Situation

Since version 4.3 ADD1, IFC introduced the entity (class) IfcWellKnownText; quoting from the IFC documentation: "A Well Known Text (WKT) literal is a structured textual representation of the definition of a coordinate reference systems according to ISO 19125-1:2004 or ISO 19162:2019." Still quoting from the same page, "This entity is not part of a standardized schema subset or implementation level", and it is not currently used for representing "polylines" (IFC term) composed of successive straight lines, i.e. "linestrings" in the sense of GeoSPARQL.

Works are ongoing (esp. under the IFC Tunnel workgroup), aiming at expanding the compatibility with OGC standards in view of IFC 4.4. [1]

External References

[1] The IFC-Tunnel project – Extending the IFC standard to enable high-quality exchange of tunnel information models: provides background information regarding alignment and its usage.