An Open API is a publicly documented programming interface that allows external developers to integrate with a system without requiring internal access. It specifies which data and functions a system provides and how they can be accessed. In building services engineering, it enables control and consumption data to be linked with other systems, thereby reducing dependence on a single supplier.
What is an Open API?
An Open API is an open interface whose structure and usage are documented and accessible. This enables third parties to integrate with a system and incorporate its data or functions into their own applications. The opposite is a closed interface, which only the manufacturer itself can use. Open interfaces are regarded as a key criterion for the future-proofing of a solution, as they prevent a building from being permanently tied to a single system.
What is an open API used for in building services engineering?
In building services, an Open API facilitates the integration of control and consumption data into other systems, such as CAFM, energy management systems, an accounting system or in-house analyses. This means a building is not tied to a single piece of software but can be flexibly networked. For operators with a heterogeneous system landscape, this is a practical advantage, as existing and new systems can be connected via the interface rather than having to transfer data manually.
What is the difference between Open API and the OpenAPI Specification?
In a general sense, Open API refers to an open, accessible interface. The OpenAPI Specification, on the other hand, is a specific technical standard for describing REST interfaces in a uniform and machine-readable way. The terms sound almost the same, but they mean different things: one is a principle of openness, the other a format for the technical documentation of interfaces.
In practice, open interfaces are often described using the OpenAPI Specification. For operators, the practical implications are particularly important: an open, well-documented interface reduces dependence on a single provider and makes it easier to expand the system later or connect it to new applications. It is therefore a criterion for the investment security of a solution, as it prevents a change or expansion from failing due to a lack of access.
Related terms
Quellen & weiterführende Informationen:
- Betterspace: better.integrations
- Betterspace: Schnittstellen für mehr Effizienz und Vernetzung
- OpenAPI Initiative: What is OpenAPI?