1. OEG’s Data Integration Group
RDB2RDF
Boris Villazón-Terrazas
Facultad de Informática, Universidad Politécnica de Madrid
Campus de Montegancedo sn, 28660 Boadilla del Monte, Madrid
http://www.oeg-upm.net
bvillazon@fi.upm.es
Phone: 34.91.3366605, Fax: 34.91.3524819
Slides available at: http://www.slideshare.net/boricles/
Acknowledgements: W3C RDB2RDF group members, Freddy
Priyatna, and Jean Paul Calbimonte.
WorkdistributedunderthelicenseCreativeCommonsAttribution-
Noncommercial-Share Alike 3.0

2. ToC
• Motivation
• Direct Mapping
• R2RML
• Morph / ODEMapster
2

3. A Survey of Current Approaches for Mapping of Relational Databases to RDF
A Survey of Current Approaches for Mapping of Relational Databases to RDF, Satya S. Sahoo, Wolfgang Halb, Sebastian Hellmann,
Kingsley Idehen, Ted Thibodeau Jr, Sören Auer, Juan Sequeda, Ahmed Ezzat, 2009. (See http://www.w3.org/2005/Incubator/rdb2rdf/
RDB2RDF_SurveyReport.pdf.)
3

4. RDB2RDF
• A majority of dynamic Web content is backed by relational databases (RDB),
and so are many enterprise systems.
transformation
transformation engine
description
• W3C RDB2RDF Working Group
• R2RML: RDB to RDF Mapping Language - http://www.w3.org/2001/sw/rdb2rdf/r2rml/
• Direct Mapping - http://www.w3.org/TR/rdb-direct-mapping/
• R2RML and Direct Mapping Test Cases - http://www.w3.org/2001/sw/rdb2rdf/test-cases/
• RDB2RDF Implementation Report - http://www.w3.org/2001/sw/rdb2rdf/implementation-
report/
4

5. Access the RDF data in different ways
• The consumer of the RDF Graph (virtual or
materialized)
Use Cases and Requirements for Mapping Relational Databases to RDF
http://www.w3.org/2001/sw/rdb2rdf/use-cases/
5

6. Direct Mapping
• The direct mapping defines an RDF Graph
representation of the data in an RDB. The direct
mapping takes as input an RDB (data and schema),
and generates an RDF graph that is called the direct
graph.
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7. Direct Mapping - example
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8. R2RML
• A language for expressing customized mappings
from RDB to RDF datasets.
• R2RML mappings are themselves expressed as RDF
graphs and written down in Turtle syntax.
8

9. R2RML - Overview
9

10. R2RML - Overview
10

11. R2RML - example I - input
11

12. R2RML - example I - mapping
12

13. R2RML – example I - output
13

14. R2RML – example II - input
14

15. R2RML - example II - mapping
15

16. R2RML – example II - output
16

17. R2RML - example III - input
17

18. R2RML - example III - mapping
18

19. 19

20. R2RML - example III - output
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21. R2RML - example IV - input
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22. R2RML - example IV - mapping
22

23. 23

24. R2RML - example IV - output
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25. Morph / ODEMapster - database
25

26. mapping
26

27. 27

28. Upload to an RDF store - Fuseki
28

29. 29

30. • http://code.google.com/p/oeg-obdi/
• https://github.com/jpcik/morph
• https://github.com/boricles/morph
•
RDB2RDF Implementation Report. Boris Villazón-Terrazas, Michael Hausenblas.
http://www.w3.org/2001/sw/rdb2rdf/implementation-report/
30

32. OEG’s Data Integration Group
RDB2RDF
Boris Villazón-Terrazas
Facultad de Informática, Universidad Politécnica de Madrid
Campus de Montegancedo sn, 28660 Boadilla del Monte, Madrid
http://www.oeg-upm.net
bvillazon@fi.upm.es
Phone: 34.91.3366605, Fax: 34.91.3524819
Slides available at: http://www.slideshare.net/boricles/
Acknowledgements: W3C RDB2RDF group members, Freddy
Priyatna, and Jean Paul Calbimonte.
WorkdistributedunderthelicenseCreativeCommonsAttribution-
Noncommercial-Share Alike 3.0