This presentation provides an overview of the (real-time) Linked Open Data that is published by the City of Ghent

1. Stad Gent linkt Dataimage: beeldbank.stad.gent
Thimo Thoeye
Stad Gent
Dienst Data en Informatie
thimo.thoeye@stad.gent
OSLO²
31 maart 2017
VAC Lovelinggebouw

2. Informatie delen

3. Open Data

4. Linked Open Data

5. Waarom Linked Open Data?

6. image: 5stardata.info

7. The Semantic Web
A new form of Web content that is
meaningful to computers will unleash
a revolution of new possibilities
by TIM BERNERS-LEE, JAMES
HENDLER and ORA LASSILA
Scientifc American, May 2001
http://www-sop.inria.fr/acacia/cours/essi2006/Scientific%20American_%20Feature%20Article_%20The%20Semantic%20Web_%20May%202001.pdf

8. Vendor lock-in
1. data eigenaarschap
2. structuur data begrijpen
3. interfaces definiëren
4. data hergebruiken

9. Interne communicatie

10. Intern

11. Inter-gouvernmenteel?

12. Welke Data?

13. Personen

14. Diensten
CPSV-AP
OSLO
Schema.org
Eigen NAL’s voor
Doelgroepen
Input Types
Rule Types
image: beeldbank.stad.gent
vocabularies: https://github.com/ghentlivinglab/Vocabularies

15. Evenementen
i.s.m. Uit In Vlaanderen
Openingsuren!!

16. Organisaties
FOAF
Gentse Stadsdiensten
Maar ook andere organisaties
En andere overheden (zie GitHub)
Op de website via http://schema.org/sourceOrganization
Inzicht in organigram
vocabularies: https://github.com/ghentlivinglab/Vocabularies

17. Parkeerplaatsen
Real-time Linked Open Data:
● http://vocab.datex.org
● http://linked.open.gent/parking
● http://codepen.io/pietercolpaert/pen/wgoPNV

18. Plaatsen

19. http://oasis.team
http://opensummerofcode.be
Hoe maken we dit tastbaar?

20. http://stad.gent/sparql
http://linkedgeodata.org/sparql
http://dbpedia.org/sparql
...

21. Examples
All places of Ghent
SELECT ?Thing
WHERE { ?Thing a <http://schema.org/Place> }
result

22. Examples
All places of Ghent
SELECT ?Thing
WHERE { ?Thing a <http://schema.org/Place> } LIMIT 100
Using LIMIT
result

23. Examples
All districts of Ghent
SELECT ?Thing
WHERE {
?Thing a <http://schema.org/Place> .
?Thing <http://stad.gent/data/internal/resourceType> "wijken" .
} LIMIT 100
result

24. Examples
All districts of Ghent
PREFIX schema: <http://schema.org/>
PREFIX gent: <http://stad.gent/data/internal/>
SELECT ?Thing
WHERE {
?Thing a schema:Place .
?Thing gent:resourceType "wijken" .
} LIMIT 100
Using PREFIX
result

25. Examples
All districts of Ghent
PREFIX schema: <http://schema.org/>
PREFIX gent: <http://stad.gent/data/internal/>
SELECT DISTINCT ?Thing
WHERE {
?Thing a schema:Place .
?Thing gent:resourceType "wijken" .
} LIMIT 100
Using DISTINCT
result

26. Examples
All districts of Ghent
PREFIX schema: <http://schema.org/>
PREFIX gent: <http://stad.gent/data/internal/>
SELECT count(distinct ?Thing) as ?aantal
WHERE {
?Thing a schema:Place .
?Thing gent:resourceType "wijken" .
}
Using COUNT
result

27. Examples
All districts of Ghent
PREFIX schema: <http://schema.org/>
PREFIX gent: <http://stad.gent/data/internal/>
SELECT DISTINCT ?name
WHERE {
?Thing a schema:Place .
?Thing gent:resourceType "wijken" .
?Thing schema:name ?name .
} LIMIT 100
By name
result

28. Examples
Products for ecological
companies:
PREFIX schema: <http://schema.org/>
PREFIX dct:<http://purl.org/dc/terms/>
SELECT ?product ?titel
WHERE {
?product a <http://purl.org/vocab/cpsv#PublicService>.
?product schema:audience <http://stad.gent/data/ns/gpdc/doelgroepen/onderneming>.
?product dct:subject <http://stad.gent/data/ns/themas/natuur-milieu>.
?product dct:title ?titel
}
result

29. SKOS
https://www.w3.org/2009/08/skos-reference/skos.html#
● skos:Collection
○ skos:OrderedCollection
● skos:Concept
● skos:ConceptScheme
○ skos:inScheme
○ skos:hasTopConcept
○ skos:topConceptOf
● skos:prefLabel
○ skos:altLabel
○ skos:note
○ skos:historyNote
● skos:semanticRelation
○ skos:mappingRelation
○ skos:closeMatch
○ skos:exactMatch
○ skos:broadMatch
○ skos:narrowMatch
○ skos:relatedMatch

30. SKOS: Example
Theme list
PREFIX skos:<http://www.w3.org/2004/02/skos/core#>
SELECT ?thema
WHERE {
?thema skos:inScheme <http://stad.gent/data/ns/themas/>
}
result

31. Examples
Recent news items related to
museums SMAK en Huis van Alijn
PREFIX schema:<http://schema.org/>
SELECT ?article ?titel ?published
WHERE {
VALUES ?org {
<https://stad.gent/id/agents/96677ab3-f689-e111-a140-0050569826fc>
<https://stad.gent/id/agents/ad7ccf21-61d8-e411-87b3-005056983224>
}.
?article a schema:NewsArticle.
?article schema:datePublished ?published.
?article <http://schema.org/sourceOrganization> ?org.
?article schema:headline ?titel
} ORDER BY DESC(?published) LIMIT 5
result