// Graph
Graph graph = workflow.getGraph();
if (graphResource == null) {
logger.finest("Creating a new graphResource");
graphResource = new GcXmlWebResource("process.xgr", graph.toXML(),
GRAPH_MIME_TYPE);
graphResource.setRel(GPELLinksFilter.REL_XWF);
links.add(graphResource);
} else {
logger.finest("Updating the graphResource");