RDF Gravity (RDF Graph Visualization Tool)

Sunil Goyal, Rupert Westenthaler
{sgoyal, rwestenthaler}@salzburgresearch.at
Salzburg Research, Austria

RDF Gravity is a tool for visualising RDF/OWL Graphs/ ontologies.
Its main features are:

RDF Gravity is implemented by using the JUNG Graph API and Jena semantic web toolkit.

Figure 1: Screenshot of RDF-Gravity, showing a part of Wine Ontology

Main Features

RDF Gravity defines a visualization package on top of the JUNG Graph API.
This package provides the following functionality:

Configurable renderers for edges and nodes of a graph, including different node shapes and edge decorations etc.
A Renderer Factory allowing the configuration of the above node and edge renderers based on the type of an edge or node.
Multi selection model for selection of nodes and edges of a graph.
Handling Mouse Events, for instance click, double click, drag, ... for nodes and edges of a graph.
Zooming

For graph layout, it uses the layout algorithms directly supported by the Jung API.

The tool allows a user to specify Global and Local filters to have specific views on the graph.

Global Filters allow a user to hide or view specific edges based on type. For instance, one can hide all edges of "rdf:bag", "dc:author" or a specific type occurring in any particular given ontology.
Local Filters allow a user to hide or view specific particular instances of nodes or edges.
A user can search for concepts and can add those in the graph for visualisation.

The above functionality allows having customizable graph views on a complex graph structure.

RDF Gravity provides a full text search over concepts, properties and instances specified in a RDF file.

RDF Gravity allows a user to view multiple graph structures contained in multiple RDF files through a single view.