IfcPhysicalComplexQuantity
复杂物理量IfcPhysicalComplexQuantity是一个实体，它包含一组单个数量度量值（如IfcPhysicalSimpleQuantity的子类型所定义的），这些值都适用于元素的给定组件或方面。
示例：分层图元（如墙）可能有多个材质层，每个层都有单独的数量，如迹线面积、侧面积和体积。IfcPhysicalComplexQuantity的实例将对这些单独的量（由IfcPhysicalSimpleQuantity的子类型给定）进行分组，并使用“名称”属性根据材质图层名称对它们进行命名。然后，Discrimination属性将是“layer”。
作为IfcBuildingElement子类型的单个实体的“数量使用定义”一节为使用Name和Discrimination属性来描述复杂数量提供了指导。
IFC2x2附录1中增加的新实体。
如果已添加实体IfcPhysicalComplexQuantity，则更改实体IFC2x2附录1。保证了基于文件的交换的向上兼容性。
Formal Propositions
| Rule | Description |
|---|---|
| NoSelfReference |
IfcPhysicalComplexQuantity不应在HasQuantity列表中引用自身。 |
| UniqueQuantityNames |
集合hasQuantilities中的每个单独IfcPhysicalQuantity都应具有唯一的Name属性值。 IFC4历史新规则 |
Attribute inheritance
| # | Attribute | Type | Cardinality | Description | C |
|---|---|---|---|---|---|
| IfcPhysicalQuantity | |||||
| 1 | Name | IfcLabel | [1:1] | Name of the element quantity or measure. The name attribute has to be made recognizable by further agreements. | X |
| 2 | Description | IfcText | [0:1] | Further explanation that might be given to the quantity. | X |
| HasExternalReferences | IfcExternalReferenceRelationship @RelatedResourceObjects |
S[0:?] | Reference to an external reference, e.g. library, classification, or document information, that is associated to the quantity. | X | |
| PartOfComplex | IfcPhysicalComplexQuantity @HasQuantities |
S[0:1] | Reference to a physical complex quantity in which the physical quantity may be contained. | X | |
| IfcPhysicalComplexQuantity | |||||
| 3 | HasQuantities | IfcPhysicalQuantity | S[1:?] | Set of physical quantities that are grouped by this complex physical quantity according to a given discrimination. | X |
| 4 | Discrimination | IfcLabel | [1:1] | Identification of the discrimination by which this physical complex property is distinguished. Examples of discriminations are 'layer', 'steel bar diameter', etc. | X |
| 5 | Quality | IfcLabel | [0:1] | Additional indication of a quality of the quantities that are grouped under this physical complex quantity. | X |
| 6 | Usage | IfcLabel | [0:1] | Additional indication of a usage type of the quantities that are grouped under this physical complex quantity. | X |
EXPRESS Specification
ENTITY IfcPhysicalComplexQuantity SUBTYPE OF (IfcPhysicalQuantity); HasQuantities : SET [1:?] OF IfcPhysicalQuantity; Discrimination : IfcLabel; Quality : OPTIONAL IfcLabel; Usage : OPTIONAL IfcLabel; WHERE NoSelfReference : SIZEOF(QUERY(temp <* HasQuantities | SELF :=: temp)) = 0; UniqueQuantityNames : IfcUniqueQuantityNames(HasQuantities);END_ENTITY;
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