public void print_extraction_method_XML(Hashtable<String, LinkedList<Triple<String,String,String>>> relations) throws IOException {
		w.write("<?xml version=\"1.0\"?>\n<rdf:RDF\nxmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\">\n");
		LinkedList<Tuple<String, LinkedList<Triple<String,String,String>>>> relations_sorted = relation_sort(relations);
		for(int j = 0; j < relations_sorted.size(); j++){
			String rel = relations_sorted.get(j).get_x().replace("relation: ", "").replace("<S>", "S").replace("<O>", "O").replace(" ", "_");
			LinkedList<Triple<String,String,String>> list = relations_sorted.get(j).get_y();
			for(int index = 0; index < list.size(); index++){
				String subj = list.get(index).get_x().replace("sujet:  ", "");
				w.write("<rdf:Description rdf:about=\""+subj+"\">\n");
				String obj = list.get(index).get_y().replace("objet:  ", "");
				w.write("   <"+rel+" rdf:resource=\""+obj+"\" />\n");
				w.write("</rdf:Description>\n");
			}
		}
		w.write("</rdf:RDF>");
	}