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Definition from buildingSMART: The IfcConnectionGeometry is used to describe the geometric and topological constraints that facilitate the physical connection of two objects. It is envisioned as a control that applies to the element connection relationships.

NOTE  The element connection relationship normally provides for a logical connection information, by referencing the relating and related elements. If in addition an IfcConnectionGeometry is provided, physical connection information is given by specifying exactly where at the relating and related element the element connection occurs. Using the eccentricity subtypes, the connection can also be described when there is a physical distance (or eccentricity) between the connection elements.

The IfcConnectionGeometry allows for the provision of connection constraints between geometric and topological elements, the following connection geometry/topology types are in scope:

HISTORY  New entity in IFC Release 1.5.
IFC2x Edition 3 CHANGE  The definition of the subtypes has been enhanced by allowing either geometric representation items (point | curve | surface) or topological representation items with associated geometry (vertex point | edge curve | face  surface).

EXPRESS specification:

ENTITY IfcConnectionGeometry
ABSTRACT SUPERTYPE OF (ONEOF(IfcConnectionPointGeometry, IfcConnectionCurveGeometry, IfcConnectionSurfaceGeometry, IfcConnectionPortGeometry));

Inheritance graph

ENTITY IfcConnectionGeometry;
ENTITY IfcConnectionGeometry;