I'm attempting to use SPIN to perform some inferencing about sensor
observations.
Observations are represented using RDF as follows...
<rdf:RDF
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#";
xmlns:j.0="http://www.w3.org/2005/Incubator/ssn/ssnx/ssn#";
xmlns:owl="http://www.w3.org/2002/07/owl#";
xmlns:j.2="http:// ... /"
xmlns:j.1="http:// ... /Quality#"
xmlns:xsd="http://www.w3.org/2001/XMLSchema#";
xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#";
xmlns:j.3="http://www.w3.org/2003/01/geo/wgs84_pos#"; >
<rdf:Description rdf:about="http:// ...
/5f875a0b-9814-4f93-bc60-c5b7255d7094">
<rdf:type rdf:resource="http:// ... /LocationDeviceValue"/>
<j.3:lat>57.125</j.3:lat>
<j.3:long>-2.10776</j.3:long>
<j.2:accuracy>5.0</j.2:accuracy>
</rdf:Description>
<rdf:Description rdf:about="http:// ...
/24268b0d-e933-4af2-9b6a-a8a8d7c2aeab">
<rdf:type rdf:resource="http:// ... /LocationDeviceObservation"/>
<j.0:observationResultTime>1314195157000</j.0:observationResultTime>
<j.0:observationSamplingTime>1314195157000</j.0:observationSamplingTime>
<j.2:serverTime>1347544030791</j.2:serverTime>
<j.1:dataAge>33348885</j.1:dataAge>
<j.0:featureOfInterest>http:// ...
/6e11eeeb-57ca-4ef5-b75b-a3b7eb599713</j.0:featureOfInterest>
<j.0:observedBy>http:// ...
/ecf477a9-8c37-4986-a538-9cc7b6faf9ef</j.0:observedBy>
<j.0:sensingMethodUsed>http:// ... /sensing/1</j.0:sensingMethodUsed>
</rdf:Description>
</rdf:RDF>
To test, I have authored the following SPIN rule...
# Test rule...
*CONSTRUCT* {
*?this* sensors:testProperty "It works..." .
}
*WHERE* {
*?this* a sensors:LocationDeviceObservation .
*NOT* *EXISTS* {
*?this* sensors:testProperty ?o .
} .
}
Please note that the j.2 and sensors: namespace both point to same location.
I'm trying to execute the rule programmatically in Java:
rules = ModelFactory.createOntologyModel(OntModelSpec.OWL_MEM);
try
{
rules = FileManager.get().loadModel(QUALITY_RULE_PATH, "N3");
}
catch(Exception ex)
{
System.out.println("QualityAssessment: Failed getting rules: " + ex);
}
SPINModuleRegistry.get().init();
OntModel assessment = ModelFactory.createOntologyModel(OntModelSpec.OWL_MEM
);
OntModel nTriples = ModelFactory.createOntologyModel(OntModelSpec.OWL_MEM);
//Add observation, rules, and nTriple models to assessment
assessment.add(observation);
assessment.add(rules);
assessment.add(nTriples);
try
{
SPINModuleRegistry.get().registerAll(assessment, null);
SPINInferences.run(assessment, nTriples, null, null, false, null);
}
catch (Exception ex)
{
ex.printStackTrace();
}
System.out.println("QualityAssessment: " + nTriples.size() + " Inferred
triples");
This is continually returning 0 inferred triples and I can't work out why.
It's highly likely that I have a problem with my RDF but if it's an easy
fix then I can see it for looking.
Thanks,
Chris
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