@@ -79,4 +79,6 @@ The device has coordinates relative to the factory that are computed as follows:
...
@@ -79,4 +79,6 @@ The device has coordinates relative to the factory that are computed as follows:
## Relations between sensing/actuating devices, observable/actuatable properties, and property/action affordances
## Relations between sensing/actuating devices, observable/actuatable properties, and property/action affordances
We can relate properties of the real world, devices that sense or act upon those properties, and the thing APIs that can get access to the observations or actions of/on these physical properties. For this, we are using the [SOSA/SSN ontology](https://www.w3.org/TR/vocab-ssn/).
We can relate properties of the real world, devices that sense or act upon those properties, and the thing APIs that can get access to the observations or actions of/on these physical properties. For this, we are using the [SOSA/SSN ontology](https://www.w3.org/TR/vocab-ssn/). In particular, this allows one to determine what sensor observes a certain property of a particular feature of interest. In the case of the production line, we may want to distinguish the presence sensor at the beginning of a conveyor belt and at the one at the end. These observe presence at different locations, that are identified in the knowledge graph. The following diagram shows how this is done for the input and output areas of the filling workshop.
