Quality Ontology

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Abstract

The Quality Ontology is used to represent the quality of information for data streams in smart cities. The annotated data streams are represented with the Stream Annotation Ontology. To provide information about the provenance of the streams parts of the PROV-O ontology are used.

Status of this Document

This is a work in progress and changes may be made. Comments are very welcome, please send them to Editor. Thank you.

Appendixes

1. Introduction

The Quality Ontology is optimised to get used in combination with the Stream Annotation Ontology. The figure below depicts the workflow with the combination of both ontologies and the inclusion of the Complex Event Service ontology as they are combined within the EU FP7 project CityPulse.

The figure below depicts the Quality Ontology in detail. It illustrates the combination with the SAO and the PROV-O. It allows to annotate StreamData of the SAO with Quality. The Quality itself has five categories with subcategories to describe the attributes of the annotated data stream regarding its quality. In addition it provides a concept of trustworthiness for data sources. This concept is realised by two additional object properties hasProvenance and hasReputation to link the StreamData with an Agent as the owner and its Reputation.

2. Quality Ontology at a glance

An alphabetical index of Quality Ontology terms, by class (concepts) and by property (relationships, attributes), are given below. All the terms are hyperlinked to their detailed description for quick reference.

3. Exemplification

The following example depicts a data stream segment for traffic data provided by the Open Data Aarhus platform.

Example 1


@prefix : <http://ict-citypulse.eu/experiments/Experiment1/> .
@prefix prov: <http://purl.org/NET/provenance.owl#> .
@prefix qoi: <http://purl.oclc.org/NET/UASO/qoi/> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix sao: <http://purl.oclc.org/NET/UNIS/sao/sao#> .
@prefix ssn: <http://purl.oclc.org/NET/ssnx/ssn#> .
@prefix tl: <http://purl.org/NET/c4dm/timeline.owl#> .
@prefix xml: <http://www.w3.org/XML/1998/namespace> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

:segment-sample-1 a sao:Segment ;
    qoi:hasQuality :age-sample-1,
        :completeness-sample-1,
        :correctness-sample-1,
        :frequency-sample-1 ;
    ssn:observationResultTime [ a tl:Interval ;
            tl:at "2014-08-01T09:00:00"^^xsd:dateTime ;
            tl:duration "PT00H05M"^^xsd:duration ] ;
    prov:hasProvenance :R_ID158355 .

:age-sample-1 a qoi:Age ;
    qoi:value "1.0"^^xsd:float .

:completeness-sample-1 a qoi:Completeness ;
    qoi:value "1.0"^^xsd:float .

:correctness-sample-1 a qoi:Correctness ;
    qoi:value "0.99"^^xsd:float .

:frequency-sample-1 a qoi:Frequency ;
    qoi:value "1.0"^^xsd:float .

:R_ID158355 a prov:SoftwareAgent .

4. Cross-reference for Quality Ontology classes and properties

Class: qoi:Accuracy

URI: http://purl.oclc.org/NET/UASO/qoi#Accuracy

Accuracy - Category to describe the accuracy of stream data.

sub-class-of:: qoi:Quality

Quality Ontology