Learn the difference between data and information and get Linked Data to work by adding a sixth star – using APIs – to Sir Tim Berners-Lee’s 5-Star model for publishing information on the Semantic Web. This session includes an introduction to Linked Open Data, Linked Closed Data, JSON-LD and the 5-Star model and provides a step-by-step walk-through of a successful technical implementation with your API.
22. Bank
Account Name CoC Contact Address PC City Balance
54.31.23.650 Apiwise 62956787 D. van Hees Kronenburgersingel 49 6511AL Nijmegen € 100
Cadastre (Land Register)
Number Street Number Postcode Place Value Surface Function
12345 Kronenburgersingel 49 6511AL Nijmegen € 100.000 65m² Living
Chamber of Commerce
Number Official name Type Founded Address
62956787 Apiwise V.O.F. V.O.F. 2015/04/01 Kronenburgersingel 49, 6511AL, Nijmegen
Linking datasets
23. Bank
Account Name CoC Contact Address PC City Balance
54.31.23.650 Apiwise 62956787 D. van Hees Kronenburgersingel 49 6511AL Nijmegen € 100
Chamber of Commerce
Number Official name Type Founded Address
62956787 Apiwise V.O.F. V.O.F. 2015/04/01 Kronenburgersingel 49, 6511AL, Nijmegen
Linking datasets
Cadastre (Land Register)
Number Street Number Postcode Place Value Surface Function
12345 Kronenburgersingel 49 6511AL Nijmegen € 100.000 65m² Living
24. Bank
Account CoC Contact Balance
54.31.23.650 62956787 D. van Hees € 100
Chamber of Commerce
Number Official name Type Founded Cadastre
62956787 Apiwise V.O.F. V.O.F. 2015/04/01 12345
Linking datasets
Cadastre (Land Register)
Number Street Number Postcode Place Value Surface Function
12345 Kronenburgersingel 49 6511AL Nijmegen € 100.000 65m² Living
25. Bank
Contact CoC LinkedIn Facebook
D. van Hees 62956787 dimitrivanhees dvanhees
CoC
Number Cadastre
62956787 12345
20106830 67890
Cadastre
Street Place
Kronenburgersingel Nijmegen
Wilhelminapark Tilburg
Facebook
Residence Places Sports
Nijmegen Tilburg Football
LinkedIn
Company Birthplace School
Apiwise,
Freshheads
Nijmegen Tilburg University
26. Bank
Contact CoC LinkedIn Facebook
D. van Hees 62956787 dimitrivanhees dvanhees
CoC
Number Cadastre
62956787 12345
20106830 67890
Cadastre
Street Place
Kronenburgersingel Nijmegen
Wilhelminapark Tilburg
Facebook
Residence Places Sports
Nijmegen Tilburg Football
LinkedIn
Company Birthplace School
Apiwise,
Freshheads
Nijmegen Tilburg University
Open Data
Location Province Avg. income Inhabitants
Nijmegen Gelderland € 12.600 168.840
Tilburg Noord-Brabant € 13.900 191.275
Open Data
Location Founded Rector
Tilburg 1927 P. Eijlander
Open Data
Category Type
Ball sport Team
27. Query for people who:
• Live in a city with more than 170.000
inhabitants
• Like team sports and went to a school that
was founded before 1930
• Are connected to a V.O.F. company from
Gelderland with a negative balance
• Like ball games and own an office larger than
150m² in a place where the average value is
less than € 200.000
28. “Linked Data makes it possible to get
new insights in data which were
technically impossible in the past. It’s
up to marketing people to come up
with challenging queries.”
34. ★ ★ ★ ★
“Use URIs to denote things, so
that people can point at your
stuff (RDF)”
35. ★ ★ ★ ★ ★
“Link your data to other data to
provide context (Linked Data)”
36. Data landscape
• Data consumers
• Data publishers
• Open Data community
• API community
• Linked Data community
37. Data consumers
• Provide us the developer-friendliest way to access your
data and we MIGHT use it
38. Data publishers
• HOW should we publish our data?
• What are the COSTS of doing it that way?
• What are the BENEFITS of doing it that way?
39. Open Data community
• We don’t care HOW the data is published
• We only care IF the data is open
40. API community
• Every publisher SHOULD provide RESTful JSON APIs
• Because every consumer KNOWS RESTful JSON APIs
• We DON’T believe in Linked Data
41. Linked Data community
• Every publisher SHOULD provide five star data
• Every consumer SHOULD learn SPARQL*
• So we DON’T need APIs
*Linked Data query language
47. Benefits
According to EU studies the amount of apps being
developed with Linked Open Government Data is
negligible.
https://joinup.ec.europa.eu/sites/default/files/85/31
/25/Study_on_business_models_for_Linked_Open_
Government_Data_BM4LOGD_v1.00.pdf
48. Costs
• Knowledge investment (unknown technology)
• Technical investment (hosting infrastructure)
• Time investment (change management)
• Low ROI
52. ★ ★ ★ ★
“Provide online access via
webservices so developers can
use your stuff the way they are
used to (RESTful JSON API)”
53. ★ ★ ★ ★ ★
“Add context to your API so it can be
linked to other datasets, developers
know what the data means and LD
guys can convert it to triples, store it
in triplestores and use SPARQL if they
want to (JSON-LD)”
70. Data Information
Property Value
id AB-01-CD
type ?
brand AUDI
kleur ROOD
A?2JKs=- 1932
application/json
Property Value
id rdw.nl/AB-01-CD
rdf:type schema.org/Car
schema.org/brand dbpedia.org/Audi
schema.org/color dbpedia.org/Red
dbpedia.org/foundingYear 1932
application/ld+json
74. Separation of concerns
• It’s all about conversion
• A website is just another representation of
information
• People WILL skip the restaurant’s website if they’re
hungry and can get food by just yelling HUNGRY at
their mobile phone
• Publish information instead of data!
75. “The Semantic Web does exist and goes hand
in hand with APIs. Using six stars instead of
five, APIs are part of the deployment scheme
while making live easier for both data
publishers and consumers. Let’s bridge the
gap, bring the best of both worlds, and let’s
change the web together by publishing
information instead of data.”