Under the term sustainable infrastructure buildings, we have defined and clustered the three main classes of bridge (transportation), building (living and education) and wastewater treatment. Accordingly, the buildings school and apartmentbuiling are under the heading of buildings, since here are the most parallels between the individual systems.
We have combined the main material of the apartment building system with the school system, since this class can be applied to school just as well, so that it is now a sub-class of both classes. We also added clay to the sub-class, as it is a co2 friendly alternative to concrete, and changed concrete to recycled concrete.
For the bridge, we added the sub-class Transport Passengers under the class FunctionalUsage to create a link between the buildings school and apartment and the bridge. This shows that the bridge is not only responsible for transporting goods, but also provides sustainable transportation for people.
The wastewater treatment plant was extended by the sub-class Wastewatersource, as this is the connecting link to the buildings Apartment and school. The wastewater that is generated in the buildings is treated in the wastewater treatment plant and reused in the agricultural area.
Since all our individual systems are very specific in their use and characterization, we decided to keep the links to a sufficient minimum in order not to cut away the functionality of the individual systems and to keep the ontology easy to understand for the reader and user.

Figure 2: Result of our Combined Ontology

Ontology Link: sui-ontology