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328 Semantic as an Interoperability Enabler in Internet of Things
of service_identification, service_functionality, security_profile and
grounding.
• Service_identification provides all the information that will let
identify uniquely a service, from the set of services in an ontology
repository. This identification is composed of three objects: service_name,
the name allocated to the service, service_explanation,
a detailed explanation of the functionality of the service, and service_owner,
a person, entity or process name.
• Service_funcionality provides information about the data interchanged
with the service. Input_description is a formal description
of the input information that user (process or other) must provide
to the service in a request. In the same way, output_description is
the description of the output information generated by the service.
Some services need configuration data, prior to a request that will
customize the service delivery. The description of the configuration
parameters is provided by the precondition_description.
• Grounding is the specification of the protocol that will support the
interaction between the service and the application. The protocol
could be a well-known one or could be ad-hoc for a specific application.
In any case, it will be compliant with the service features.
• Security_profile is the description of the security framework that
supports a specific service.
9.2.2.2 Context
An important element for a service oriented middleware managing information
models based on ontologies is the specification of the context condition under
which the service is provided. It is not the same to provide a temperature
service indoor or outdoor or a heart-rate service at sea level that on top of a
mountain. The context information can be stored in the ontology repository
and can be used by processes to provide the service accurately.
The context class is composed of location, motion, geo_coordinates,
smartSpace and context_criticality, depicted in the following figure.
Location has two subclasses, indoor_location and outdor_location. It lets
know if the service is provide in an indoor location, such us a house or a public