Defined in File Ifc4.h
IfcGroup: public Ifc4::IfcObject¶
IfcGroup is an generalization of any arbitrary group. A group is a logical collection of objects. It does not have its own position, nor can it hold its own shape representation. Therefore a group is an aggregation under some non-geometrical / topological grouping aspects.
EXAMPLE An example for a group is a system, since it groups elements under the aspect of their role, regardless of their position in a building.
A group can hold any collection of objects (beingproducts, processes, controls, resources, actors or other groups). Thus groups can be nested. An object can be part of zero, one, or many groups. Grouping relationships are not required to be hierarchical nor do they imply a dependency.
A group can be exchanged without having already objects within the group collection.
HISTORY New entity in IFC Release 1.0.
IFC2x4 CHANGE The inverse IsGroupedBy relationship is set to 0..n
Objects: included in group using IfcRelAssignsToGroup
Groups are assigned to other objects (such as a process or a resource) by the relationship object that refers to the corresponding object:
Groups can be subjected to a control. The control information is then assigned:
Controls: affecting the group using IfcRelAssignsToControl