predicatePrefix = model.getNsURIPrefix(predicateNs);
// atom argument1
nodeIterator = model.listObjectsOfProperty(atom_resource, argument1_property);
if (nodeIterator.hasNext() && (node = nodeIterator.next()).isResource()) {
argument1Id = node.asResource().getLocalName();
logger.debug("The atom argument1 is: " + argument1Id);
if (isInstanceOfTheClass(node.asResource(), attribute))
argument1Type = ArgumentType.ATTRIBUTE;
else if (isInstanceOfTheClass(node.asResource(), variable))