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

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

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

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

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

Demonstration (Where It All Goes Wrong)

The Secret Sauce ARQ SPARQL query engine The Jena Assembler API

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

: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

:periodicTable a ja:MemoryModel

; ja:content [

ja:externalContent

<http://www.daml.org/2003/01/periodictable/PeriodicTable.owl>

]

; rdfs:label &quot;Periodic Table&quot;

.

: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)

: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;

<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)

<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;.

Where It All Goes etcconfig.n3 Describe (and label) models Prefix Mappings

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

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; .

Demonstration (2)

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

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

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