Converting GHO to RDF

•

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This document describes converting the World Health Organization's Global Health Observatory data to RDF. It presents a semi-automated approach using OntoWiki's CSVImport plugin to transform CSV files into RDF according to the RDF Data Cube vocabulary. This allows the data to be queried and integrated more easily. As a demonstration, 50 health datasets were converted to RDF containing around 8 million triples and made available online. Future work could improve conversion accuracy and explore utilizing the temporal aspects of the data.

Converting WHO’s Global
Health Observatory Data to
RDF

Amrapali Zaveri, PhD student

August
27,
2012

1

Outline
• Background
• What is the RDF Data Cube Vocabulary?
• Semi-automated approach
• OntoWiki's CSVImport plug-in
• RDFized GHO data
• Limitations and Future Work

2

Background
• Biomedical statistical data
• Published as Excel sheets
• Advantage
• Readable by humans
• Disadvantages
• Cannot be queried efficiently
• Difficult to integrate with other data (in different formats)
• Our approach
• Converting data into a single data model - RDF
• Using the RDF Data Cube Vocabulary*
• designed particularly to represent multidimensional
statistical data using RDF.

*http://www.w3.org/TR/vocab-data-cube/

3

What is the RDF Data Cube
Vocabulary?

4

What is the RDF Data Cube
Vocabulary?

• Dimensions
• Attributes
• Measures
• Observations

5

Semi-automated approach
• Transforming CSV to RDF in a fully automated way is not
feasible.
• Dimensions may often be encoded in heading or
label of a sheet
• Our semi-automatic approach:
• As a plug-in in OntoWiki#
• a semantic collaboration platform developed by
the AKSW research group.
• A CSV file is converted into RDF using the RDF
Data Cube Vocabulary: http://aksw.org/Projects/
Stats2RDF

# Sören Auer, Sebastian Tramp (geb. Dietzold), Jens Lehmann, and Thomas Riechert:
OntoWiki: A Tool for Social Semantic Collaboration In: Proceedings of the Workshop on
Social and Collaborative Construction of Structured Knowledge CKC 2007 at the 16th
International World Wide Web Conference WWW2007 Banff, Canada, May 8, 2007 6

6. Re-use template for similar files

12

RDFized GHO data
gho:Country rdfs:subClassOf qb:DimensionProperty;
rdf:type rdfs:Class;
rdfs:label "Country" .

gho:Disease rdfs:subClassOf qb:DimensionProperty;
rdf:type rdfs:Class;
rdfs:label "Disease" .

gho: Afghanistan rdf:type ex:Country;
rdfs:label "Afghanistan" .

gho:Tuberculosis rdf:type ex:Disease;
rdfs:label "Tuberculosis" .

gho:c1-r6 rdf:type qb:Observation;
rdf:value "127"^^xsd:integer;
qb:dimension gho:Afghanistan;
qb:dimension gho:Tuberculosis .
14

RDFized GHO data

• Available at http://gho.aksw.org
• 50 datasets
• ~ 8 million triples
• Paper published at SWJ Call for Dataset descriptions:
http://www.semantic-web-journal.net/content/publishing-and-
interlinking-global-health-observatory-dataset

15

Limitations and Future Work
• Conversion

• Coherence

• Temporal Comparability

• Exploring GHO

16

Thank You!

Questions?

http://aksw.org/AmrapaliZaveri

zaveri@informatik.uni-leipzig.de

17

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Converting GHO to RDF

1. Converting WHO’s Global Health Observatory Data to RDF Amrapali Zaveri, PhD student August 27, 2012 1

2. Outline • Background • What is the RDF Data Cube Vocabulary? • Semi-automated approach • OntoWiki's CSVImport plug-in • RDFized GHO data • Limitations and Future Work 2

3. Background • Biomedical statistical data • Published as Excel sheets • Advantage • Readable by humans • Disadvantages • Cannot be queried efficiently • Difficult to integrate with other data (in different formats) • Our approach • Converting data into a single data model - RDF • Using the RDF Data Cube Vocabulary* • designed particularly to represent multidimensional statistical data using RDF. *http://www.w3.org/TR/vocab-data-cube/ 3

4. What is the RDF Data Cube Vocabulary? 4

5. What is the RDF Data Cube Vocabulary? • Dimensions • Attributes • Measures • Observations 5

6. Semi-automated approach • Transforming CSV to RDF in a fully automated way is not feasible. • Dimensions may often be encoded in heading or label of a sheet • Our semi-automatic approach: • As a plug-in in OntoWiki# • a semantic collaboration platform developed by the AKSW research group. • A CSV file is converted into RDF using the RDF Data Cube Vocabulary: http://aksw.org/Projects/ Stats2RDF # Sören Auer, Sebastian Tramp (geb. Dietzold), Jens Lehmann, and Thomas Riechert: OntoWiki: A Tool for Social Semantic Collaboration In: Proceedings of the Workshop on Social and Collaborative Construction of Structured Knowledge CKC 2007 at the 16th International World Wide Web Conference WWW2007 Banff, Canada, May 8, 2007 6

7. 1. Create Knowledge Base 7

8. 2. Import a CSV file 8

9. 3. Define dimensions 9

10. 4. Define data range 10

11. 5. Save template, extract triples 11

12. 6. Re-use template for similar files 12

13. 7. View resources 13

14. RDFized GHO data gho:Country rdfs:subClassOf qb:DimensionProperty; rdf:type rdfs:Class; rdfs:label "Country" . gho:Disease rdfs:subClassOf qb:DimensionProperty; rdf:type rdfs:Class; rdfs:label "Disease" . gho: Afghanistan rdf:type ex:Country; rdfs:label "Afghanistan" . gho:Tuberculosis rdf:type ex:Disease; rdfs:label "Tuberculosis" . gho:c1-r6 rdf:type qb:Observation; rdf:value "127"^^xsd:integer; qb:dimension gho:Afghanistan; qb:dimension gho:Tuberculosis . 14

15. RDFized GHO data • Available at http://gho.aksw.org • 50 datasets • ~ 8 million triples • Paper published at SWJ Call for Dataset descriptions: http://www.semantic-web-journal.net/content/publishing-and- interlinking-global-health-observatory-dataset 15

16. Limitations and Future Work • Conversion • Coherence • Temporal Comparability • Exploring GHO 16

17. Thank You! Questions? http://aksw.org/AmrapaliZaveri zaveri@informatik.uni-leipzig.de 17

Converting GHO to RDF

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