1 Introduction  
2 Research Methodology  
3 Context and Background  
3.1 Digitization of Building Data  
3.2 The Advent of Semantic Modeling Technologies in Building’s Operation Phase  
3.3 Ontologies and Semantic Web  
3.4 Identifying Core Concepts in Building Operational Ontologies  
4 Semantic Models  
4.1 Core Semantic Models  
4.2 Others  
5 Identifying Usecase Scenarios on the Application of Ontologies  
5.1 Single-Ontology Use Case Scenarios  
5.2 Two-Ontology Use Case Scenarios  
5.3 Multiple-Ontology Use Case Scenarios  
6 Discussion on Identified Limitations and Forthcoming Steps  
7 Conclusions