IfcTableColumn

标签：IfcTableColumn provided ReferencePath column table OPTIONAL

IfcTableColumn

实体定义

IfcTableColumn是一种数据结构，用于捕获IfcTable中使用的列信息。每个实例都定义了标识符、名称、描述和度量单位，它们适用于与IfcTableRow对象关联的列数据。

 

IfcTableColumn的使用将取代与IfcTableRow关联的IsHeading标志。

 

IFC4中的新实体。

 

 

 

 

Attribute inheritance

#	Attribute	Type	Cardinality	Description	C
IfcTableColumn
1	Identifier	IfcIdentifier	[0:1]	The Identifier identifies the column within the table. If provided, it must be unique within the table. Columns may be cross-referenced across multiple tables by sharing the same column identifier.	X
2	Name	IfcLabel	[0:1]	The Name is a human-readable caption for the table column. It is not necessarilly unique.	X
3	Description	IfcText	[0:1]	The Description provides human-readable text describing the table column.	X
4	Unit	IfcUnit	[0:1]	The Unit indicates the unit of measure to be used for this column's data. If not provided, then project default units are assumed. If ReferencePath is provided, the the unit must be of the same measure as the referenced attribute.	X
5	ReferencePath	IfcReference	[0:1]	The ReferencePath indicates a relative path to the object and attribute for which data within this column is to be applied. For constraints, such path is relative to the IfcObjectDefinition associated by IfcRelAssociatesConstraint.RelatedObjects. For a constraint to be satisified, exactly one row of the table must match the referenced object for all columns where the ReferencePath attribute is set.	X

 

 

EXPRESS Specification

ENTITY IfcTableColumn;
  Identifier : OPTIONAL IfcIdentifier;
  Name : OPTIONAL IfcLabel;
  Description : OPTIONAL IfcText;
  Unit : OPTIONAL IfcUnit;
  ReferencePath : OPTIONAL IfcReference;
END_ENTITY;

 

 

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标签：IfcTableColumn,provided,ReferencePath,column,table,OPTIONAL
From： https://www.cnblogs.com/herd/p/16990663.html