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The World Wide Web Consortium Linked Building Data Community Group (W3C LBD-CG) hypothesises that the Linked Data models and best practices can be leveraged to achieve this vision in modern web-based applications. In this paper, we introduce the Building Topology Ontology (BOT) as a core vocabulary to this approach. It provides a high-level description of the topology of buildings including storeys and spaces, the building elements they contain, and their web-friendly 3D models. We describe how existing applications produce and consume datasets combining BOT with other ontologies that describe product catalogues, sensor observations, or Internet of Things (IoT) devices effectively implementing BIM Maturity Level\u00a03. We evaluate our approach by exporting and querying three real-life large building models.<\/jats:p>","DOI":"10.3233\/sw-200385","type":"journal-article","created":{"date-parts":[[2020,10,2]],"date-time":"2020-10-02T14:01:52Z","timestamp":1601647312000},"page":"143-161","source":"Crossref","is-referenced-by-count":158,"title":["BOT: The building topology ontology of the W3C linked building data group"],"prefix":"10.1177","volume":"12","author":[{"given":"Mads Holten","family":"Rasmussen","sequence":"first","affiliation":[{"name":"Department of Civil Engineering, Technical University of Denmark, Denmark. E-mail:\u00a0mhoras@byg.dtu.dk"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maxime","family":"Lefran\u00e7ois","sequence":"additional","affiliation":[{"name":"Mines Saint-\u00c9tienne, Univ Lyon, Univ Jean Monnet, IOGS, CNRS, UMR 5516, LHC, Institut Henri Fayol, F-42023 Saint-\u00c9tienne, France. 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