IFC 4.3.x development

8.21.3.4 IfcTableColumn

Change log

IFC4

added

8.21.3.4.1 Semantic definitions at the entity

An IfcTableColumn is a data structure that captures column information for use in an IfcTable. Each instance defines the identifier, name, description, and units of measure that are applicable to the columnar data associated with the IfcTableRow objects.

The use of IfcTableColumn supersedes the IsHeading flag associated with IfcTableRow.

HISTORY  New entity in IFC4.

8.21.3.4.1 Attributes

#Attribute Type Description
IfcTableColumn
1Identifier OPTIONAL IfcIdentifierThe 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.
2Name OPTIONAL IfcLabel The Name is a human-readable caption for the table column. It is not necessarilly unique.
3Description OPTIONAL IfcText The Description provides human-readable text describing the table column.
4Unit OPTIONAL IfcUnit 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.
5ReferencePathOPTIONAL IfcReference 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.

8.21.3.4.2 Entity inheritance

dot_inheritance IfcTableColumn IfcTableColumn

8.21.3.4.3 Formal representations

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