4.1.6.3 Quantity Sets
Any specialization of object can be related to multiple quantity set occurrences. A quantity set contains multiple quantity occurrences. The data type of quantity occurrence values are count, length, area, volume, weight, time, or a combination of quantities. Each quantity is defined by its name, value, and optionally a description and a formula.
The quantity set is expressed by instances of IfcElementQuantity Name attribute determines the common designator of the quantity set. This specification contains a number of predefined quantity sets, a template definition is provided for each of them. The name of the template has to be used as the value of the Name attribute. The MethodOfMeasurement attribute specifies the method, by which the values of the individual quantities are calculated. For the quantity set templates included in this specification, the value of MethodOfMeasurement shall be "BaseQuantities".
The following diagram shows the generic classes and relationships used when applying this concept.
In addition, concepts may have particular importance to common or standardised industry practices and scenarios. For these specific usage scenarios, the table below shows a recommended list of general usage patterns that users may adopt.
G
<a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcObject.htm">IfcObject</a>
IfcObject 1. GlobalId
[1:1]
2. OwnerHistory
[0:1]
3. Name
[0:1]
4. Description
[0:1]
HasAssignments
[0:?]
Nests
[0:1]
IsNestedBy
[0:?]
HasContext
[0:1]
IsDecomposedBy
[0:?]
Decomposes
[0:1]
HasAssociations
[0:?]
5. ObjectType
[0:1]
IsDeclaredBy
[0:1]
Declares
[0:?]
IsTypedBy
[0:1]
IsDefinedBy
[0:?]
...
PredefinedType
PredefinedType
<a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcRelDefinesByProperties.htm">IfcRelDefinesByProperties</a>
IfcRelDefinesByProperties 1. GlobalId
[1:1]
2. OwnerHistory
[0:1]
3. Name
[0:1]
4. Description
[0:1]
5. RelatedObjects
[1:?]
6. RelatingPropertyDefinition
[1:1]
<a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcObject.htm">IfcObject</a>:IsDefinedBy1-><a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcRelDefinesByProperties.htm">IfcRelDefinesByProperties</a>:RelatedObjects0
<a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcElementQuantity.htm">IfcElementQuantity</a>
IfcElementQuantity 1. GlobalId
[1:1]
2. OwnerHistory
[0:1]
QsetName
3. Name
[0:1]
4. Description
[0:1]
HasContext
[0:1]
HasAssociations
[0:?]
DefinesType
[0:?]
IsDefinedBy
[0:?]
DefinesOccurrence
[0:?]
5. MethodOfMeasurement
[0:1]
Quantities
6. Quantities
[1:?]
<a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcRelDefinesByProperties.htm">IfcRelDefinesByProperties</a>:RelatingPropertyDefinition1-><a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcElementQuantity.htm">IfcElementQuantity</a>:IfcElementQuantity0
IfcLabel_0
IfcLabel
<a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcElementQuantity.htm">IfcElementQuantity</a>:Name1->IfcLabel_0:IfcLabel0
<a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcText.htm">IfcText</a>
IfcText
<a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcElementQuantity.htm">IfcElementQuantity</a>:Description1-><a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcText.htm">IfcText</a>:IfcText0
IfcLabel_1
IfcLabel
<a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcElementQuantity.htm">IfcElementQuantity</a>:MethodOfMeasurement1->IfcLabel_1:IfcLabel0
<a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcQuantityLength.htm">IfcQuantityLength</a>
IfcQuantityLength 1. Name
[1:1]
2. Description
[0:1]
HasExternalReferences
[0:?]
PartOfComplex
[0:1]
3. Unit
[0:1]
4. LengthValue
[1:1]
5. Formula
[0:1]
<a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcElementQuantity.htm">IfcElementQuantity</a>:Quantities1-><a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcQuantityLength.htm">IfcQuantityLength</a>:IfcQuantityLength0
<a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcQuantityArea.htm">IfcQuantityArea</a>
IfcQuantityArea 1. Name
[1:1]
2. Description
[0:1]
HasExternalReferences
[0:?]
PartOfComplex
[0:1]
3. Unit
[0:1]
4. AreaValue
[1:1]
5. Formula
[0:1]
<a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcElementQuantity.htm">IfcElementQuantity</a>:Quantities1-><a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcQuantityArea.htm">IfcQuantityArea</a>:IfcQuantityArea0
<a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcQuantityVolume.htm">IfcQuantityVolume</a>
IfcQuantityVolume 1. Name
[1:1]
2. Description
[0:1]
HasExternalReferences
[0:?]
PartOfComplex
[0:1]
3. Unit
[0:1]
4. VolumeValue
[1:1]
5. Formula
[0:1]
<a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcElementQuantity.htm">IfcElementQuantity</a>:Quantities1-><a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcQuantityVolume.htm">IfcQuantityVolume</a>:IfcQuantityVolume0
<a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcQuantityWeight.htm">IfcQuantityWeight</a>
IfcQuantityWeight 1. Name
[1:1]
2. Description
[0:1]
HasExternalReferences
[0:?]
PartOfComplex
[0:1]
3. Unit
[0:1]
4. WeightValue
[1:1]
5. Formula
[0:1]
<a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcElementQuantity.htm">IfcElementQuantity</a>:Quantities1-><a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcQuantityWeight.htm">IfcQuantityWeight</a>:IfcQuantityWeight0
<a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcQuantityCount.htm">IfcQuantityCount</a>
IfcQuantityCount 1. Name
[1:1]
2. Description
[0:1]
HasExternalReferences
[0:?]
PartOfComplex
[0:1]
3. Unit
[0:1]
4. CountValue
[1:1]
5. Formula
[0:1]
<a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcElementQuantity.htm">IfcElementQuantity</a>:Quantities1-><a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcQuantityCount.htm">IfcQuantityCount</a>:IfcQuantityCount0
<a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcQuantityTime.htm">IfcQuantityTime</a>
IfcQuantityTime 1. Name
[1:1]
2. Description
[0:1]
HasExternalReferences
[0:?]
PartOfComplex
[0:1]
3. Unit
[0:1]
4. TimeValue
[1:1]
5. Formula
[0:1]
<a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcElementQuantity.htm">IfcElementQuantity</a>:Quantities1-><a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcQuantityTime.htm">IfcQuantityTime</a>:IfcQuantityTime0
Length_Quantity
Length Quantity
<a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcQuantityLength.htm">IfcQuantityLength</a>->Length_Quantity
Area_Quantity
Area Quantity
<a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcQuantityArea.htm">IfcQuantityArea</a>->Area_Quantity
Volume_Quantity
Volume Quantity
<a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcQuantityVolume.htm">IfcQuantityVolume</a>->Volume_Quantity
Weight_Quantity
Weight Quantity
<a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcQuantityWeight.htm">IfcQuantityWeight</a>->Weight_Quantity
Count_Quantity
Count Quantity
<a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcQuantityCount.htm">IfcQuantityCount</a>->Count_Quantity
Time_Quantity
Time Quantity
<a href="/IFC/RELEASE/IFC4x3/HTML/lexical/IfcQuantityTime.htm">IfcQuantityTime</a>->Time_Quantity
Figure 4.1.6.3.A Table 4.1.6.3.B