SSN Base
From Semantic Sensor Network Incubator Group
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Data
The two figures below shows two examples where the SSN ontology is used in conjunction with the DUL ontology to manage data.
Figure 5.21 shows how a ssn:ObservationValue which is a sub-class of DUL:Region is attached to a ssn:SensorOutput.
Figure 5.21 - Using ssn:hasValue for observation results
Figure 5.22 shows how an example of how data value can be attached to a ssn:Property (here a ssn:OperatingPowerRange).
This example uses DUL:Amount, a subclass of DUL:Region which is the DUL class to handle a quantity value. The DUL:UnitOfMeasure can also be defined. In DUL, Units of measure are conceptualized as parameters on regions and defined as a subclass of DUL:Parameter.
Figure 5.22 - Using ssn:hasValue to add data to a operational restriction property
ConstraintBlock (Condition)
ssn:Condition is used to specify ranges for qualities that act as conditions on a system/sensor's operation. For example, wind speed of 10-60m/s is expressed as a condition linking a quality, wind speed, a unit of measurement, metres per second, and a set of values, 10-60, and may be used as the condition on a MeasurementProperty, for example, to state that a sensor has a particular accuracy in that condition.
ssn:inCondition describes the prevailing environmental conditions for Measurement Capabilites, Operating Conditions and Survival Ranges. Used for example to say that a sensor has a particular accuracy in particular conditions (see also the MeasuringCapability module documentation).
Figure 5.23 - Classes using ssn:Condition in the SSN Ontology
This is called 'Storage temperature' on the WM30 data sheet. The intention is likely to be the same as SurvivalRange: i.e. if the device is stored outside this temperature range it no longer works as specified.
In any case, for the purposes of the example it shows the use of ssn:Condition to specify a SurvivalRange.
<owl:Ontology rdf:about="http://purl.oclc.org/NET/ssnx/meteo/WM30">
...
<owl:Class rdf:about="http://purl.oclc.org/NET/ssnx/meteo/WM30#WM30_SurvivalRange">
<rdfs:subClassOf rdf:resource="http://purl.oclc.org/NET/ssnx/ssn#SurvivalRange"/>
<rdfs:subClassOf>
<owl:Restriction>
<owl:onProperty rdf:resource="http://purl.oclc.org/NET/ssnx/ssn#inCondition"/>
<owl:someValuesFrom>
<owl:Class>
<owl:intersectionOf rdf:parseType="Collection">
<owl:Class>
<owl:oneOf rdf:parseType="Collection">
<rdf:Description rdf:about="http://purl.oclc.org/NET/ssnx/qu/dim/Temperature"/>
</owl:oneOf>
</owl:Class>
<owl:Restriction>
<owl:onProperty rdf:resource="http://purl.oclc.org/NET/ssnx/ssn#hasValue"/>
<owl:someValuesFrom>
<owl:Class>
<owl:intersectionOf rdf:parseType="Collection">
<rdf:Description rdf:about="http://purl.oclc.org/NET/ssnx/meteo/WM30#ValueRange"/>
<owl:Restriction>
<owl:onProperty rdf:resource="http://purl.oclc.org/NET/ssnx/meteo/WM30#unitOfMeasure"/>
<owl:someValuesFrom>
<owl:Class>
<owl:oneOf rdf:parseType="Collection">
<rdf:Description rdf:about="http://purl.oclc.org/NET/ssnx/qu/unit/degreeCelsius"/>
</owl:oneOf>
</owl:Class>
</owl:someValuesFrom>
</owl:Restriction>
<owl:Restriction>
<owl:onProperty rdf:resource="http://purl.oclc.org/NET/ssnx/meteo/WM30#hasRangeMaxValueInclusive"/>
<owl:hasValue rdf:datatype="&xsd;float">65.0</owl:hasValue>
</owl:Restriction>
<owl:Restriction>
<owl:onProperty rdf:resource="http://purl.oclc.org/NET/ssnx/meteo/WM30#hasRangeMinValueInclusive"/>
<owl:hasValue rdf:datatype="&xsd;float">-60.0</owl:hasValue>
</owl:Restriction>
</owl:intersectionOf>
</owl:Class>
</owl:someValuesFrom>
</owl:Restriction>
</owl:intersectionOf>
</owl:Class>
</owl:someValuesFrom>
</owl:Restriction>
</rdfs:subClassOf>
</owl:Class>
Figure 5.24 - ssn:Condition
