(2020-05-25) Ghislain Atemezing: Ontology automatically generated from the EXPRESS schema 'IFC4_ADD1' using the 'IFC-to-RDF' converter developed by Pieter Pauwels (pipauwel.pauwels@ugent.be), based on the earlier versions from Jyrki Oraskari (jyrki.oraskari@aalto.fi) and Davy Van Deursen (davy.vandeursen@ugent.be). Need to add more vocabularies imported such as https://w3id.org/express and https://w3id.org/list