DOM, apply xsl on document object

I am creating a document object, example

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            DocumentBuilder parser = factory.newDocumentBuilder();
            document = parser.newDocument();
            Element eleroot = document.getDocumentElement();
            eleObj = document.createElement("department");
            eleroot.appendChild(eleObj);
            createElementNode(document, eleObj, "department", l_dept_name);
            eleObj = document.createElement("from_date");
            eleroot.appendChild(eleObj);
            createElementNode(document, eleObj, "start_date", startDate);
            eleObj = document.createElement("to_date");
            eleroot.appendChild(eleObj);
            createElementNode(document, eleObj, "end_date", endDt);
            String queryText2 = "select process_name,datetostring(a.r_creation_date,'month yy') AS r_month,sum(carried_forward_app) AS carried_forward_app, sum(num_of_app_received) AS num_of_app_received,   sum(forecast) AS forecast, sum(num_of_app_rejected) AS num_of_app_rejected, sum(pending) AS pending , max(longest_current_pending) AS longest_current_pending , sum(actioned_within_sla) AS actioned_within_sla, sum(actioned_outof_sla) AS actioned_outof_sla,  sum(referrals) AS referrals, sum(num_of_errors) AS num_of_errors, sum(num_of_backlog_app) AS num_of_backlog_app, min(age_oldest) AS age_oldest , sum(sla_adherence) AS sla_adherence  , sum(conformance_rate) AS  conformance_rate , sum(referral_rate) AS  referral_rate   from ctb_daily_report_summary a where  datetostring(a.r_creation_date,'yyyy/mm/dd') >= '" + p_st_date + "'" + " and datetostring(a.r_creation_date,'yyyy/mm/dd') <= '" + p_en_date + "'" + " and a.process_name in (select distinct title from ctb_folder where folder('/Global_Hub/On_Demand_Request'))" + " group by  process_name , datetostring(r_creation_date,'month yy') order by 1";
            IDfCollection collProcess = null;
            collProcess = execQuery(queryText2, session);
            int seq = 0;
            int l_referral_rate;
            for(; collProcess.next(); createElementNode(document, eleObj, "referral_rate_total", ""+l_referral_rate))
            {
                eleObj = document.createElement("process-total");
                eleroot.appendChild(eleObj);
                seq++;
                String l_proce_name = collProcess.getString("process_name");
                l_month = collProcess.getString("r_month");
                int l_carried_tot = collProcess.getInt("carried_forward_app");
                int l_num_of_app_received = collProcess.getInt("num_of_app_received");
                int l_forecast = collProcess.getInt("forecast");
                int l_pending = collProcess.getInt("pending");
                int l_actioned_within_sla = collProcess.getInt("actioned_within_sla");
                System.out.println("l_actioned_within_sla"+l_actioned_within_sla);
                int l_actioned_outof_sla = collProcess.getInt("actioned_outof_sla");
                int l_num_of_app_rejected = collProcess.getInt("num_of_app_rejected");
                int l_referrals = collProcess.getInt("referrals");
                int l_num_of_errors = collProcess.getInt("num_of_errors");
                int l_num_of_backlog_app = collProcess.getInt("num_of_backlog_app");            
                createElementNode(document, eleObj, "referrals_total", ""+l_referrals);
            }

After the document object is created, i want ot apply an XSL on it and get the results

PLease tell me how to go about it. THe getXMLString() does not exist in DOM so gives an error. Please help