data cube interface

Copyright 2009 Digital Enterprise Research Institute. All rights reserved.

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Data Cube Interface Gofran Shukhair

Email: firstname.lastname@deri.org

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A semantic web application for publishing statistical linked data (expressed by RDF Data Cube

Vocabulary).

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Use Cases

For a publisher to enable de-referencing his/her data in a fine grained human-readable interface

It can be used by another party different from the publisher to browse the data

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Features (1) 

Requesting the application through this form of the url

    ./index.php?uri=<observation_uri>&endpoint=<endpoint_url>

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Features (2) 

Show the requested observation value and all the related information defined in the triple store behind the endpoint

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Features (3) 

Navigate between the related observation (by changing the value of any dimension/measure)

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Features (4) 

Book-markable urls for all the dataset components

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Features (5) 

TO DO...tag cloud showing values of each dimension corresponding the number of occurrence in the data set

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Features (6)

Faceted search on data set by choosing the values of each dimension

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Assuming ..

The data is expressed in RDF Data Cube Vocabulary (following the recommendations mentioned in http://publishing-statistical-data.googlecode.com/svn/trunk/specs/src/main/html/cube.html )  

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Assuming ..

The data cube vocabulary components should be expressed in the following way for the application: Data Structure Definition Dataset Component Properties

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Data Structure Definition

The order properties are optional No preference on expressing a slice structure (what

is important is using the data cube components properties as showed qb:dimension,qb:measure,qb:attribute)

:dsd-co-slice a qb:DataStructureDefinition ; qb:component [qb:dimension :refArea; qb:order 1], [qb:dimension :refPeriod; qb:order 2; qb:componentAttachment qb:slice], [qb:dimension :instrument; qb:order 3; qb:componentAttachment qb:slice], [qb:dimension :crimeType; qb:order 4], [qb:measure :numberOfInstrumentOffences], [qb:measure :percentageOfInstrumentOffences], [qb:dimension qb:measureType], [qb:attribute sdmx-attribute:unitMeasure; qb:componentAttachment qb:DataSet]; qb:sliceStructure :sliceByRegionAndCrime

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Dataset

The dataset instance should have the type qb:DataSet The dataset instance should be annotated using rdfs:label,

rdfs:comment The dataset instance date, subject and publisher should be

expressed using Dublin core (as recommended in the specification)

The publisher should be of a type org:Organization and/or foaf:Agent

:crime_dataset a qb:DataSet; rdfs:label "Knife and sharp instrument offences"@en; rdfs:comment " recorded by the police for selected offences, 2008/091"@en; dcterms:date "2010-08-11"^^xsd:date; dcterms:subject "instrument offences"@en; dc:publisher :organization; qb:structure :dsd-co-slice ; sdmx-attribute:unitMeasure :offence; qb:slice :slice. :organization a org:Organization, foaf:Agent; rdfs:label "Epimorphics Ltd" .

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Component Properties (Measure)

Annotated with rdfs:label , rdfs:comment

:numberOfInstrumentOffences a rdf:Property, qb:MeasureProperty; rdfs:label "number Of Instrument Offences"@en; rdfs:subPropertyOf sdmx-measure:obsValue; rdfs:range xsd:decimal .

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Component Properties (Dimension)

Annotated with rdfs:label , rdfs:comment Codelists should be used (recommended)

:refArea a rdf:Property, qb:DimensionProperty; rdfs:label "reference area"@en; rdfs:subPropertyOf sdmx-dimension:refArea; rdfs:range co-code:Area; qb:concept sdmx-concept:refArea .

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Component Properties (Attribute)

Annotated with rdfs:label , rdfs:comment

:offence a skos:Concept; skos:prefLabel "Offence"@en ; skos:notation "Offence" ; owl:sameAs <http://dbpedia.org/resource/criminal_offence>.