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9.2 Semantics as an Interoperability Enabler 331
Fig. 9.7 Device/Actuator class inside the ontology.
Device/Actuator describes a device or actuator at a hardware level, describing
its features. It is outlined in Figure 9.7. It must be published in an ontology
repository in order to be consulted by final applications. The Device/Actuator
class is composed by the classes:
• DeviceName shows the common name of this device.
• Id identifies the device uniquely. If the device is a virtual entity
the Id class will be equal to the attribute “virtual” and the rest of
classes would appear empty.
• BatteryLevel indicates the battery level of the device or actuator.
Description shows a brief description about the device presenting
its characteristics.
• Manufacturer is the manufacturer of the device.
• Location is a class that represents where the device is. It is composed
by three subclasses: PlaceId (is a common name of the location),
Latitude and Longitude.
• TechnologyRF represents the technology used by the device in the
communication, for example Bluetooth, Zigbee, Wi-Fi, etc. Finally
the device can indicate its battery level using the class BatteryLevel.
Resources class represents the resources offered by the class Device/
Actuator. It has one subclass called Agent. This class represents a piece of
software which can offer one or more services. The same Device/Actuator