## 1 Introduction
Comparatively, without digitizing the infrastructure components and the production part of a building or structure, such as ventilation, electricity, or water supply systems, we will not be able to adequately model and analyze their interaction and performance [10; 19; 20]. Without digitizing IFI requirements, such as room utilization, cross-departmental collaboration, or user needs, we will not be able to adequately model and evaluate the effectiveness and usability of IFIs. Until now, BIM, as a design tool, assumed that requirements, functions, and processes are not formalized or digitized; they are only in the head of the design subject based on regulatory documents and customer requirements. The understanding of IFI information modeling at the moment rested on its development as an understanding of the technology that describes the _objects_ of the physical world: building structures, engineering networks, landscaping elements, etc. [16; 21; 22]. If BIM developed systematically, then not only objects of the physical world would be digitalized. The principles of application of BIM described in ISO 19650 [23] are currently insufficient for a modern industrial enterprise because they consider digital technologies for buildings and structures not consistent with the digital technologies of the enterprise, such as manufacturing technologies. At the same time, production technologies are evolving very quickly in Industry 4.0, and BIM technologies describe more conservative entities. Therefore, new principles of the operation of the infrastructure of industrial enterprises are required--anecessary basis for an enterprise that seeks to defend itself competitively in the market. At the same time, it is obvious that in the gas_cal world, there are not only objects. Physical objects and their systems can perform certain _functions_, such as electricity, gas, and water supply, ensuring the strength of structures, maintaining certain microclimate parameters, and others [2; 4; 17]. In addition, within the framework of a building or structure, various _processes_ can take place: air conditioning, the movement and heat dissipation of equipment and people, dynamic loads from equipment, and others. Finally, any existing industrial enterprise assumes the requirements for IFI, ranging from the economical and investment characteristics of the project to the requirements of production or design parameters. It should not be forgotten that in addition to the _objects_, _functions_, _processes_, _and_ requirements of the physical appearance of IFI, there are _relationships_ between these entities. For example, microclimate _requirements_ affect the _processes_ of heating, ventilation, and air conditioning and, at the same time, depend on them. And the _functions_ performed via building structures and engineering networks directly depend on the parameters of these _objects_. Modern approaches require that all digital technologies of the enterprise develop harmoniously since, at the moment, they are quite isolated from each other. BIM technology cannot evolve in a vacuum to be in demand, as it requires the interaction and collaboration of various stakeholders. The smooth integration of BIM into the process of the digital transformation of an enterprise is successful only when all participants in the process actively interact and exchange information in a single digital environment. Only such cooperation allows you to maximize the potential of BIM. Without collaboration and data sharing, BIM technology will not be able to realize its full potential and be in demand. Consequently, the **purpose** of this study is the principles of the joint application of BIM technologies and MBSE via the decomposition and subsequent formalization and digitization of the _requirements_, _functions_, _components_, _processes_, _and relationships_ between them related to a certain IFI.