Script for getting XML tags in SQL

SELECT DBMS_XMLGEN.getxml(

'SELECT CURSOR(SELECT oha.order_number,

                     ola.ordered_item,

                     ola.ordered_quantity

                FROM ont.oe_order_headers_all oha,

                     ont.oe_order_lines_all ola

               WHERE oha.header_id = ola.header_id

                 and oha.order_number in (&order_number) order by ola.line_id) as order_detail,

       CURSOR(SELECT ohd.name, ohs.hold_comment

                FROM ont.oe_hold_sources_all ohs,

                     ont.oe_order_holds_all ohld,

                     ont.oe_hold_definitions ohd,

                     ont.oe_order_headers_all oha,

                     ont.oe_order_lines_all ola

               WHERE oha.header_id = ola.header_id

                 AND ola.line_id = ohld.line_id

                 and ohld.hold_release_id is null

                 AND ohld.hold_source_id = ohs.hold_source_id

                 AND ohs.hold_id =  ohd.hold_id

                 AND oha.order_number = &&order_number) as holds_detail

FROM DUAL')

FROM DUAL