Discovering Spatial and Temporal Links among RDF Data
Authors
Introduction
This is a webpage for the evaluation of the spatial and temporal extensions of the Silk Framework.
You can read more about Silk on its official webpage.
Download and Install
Silk: Download release 2.6.1 and follow the instructions.
Strabon: Download release 3.2.10 and follow the instructions.
Run the Silk Workbench
- Execute: `sbt "project workbench" run`
- In your browser, navigate to 'http://localhost:9000'
Run the Silk Single Machine
- Execute: `sbt "project singlemachine" run -DconfigFile="path-to-the-file"`
Experiments
Below you can find all the relevant input for reproducing the experiments.
Datasets
- Greek Administrative Geography Dataset (download)
- CORINE Land Use/Land Cover Dataset (download)
- Hotspots Dataset (download)
Linkage Rule
<![CDATA[
<?xml version="1.0" encoding="utf-8" ?>
<Silk>
<Prefixes>
<Prefix namespace="http://www.w3.org/1999/02/22-rdf-syntax-ns#" id="rdf"></Prefix>
<Prefix namespace="http://dbpedia.org/resource/" id="dbpedia"></Prefix>
<Prefix namespace="http://www.w3.org/2002/07/owl#" id="owl"></Prefix>
<Prefix namespace="http://schema.org/" id="schema"></Prefix>
<Prefix namespace="http://www.w3.org/2000/01/rdf-schema#" id="rdfs"></Prefix>
<Prefix namespace="http://dbpedia.org/ontology/" id="dbpediaowl"></Prefix>
<Prefix namespace="http://www.opengis.net/ont/geosparql#" id="geo"></Prefix>
<Prefix namespace="http://teleios.di.uoa.gr/ontologies/noaOntology.owl#" id="noa"></Prefix>
<Prefix namespace="http://geo.linkedopendata.gr/corine/ontology#" id="corine"></Prefix>
<Prefix namespace="http://geo.linkedopendata.gr/gag/ontology/" id="gag"></Prefix>
</Prefixes>
<DataSources>
<DataSource type="sparqlEndpoint" id="hcg">
<Param name="pageSize" value="100000"></Param>
<Param name="pauseTime" value="0"></Param>
<Param name="retryCount" value="10"></Param>
<Param name="endpointURI" value="http://localhost:8080/silk_full/Query"></Param>
<Param name="retryPause" value="1000"></Param>
</DataSource>
</DataSources>
<Blocking />
<Interlinks>
<Interlink id="hotspots-corine_gr">
<LinkType>
strdf:intersects
</LinkType>
<SourceDataset dataSource="hcg" var="s">
<RestrictTo>
?s rdf:type noa:Hotspot.
</RestrictTo>
</SourceDataset>
<TargetDataset dataSource="hcg" var="t">
<RestrictTo>
?t rdf:type corine:Area.
?t corine:hasLandUse ?lu.
FILTER (?lu = corine:broadLeavedForest || ?lu = corine:coniferousForest ).
</RestrictTo>
</TargetDataset>
<LinkageRule>
<Compare required="true" weight="1" metric="IntersectsMetric" indexing="true">
<TransformInput function="GeometryTransformer">
<Input path="?s/noa:hasGeometry/noa:asWKT" />
</TransformInput>
<TransformInput function="GeometryTransformer">
<Input path="?t/corine:hasGeometry/corine:asWKT" />
</TransformInput>
<Param name="blockingParameter" value="10.0" />
</Compare>
</LinkageRule>
<Filter />
<Outputs>
<Output type="file">
<Param name="file" value="outputs/HotspotsCorineLinks.nt" />
<Param name="format" value="ntriples" />
</Output>
</Outputs>
</Interlink>
<Interlink id="hotspots-gag">
<LinkType>
strdf:intersects
</LinkType>
<SourceDataset dataSource="hcg" var="s">
<RestrictTo>
?s rdf:type noa:Hotspot.
</RestrictTo>
</SourceDataset>
<TargetDataset dataSource="hcg" var="t">
<RestrictTo>
?t rdf:type gag:Δήμος.
</RestrictTo>
</TargetDataset>
<LinkageRule>
<Compare required="true" weight="1" metric="IntersectsMetric" indexing="true">
<TransformInput function="GeometryTransformer">
<Input path="?s/noa:hasGeometry/noa:asWKT" />
</TransformInput>
<TransformInput function="GeometryTransformer">
<Input path="?t/gag:hasGeometry/gag:asWKT" />
</TransformInput>
<Param name="blockingParameter" value="10.0" />
</Compare>
</LinkageRule>
<Filter />
<Outputs>
<Output type="file">
<Param name="file" value="outputs/HotspotsGagLinks.nt" />
<Param name="format" value="ntriples" />
</Output>
</Outputs>
</Interlink>
</Interlinks>
</Silk>
]]>
Strabon Queries
<![CDATA[
PREFIX noa: <http://teleios.di.uoa.gr/ontologies/noaOntology.owl#>
PREFIX corine: <http://geo.linkedopendata.gr/corine/ontology#>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX strdf: <http://strdf.di.uoa.gr/ontology#>
PREFIX gag: <http://geo.linkedopendata.gr/gag/ontology/>
PREFIX exp: <http://silk.di.uoa.gr/exp/>
CONSTRUCT {?s strdf:intersects ?t.}
WHERE
{
GRAPH exp:hg{
?s rdf:type noa:Hotspot.
?s noa:hasGeometry/noa:asWKT ?sg.
?s strdf:hasValidTime ?st.
}
GRAPH exp:gag{
?t rdf:type gag:Δήμος.
?t gag:hasGeometry/gag:asWKT ?tg.
?t strdf:hasValidTime ?tt.
}
FILTER(geof:sfIntersects(?sg, ?tg) && strdf:intersects(?st, ?tt))
}
---------------------------------------------------------------------------------------------------------
PREFIX noa: <http://teleios.di.uoa.gr/ontologies/noaOntology.owl#>
PREFIX corine: <http://geo.linkedopendata.gr/corine/ontology#>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX strdf: <http://strdf.di.uoa.gr/ontology#>
PREFIX gag: <http://geo.linkedopendata.gr/gag/ontology/>
PREFIX exp: <http://silk.di.uoa.gr/exp/>
CONSTRUCT {?s strdf:intersects ?t.}
WHERE
{
GRAPH exp:hg{
?s rdf:type noa:Hotspot.
?s noa:hasGeometry/noa:asWKT ?sg.
?s strdf:hasValidTime ?st.
}
GRAPH exp:corine{
?t rdf:type corine:Area.
?t corine:hasLandUse ?lu.
FILTER (?lu = corine:broadLeavedForest || ?lu = corine:coniferousForest ).
?t corine:hasGeometry/corine:asWKT ?tg.
?t strdf:hasValidTime ?tt.
}
FILTER(geof:sfIntersects(?sg, ?tg) && strdf:intersects(?st, ?tt))
}
]]>
Publications
P. Smeros and M. Koubarakis. Discovering Spatial and Temporal Links among RDF Data. In the WWW2016 Workshop: Linked Data on the Web (LDOW2016). Montréal, Canada. 11 April, 2016. [pdf]