* @param properties A list of properties to index.
*/
public void addDefinitionVirtual(UriRef rdfType, List<VirtualProperty> properties) {
deleteDefinition(rdfType);
GraphNode node = new GraphNode(new BNode(), definitionGraph);
node.addProperty(RDF.type, CRIS.IndexDefinition);
node.addProperty(CRIS.indexedType, rdfType);
for (VirtualProperty p : properties) {
node.addProperty(CRIS.indexedProperty, asResource(p));
}