PositioningElement which provides a Linear Referencing System for locating PhysicalElements. An Alignment shall be continuous, non-branching, and non-overlapping. If it is a Project Alignment, it is for a single alternative, as specified by its owning ProjectPart.

Note: this concept has been commonly defined between OGC LandInfra and bSI.

Data model	Concept name	Definition
OGC LandInfra	Alignment	PositioningElement which provides a Linear Referencing System for locating PhysicalElements. An Alignment shall be continuous, non-branching, and non-overlapping. If it is a Project Alignment, it is for a single alternative, as specified by its owning ProjectPart.
IFC 4.4+	Alignment	Same as OGC LandInfra

https://github.com/opengeospatial/Geotech/issues/44