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9.2 Semantics as an Interoperability Enabler 325<br />

semantic-based registry would be enabled to answer semantic requests regarding<br />

concepts in the supported ontologies: e.g. list temperature sensors in room<br />

4304 or get detailed information of sensor #43. Besides, ontologies are also<br />

envisioned for mapping devices and its mandatory services. For instance, all<br />

devices measuring temperature must at least provide access to its sampled<br />

measures by means of a specific service, and a device controlling an engine<br />

speed must at least provide a service for modifying the new desired speed.<br />

There is a wide spectrum of ontologies describing concepts, and the relations<br />

among them, regarding main elements in an Internet of Things system:<br />

devices, services and domain-specific applications (applications for smart<br />

grids, smart cities, building management, etc.). Following, a brief description<br />

of ontologies that are becoming more influential for classifying, describing<br />

and mapping devices and services.<br />

9.2.1 Semantic Sensor Network<br />

Semantic Sensor Network (SSN) is an ontology for describing sensors and<br />

sensor networks developed in an OWL-DL language. The SSN ontology is<br />

able to specify the capabilities of sensors, the measurement processes and<br />

the resultant observations. It can be aligned with other ontologies which are<br />

specialized in particular contexts or domains.<br />

SSN ontology has been developed by the W3C Semantic Sensor Network<br />

Incubator Group (SSN-XG). First, the core concepts and relations were<br />

developed (sensors, features, properties, observations, and systems). Then<br />

measuring capabilities, operating and survival restrictions, and deployments<br />

were added in turn. Finally, the alignment to DOLCE-UltraLite (DUL) and the<br />

realization of the core Stimulus-Sensor-Observation (SSO) ontology design<br />

pattern [20] were done.<br />

The ontology can be used for a focus on any (or a combination) of a number<br />

of perspectives:<br />

• A sensor perspective, with a focus on what senses, how it senses,<br />

and what is sensed.<br />

• A data or observation perspective, with a focus on observations and<br />

related metadata.<br />

• A system perspective, with a focus on systems of sensors.

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