ifc4x3 IfcActorRole
定义：
该实体表示由行为者（个人、组织或与组织相关的人员）执行的角色。
注：Role属性枚举值的角色列表永远不可能完整。因此，使用枚举值USERDEFINED，用户可以提供任何角色作为属性UserDefinedRole的值。
注：根据ISO 10303-41中定义的组织角色和人员角色改编的实体。
IFC1.5.1中的新实体。
Attributes
| # | Attribute | Type | Description |
|---|---|---|---|
| IfcActorRole (4) | |||
| 1 | Role | IfcRoleEnum |
The name of the role played by an actor. If the Role has value USERDEFINED, then the user defined role shall be provided as a value of the attribute UserDefinedRole. |
| 2 | UserDefinedRole | OPTIONAL IfcLabel |
Allows for specification of user defined roles beyond the enumeration values provided by Role attribute of type IfcRoleEnum. When a value is provided for attribute UserDefinedRole in parallel the attribute Role shall have enumeration value USERDEFINED. |
| 3 | Description | OPTIONAL IfcText |
A textual description relating the nature of the role played by an actor. |
| HasExternalReference | SET [0:?] OF IfcExternalReferenceRelationship FOR RelatedResourceObjects |
Reference to external information, e.g. library, classification, or document information, which is associated with the actor role. IFC4-CHANGE New inverse attribute. |
|
Table 8.1.3.1.M
Formal propositions
| Name | Description |
|---|---|
| WR1 |
If the attribute Role has the enumeration value USERDEFINED then a value for the attribute UserDefinedRole shall be asserted. |
|
|
Formal representation
ENTITY IfcActorRole; Role : IfcRoleEnum; UserDefinedRole : OPTIONAL IfcLabel; Description : OPTIONAL IfcText; INVERSE HasExternalReference : SET [0:?] OF IfcExternalReferenceRelationship FOR RelatedResourceObjects; WHERE WR1 : (Role <> IfcRoleEnum.USERDEFINED) OR ((Role = IfcRoleEnum.USERDEFINED) AND EXISTS(SELF.UserDefinedRole)); END_ENTITY;
参考：
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标签：USERDEFINED,attribute,UserDefinedRole,value,IfcRoleEnum,Role,ifc4x3,IfcActorRole From： https://www.cnblogs.com/herd/p/17087202.html