Semantika Sesame

This project aims to setup a Semantika SPARQL endpoint through Sesame Workbench. The endpoint uses the underlying database system to answer SPARQL queries from users.

Latest release: 1.2 (build 17) is available! (July 8, 2014)

Easy Installation

• Download and install Tomcat 7.x into your local machine.
• Download the latest release of Semantika Sesame project bundle. The zip contains two WAR files, i.e., openrdf-sesame.war and openrdf-workbench.war
• Deploy the WAR packages to $CATALINA_HOME/webapps/ where $CATALINA_HOME represents the location directory of your Tomcat installation. In UNIX, the usual location is "/usr/share/tomcat7".
• Run Tomcat. The web container will unpack the WAR packages and run the servlets.
• Go to address "http://localhost:8080/openrdf-workbench" using a web browser.

To test the installation: In the workbench page, create "New repository" using the left menu. A "New Repository" page appears with "Type: Semantika Virtual RDF Store" shows in the drop-down menu.

Creating an Endpoint

Below is an example for creating an endpoint for our Semantika-MusicBrainz project.

• To create an endpoint, you will need a configuration file that provides the application resources.

<semantika-configuration>
   <application-factory name="musicbrainz-endpoint">
      <data-source>
         <property name="connection.url">jdbc:h2:tcp://localhost/mbzdb</property>
         <property name="connection.driver_class">org.h2.Driver</property>
         <property name="connection.username">sa</property>
         <property name="connection.password"></property>
      </data-source>
      <mapping-source resource="file:///home/user/musicbrainz/res/artist.tml.xml" strict-parsing="false"/>
   </application-factory>
</semantika-configuration>

Notice that the URL protocol file:// is used to locate the mapping resource at /home/user/musicbrainz/res/artist.tml.xml

• Complete the "New Repository" form by filling the ID, title and configuration file location.

• Once the endpoint was succesfully created, make a query using the "Query" menu item. The example asks for all artists that performed as a solo artist and each name.

• Check the returned results.

Need Help?

Check our Wikipage for a brief introduction. Need more help? Join OBDA Semantika Forum.