# rhizomik/redefer-rdf2svg

Renders input RDF as a SVG showing configurable views of its structures (as a full graph, classes or properties hierarchy, ontology,...)
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pom.xml

# Introduction

The RDF to SVG service RDF2SVG generates a SVG graphical representation of the input RDF following the workflow:

RDF -rules-> Graph Visualization RDF Model -xslt-> .DOT File -Graphviz-> SVG


The input RDF goes through a set of Jena rules that select the parts of the RDF structure to show and models them also using RDF. Currently there are 4 set of rules that:

• Represent the whole graph structure generated by RDF triples.
• Represent just the hierarchical structure of the classes defined in the input RDF.
• Represent the hierarchy of parts in the input RDF.
• (Beta) Represent the OWL constructs in the input RDF defining an ontology.

As a result of the reasoning based on the selected set of rules, an output RDF modelling the graph structure to visualize is generated. This RDF is then processed by an XSL transformation that models the same structure using the Graphviz .DOT format.

The .DOT file is then sent to Graphviz, which layouts the graph visualization and renders it as an SVG, the final output of the RDF to SVG web service.

# Installation

To build the deployment WAR file using the source code and Maven:

mvn clean package


A prebuilt WAR file is available from: http://rhizomik.net/html/redefer/rdf2svg.war

RDF2SVG requires that Graphviz is installed in the machine it is deployed in. Graphviz can be downloaded from http://www.graphviz.org. Once installed, configure RDF2SVG so it can find it. In the rdf2svg/WEB-INF/web.xml file, once the WAR file is decompressed, edit the dotPath parameter to point to the appropriate executable (for instance /usr/local/bin/dot or C:\Programs\GraphViz\bin\dot.exe).

# Use

When deployed in a local servlet container like Tomcat, the RDF2SVG service will be available at something like: http://localhost:8080/rdf2svg/render

(The service is deployed at rhizomik.net/redefer-services/render and it can be tested from http://rhizomik.net/redefer/rdf2svg-form/)

It can called using GET or POST. The former is recommended when the RDF to be transformed is available from a URL, the latter when direct input is provided.

The parameters of the service are:

Examples using GET and the RDF2SVG service deployed at rhizomik.net/redefer-services/render: