Criar um arquivo XML apartir de uma String

Programação Java
#1

Pessoal tenho a seguinte string:

String = "<bepdata xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:noNamespaceSchemaLocation=\"bepdata.xsd\" nlsDateFormat=\"DD-MM-YYYY HH24:MI:SS\" modelName=\"product\" modelVersion=\"1.10\" xmlns=\"\">"+
   "<bepX name=\"Service\" xmlns=\"\">"+
      "<attribX tagname=\"DES\" value=\"PDHTEST_5_Roaming\"/>"+
      "<attribX tagname=\"IMPORT_EXPORT_FLAG\" value=\"Y\"/>"+
      "<attribX tagname=\"PDE_IMPLICIT_IND\" value=\"Y\"/>"+
      "<attribX tagname=\"PRINT_BALANCE_IND\" value=\"Y\"/>"+
      "<attribX tagname=\"REC_VERSION\" value=\"Y\"/>"+
      "<attribX tagname=\"SHDES\" value=\"IMPLD\"/>"+
      "<attribX tagname=\"SNCODE\" value=\"1\"/>"+
      "<attribX tagname=\"SNIND\" value=\"Y\"/>"+
      "<attribX tagname=\"SNTYPE\" value=\"\" isNull=\"Y\"/>"+
   "</bepX>"+
   "<bepX name=\"ServiceNetworkType\" xmlns=\"\">"+
      "<attribX tagname=\"LCM_SERVICE_TYPE\" value=\"\" isNull=\"Y\"/>"+
      "<attribX tagname=\"REC_VERSION\" value=\"Y\"/>"+
      "<attribX tagname=\"SCCODE\" value=\"Y\"/>"+
      "<attribX tagname=\"SNCODE\" value=\"1\"/>"+
      "<attribX tagname=\"SNIND\" value=\"Y\"/>"+
      "<refX refname=\"Market\" bepname=\"Market\" keyType=\"public\">"+
         "<attribX tagname=\"SCSLPREFIX\" value=\"Y\"/>"+
      "</refX>"+
      "<refX refname=\"Service\" bepname=\"Service\" keyType=\"public\">"+
         "<attribX tagname=\"SHDES\" value=\"IMPLD\"/>"+
      "</refX>"+
      "</bepX>"+
"</bepdata>";

Como faria para transformar esta string em um arquivo XML?

#2
#3