Simple example of using the persistent db layer with ontology models. Assumes
that a PostgreSQL database called 'jenatest' has been set up, for a user named ijd.
author: Ian Dickinson, HP Labs author: (email) version: CVS $Id: PersistentOntology.java,v 1.1 2005/10/06 17:49:07 andy_seaborne Exp $