1. DBpedia (in) ALIGNED
From DBpedia to DBpedia+
Dimitris Kontokostas
AKSW Group, Leipzig University
DBpedia Association

2. February 9th 2015 / 3rd DBpedia Meeting in Dublin
DBpedia @ 2007

3. February 9th 2015 / 3rd DBpedia Meeting in Dublin
DBpedia @ 2008

4. February 9th 2015 / 3rd DBpedia Meeting in Dublin
DBpedia @ 2009

5. February 9th 2015 / 3rd DBpedia Meeting in Dublin
DBpedia @ 2010

6. February 9th 2015 / 3rd DBpedia Meeting in Dublin
DBpedia @ 2011

7. February 9th 2015 / 3rd DBpedia Meeting in Dublin
DBpedia @ 2014

8. February 9th 2015 / 3rd DBpedia Meeting in Dublin
RDF Stats (2014 release)
3B facts (only 580M facts in English)
● DBpedia En: 4.58M Things / 4.22M typed
● 125 Localized versions: 38.3M Things
● 50M links to other datasets
Many more stats @:
dbpedia.org/Datasets2014/DatasetStatistics

9. February 9th 2015 / 3rd DBpedia Meeting in Dublin
Dev Stats
DBpedia Information Extraction Framework
● Java/Scala based framework
○ Old PHP-based framework
● 5.1K Commits
● 52K lines of code (100K/1M AT)
● 71 total contributors
Many more stats @:
www.openhub.net/p/dbpedia

10. February 9th 2015 / 3rd DBpedia Meeting in Dublin
Aligning Problem
Lot’s of code & a lot more data
● Wikipedia evolves over time
○ Infobox Templates change, merge, deleted
○ New formatting templates
○ Structural differences per language edition
● Code should adapt to all the changes
○ hard at this (data) scale

11. February 9th 2015 / 3rd DBpedia Meeting in Dublin
Unit-testing to the rescue?
● Software & Data testing
● Straightforward for software (since 70’s)
● Preliminary for (RDF) data
○ RDFUnit, SPIN, OWL, PelletICV, ShEx,...
■ W3C Data Shapes WG
Data testing++
● Generation: manual, (Semi)automatic, ...
● Linking: data & software tests

12. February 9th 2015 / 3rd DBpedia Meeting in Dublin
RDFUnit
http://rdfunit.aksw.org

13. February 9th 2015 / 3rd DBpedia Meeting in Dublin
UT feedback loop
Data verification and feedback at different
data extraction stages
● Three main points of failure in DBpedia:
○ Code
○ Infobox mappings
○ Wikipedia (!!!)

14. February 9th 2015 / 3rd DBpedia Meeting in Dublin
DBpedia+
Workflow

15. February 9th 2015 / 3rd DBpedia Meeting in Dublin
Additional feedback
We are looking into:
● Reporting
● Statistics
● Inter-Wikipedia cross-checking
● ML techniques

16. February 9th 2015 / 3rd DBpedia Meeting in Dublin
Thank you & Questions?
ALIGNED
Aligned, Quality-centric Software and Data
Engineering