You could use the CALL TRANSFORMATION command to deserialize the XML document :
CALL TRANSFORMATION ID
SOURCE XML asx_doc
RESULT BN_1 = v_1 ? BN_n = v_n.
(Refer to the ABAP help for details).
There is an excellent article about ABAP-XML transformation in the SAP Profession Journal from Nov/Dec 2002: ?Mastering the asXML Format to Leverage ABAP-XML Serialization?. (http://www.sappro.com – http://www.pinetec.com/customers/ucg/sappro/data/pdfs/vol-4-6/p029.pdf).
More information on XML can also be found on SAP Developer Network: www.sdn.sap.com .