Linked Data Knowledge Graphs with TriplyDB

Wouter Beek (

A question over multiple data sources

“Which empty office spaces are near hospitals?”

Steps to take:

  1. Copy the Key Registry of Addresses (empty office spaces)
  2. Copy the Key Registry of Topography (hospitals)
  3. Create geospatial index (proximity calculation + join)

Linked Open Data Cloud

LOD Cloud 2020-05-20 (

Open Standards

W3C standards for Linked Data Knowledge Graphs.

Siri/Alexa/Cortana use it

“Inside the Alexa-Friendly World of Wikidata” Wired 2019-02-18 (link)
Gartner Hype Cycle for Emerging Technologies 2019

FAIR data

Findable, Accessible, Interoperable, Re-usable (

TriplyDB: LD Browser

Visit online

TriplyDB: LD Insights

Visit online

Spatial & temporal

Visit online

Statistical information

Life expectancy for the countries of the world over time (dataset: Gapminder)

Spatial information

Visit online

Temporal information

Timeline of cars produced by Ford, Chevrolet, Porsche, and Toyota between 1903 and 2016 (dataset: DBpedia)

TriplyDB: Zero-cost data integration

Finding violations (1/2)

“In 2023 all Dutch office spaces with a surface of over 100m² must at least have energy label C.”
Source: Staatsblad 2012-11-02 (link)
ColorEnergy label
A, A+, A++, A+++

Finding violations (2/2)

Sources: Energy labels from The Netherlands Enterprise Agency (RVO), Dutch Land Measuring Agency (Kadaster).

Same question, now with Linked Data

“Which empty office spaces are near hospitals?”

Miljoenennota (Dutch Annual Budget)

Linked Data Innovation for a Smarter Government,
Amsterdam Data Science (ADS) blog post

Information products (Ministry of Finance)

Create complex ‘imformation products’ with little to no code.

Self-generating Applications

Sources: Dutch Bureau of Statistics (CBS) , National Archives (NA) .

Linked Closed Data

Open/closed data model: blue=open, red=closed

Search engines: generic

Public data in TriplyDB is automatically disclosed with

Search engines: specific

International Institute for Social History (IISH)

Humanitarian Aid

Cell tower coverage (mobile phone network)

Humanitarian Aid


Road network

Linked Data Knowledge Graphs with TriplyDB

Wouter Beek (