1. RDF Generation and Linking using Open Refine Daniel Vila-Suero dvila@fi.upm.es

2. Introduction Learn how to use Open Refine and its RDF extension Map tabular data to RDF Link entities to a external dataset

3. Overview 3

4. Installation Download Open Refine at: http://openrefine.org/download.html Download the RDF Extension at: http://refine.deri.ie/

5. Installing the RDF Extension Make sure "extensions" folder exists in your Google Refine workspace Download the extension Extract the downloaded zip file to the "extensions" folder Start/Restart Google Refine

6. Data Download available at: http://data.freeyourmetadata.org/powerhouse- museum/phm-collection-cleaned.zip

7. Task 1 Inspect the data Pre-process if neccesary

8. Task 2 Using the RDF extension map the data to RDF using a selection of vocabularies

9. Task 3 Using a reconciliation service try to find entities within your data that have URIs in other dataset. For example the LCSH (Library of Congress Subject Heading) with the following configuration: Name: LCSH (preprocessed) Endpoint URL: http://sparql.freeyourmetadata.org/ Graph URI: http://sparql.freeyourmetadata.org/authorities- processed/ Type: Virtuoso Label properties: check only skos:prefLabel

10. Publish Load the data in a SPARQL endpoint (Virtuoso, 4store, Fuseki, Sesame, etc.) Install and configure a LD front-end: Recommended: Puelia (PHP), Elda (Java) Configurable using a config file in turtle Documentation available at: https://code.google.com/p/linked-data- api/wiki/Specification 10