| ifc | <http://standards.buildingsmart.org/IFC/DEV/IFC4_1/OWL> |
| w3id-org | <https://w3id.org> |
| ns | <http://creativecommons.org/ns> |
| owl | <http://www.w3.org/2002/07/owl> |
| rdf | <http://www.w3.org/1999/02/22-rdf-syntax-ns> |
| xsd | <http://www.w3.org/2001/XMLSchema> |
| express | <https://w3id.org/express> |
| ifc4-1 | <http://standards.buildingsmart.org/IFC/DEV/IFC4_1> |
| rdfs | <http://www.w3.org/2000/01/rdf-schema> |
| list | <https://w3id.org/list> |
| vann | <http://purl.org/vocab/vann> |
| dc | <http://purl.org/dc/elements/1.1> |