for which the total cost for the cost item is calculated, and then multiplied by the total CostQuantities if provided. If CostQuantities is provided then values indicate unit costs, otherwise values indicate total costs. For calculation purposes, the cost values may be directly added unless they have qualifications. Cost values with qualifications (e.g. IfcCostValue.ApplicableDate, IfcCostValue.FixedUntilDate) should be excluded from such calculation if they do not apply. IFC4 CHANGE The attribute has been added.
CostQuantities | : | Component quantities of the same type for which the total quantity for the cost item is calculated as the sum. IFC4 CHANGE The attribute has been added.

Inheritance Graph:

ENTITY IfcCostItem

| ENTITY IfcRoot

GlobalId | : | IfcGloballyUniqueId;
OwnerHistory | : | OPTIONAL IfcOwnerHistory;
Name | : | OPTIONAL IfcLabel;
Description | : | OPTIONAL IfcText;

| ENTITY IfcObjectDefinition

| INVERSE

HasAssignments | : | SET OF IfcRelAssigns FOR RelatedObjects;
Nests | : | SET [0:1] OF IfcRelNests FOR RelatedObjects;
IsNestedBy | : | SET OF IfcRelNests FOR RelatingObject;
HasContext | : | SET [0:1] OF IfcRelDeclares FOR RelatedDefinitions;
IsDecomposedBy | : | SET OF IfcRelAggregates FOR RelatingObject;
Decomposes | : | SET [0:1] OF IfcRelAggregates FOR RelatedObjects;
HasAssociations | : | SET OF IfcRelAssociates FOR RelatedObjects;

| ENTITY IfcObject

ObjectType | : | OPTIONAL IfcStrippedOptional;

| INVERSE

IsDeclaredBy | : | SET [0:1] OF IfcRelDefinesByObject FOR RelatedObjects;
Declares | : | SET OF IfcRelDefinesByObject FOR RelatingObject;
IsTypedBy | : | SET [0:1] OF IfcRelDefinesByType FOR RelatedObjects;
IsDefinedBy | : | SET OF IfcRelDefinesByProperties FOR RelatedObjects;

| ENTITY IfcControl

Identification | : | OPTIONAL IfcStrippedOptional;

| INVERSE

Controls | : | SET OF IfcRelAssignsToControl FOR RelatingControl;

| ENTITY IfcCostItem

PredefinedType | : | OPTIONAL IfcStrippedOptional;
CostValues | : | OPTIONAL LIST [1:?] OF IfcCostValue;
CostQuantities | : | OPTIONAL LIST [1:?] OF IfcStrippedOptional;

END_ENTITY;

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