rdb2rdf, an overview of r2rml and direct mapping

OEG’s Data Integration Group RDB2RDF

WorkdistributedunderthelicenseCreativeCommonsAttribution-Noncommercial-Share Alike 3.0

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.

ToC

•  Motivation •  Direct Mapping •  R2RML •  Morph / ODEMapster

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A Survey of Current Approaches for Mapping of Relational Databases to RDF

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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.)

•  A majority of dynamic Web content is backed by relational databases (RDB), and so are many enterprise systems.

•  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/

RDB2RDF

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transformation description

transformation engine

Access the RDF data in different ways

•  The consumer of the RDF Graph (virtual or materialized)

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Use Cases and Requirements for Mapping Relational Databases to RDF http://www.w3.org/2001/sw/rdb2rdf/use-cases/

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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Direct Mapping - example

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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.

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R2RML - Overview

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R2RML - Overview

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R2RML - example I - input

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R2RML - example I - mapping

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R2RML – example I - output

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R2RML – example II - input

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R2RML - example II - mapping

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R2RML – example II - output

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R2RML - example III - input

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R2RML - example III - mapping

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R2RML - example III - output

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R2RML - example IV - input

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R2RML - example IV - mapping

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R2RML - example IV - output

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Morph / ODEMapster - database

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mapping

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Upload to an RDF store - Fuseki

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•  http://code.google.com/p/oeg-obdi/

•  https://github.com/jpcik/morph

•  https://github.com/boricles/morph

• 

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RDB2RDF Implementation Report. Boris Villazón-Terrazas, Michael Hausenblas. http://www.w3.org/2001/sw/rdb2rdf/implementation-report/

OEG’s Data Integration Group RDB2RDF

WorkdistributedunderthelicenseCreativeCommonsAttribution-Noncommercial-Share Alike 3.0

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.