Twinkle is a GUI tool for writing and running SPARQL queries against local files, remote files, Jena databases, and SPARQL endpoints. It allows inferencing using RDFS, OWL, and Jena rules. Configuration is done declaratively using the Jena assembler API. Twinkle utilizes the ARQ SPARQL query engine and provides additional functions and property libraries. Future plans include improved documentation, access control, caching, and syntax highlighting.

1. Twinkle: A SPARQL Query Tool Leigh Dodds, Oxford SWIG, March 2008 Photo Credit: Glen Bowman

2. What Is It? A GUI for writing and running SPARQL queries

4. Data Sources Local Files Remote Files Jena Databases Any combination of these

5. SPARQL Endpoints Complete SPARQL Client Useful pre-configured sources, e.g. DBPedia

6. But Wait, There’s More RDFS and OWL Inferencing Jena Rules Engine And any combination

8. Demonstration (Where It All Goes Wrong)

9. The Secret Sauce ARQ SPARQL query engine The Jena Assembler API

10. Jena Assembler API Declaratively describe how to build a Jena Model URIs, Databases Add default content Apply schemas, reasoning

11. :periodicTable a ja:MemoryModel ; ja:content [ ja:externalContent <http://www.daml.org/2003/01/periodictable/PeriodicTable.owl> ] ; rdfs:label &quot;Periodic Table&quot; . Config Example

12. :nlm ja:modelName &quot;nlm-data&quot; ; ja:connection :nlm-connection ; rdfs:label &quot;NLM Data&quot; . :nlm-connection ja:dbURL <jdbc:mysql://127.0.0.1:3306/facet> ; ja:dbClass &quot;com.mysql.jdbc.Driver&quot; ; ja:dbType &quot;MySQL&quot; ; ja:dbUser &quot;facet&quot; ; ja:dbPassword “*********&quot; Config Example (2)

13. <http://dbpedia.org/sparql> a sources:Endpoint ; sources:defaultGraph &quot;http://dbpedia.org&quot; ; rdfs:label &quot;DBpedia.org&quot;. <http://www.rdfabout.com/sparql> a sources:Endpoint ; rdfs:label &quot;GovTrack.us&quot;. Config Example (3)

14. Where It All Goes etc\config.n3 Describe (and label) models Prefix Mappings

15. Prefix Mappings Quickly add PREFIX statement to query Pre configured vocabularies Add your own…

16. Prefix Mappings :foaf a ja:PrefixMapping ; rdfs:label &quot;FOAF&quot; ; ja:prefix &quot;foaf&quot; ; ja:namespace &quot;http://xmlns.com/foaf/0.1/&quot; .

17. Demonstration (2)

18. … And Yet More ARQ Function & Property Library ARQ Extensions (e.g. COUNT, GROUP BY)

19. Future Plans Documentation! SPARQL Endpoint Access Control Model Caching Syntax Highlighting More Eye Candy Move to Google Code (Your Feature Here)

20. Questions? Twinkle Homepage Annotated Screenshots http://www.slideshare.net/ldodds/twinkle-a-sparql-query-tool/