Parsing XML input

Question

I will be getting an XML string as input to a program which will parse the XML and execute a given procedure. The XML string will contain the name of a package, the program within the package, the parameter names, and parameter values.
Right now, I'm assuming the input will be in this format:
<?xml version="1.0"?> 
                        <oracle_pkg> 
                          <pkg id="EMP_TEST_PKG"> 
                            <prc id="P_GET_EMP">
                                <param_name id="p_EmpID">
                                  <param_val>12345</param_val>                                 
                                </param_name>
                                <param_name id="p_EmployeeType">
                                  <param_val>F</param_val>                                 
                                </param_name>
                           </prc> 
                          </pkg>
                        </oracle_pkg>Now how would I be able to query this string to get the following as results?
pkg             prc             param_name      param_val
EMP_TEST_PKG     P_GET_EMP     p_EmpID         12345
EMP_TEST_PKG     P_GET_EMP     p_EmployeeType  FI understand that my XML string format may not be in the right structure to create the output that I want, so please make suggestions as necessary.
Thanks!

Answer 1

Well it appears I need to do something more like this:
DECLARE
v_xml_string  LONG := '<?xml version="1.0"?> 
                        <oracle_pkg> 
                          <pkg id="EMP_TEST_PKG"> 
                            <prc id="GET_EMP">
                                <param_name id="p_EmpID">
                                  <param_val>12345</param_val>                                 
                                </param_name>
                                <param_name id="p_EmployeeType">
                                  <param_val>F</param_val>                                 
                                </param_name>
                            </prc> 
                          </pkg>
                        </oracle_pkg>';
BEGIN
  FOR rec IN (SELECT t.COLUMN_VALUE.extract('/pkg/@id') .getStringVal() pkg_name,
                     t.COLUMN_VALUE.extract('/pkg/prc/@id') .getStringVal() proc_name,
                     t.COLUMN_VALUE.extract('/pkg/prc/param_name/@id') .getStringVal() parameter_id,
                     t.COLUMN_VALUE.extract('/pkg/prc/param_name/param_val
              FROM   TABLE(xmlsequence(XMLTYPE(v_xml_string)
                                       .extract('/oracle_pkg/pkg'))) t)  
  LOOP
   dbms_output.put_line('Pkg Name=' || rec.pkg_name);
   dbms_output.put_line('Proc Name=' || rec.proc_name);
   dbms_output.put_line('Param Name=' || rec.parameter_id);
   dbms_output.put_line('Param Val=' || rec.parameter_val);
  END LOOP;
END;                                          The result of this is:
Pkg Name=PK_SLEA_FA
Proc Name=PR_FA_GetEmployeeInfo
Param Name=p_EmpIDp_EmployeeType
Param Val=12345F...but I would rather have it as:
Pkg Name=PK_SLEA_FA
Proc Name=PR_FA_GetEmployeeInfo
Param Name=p_EmpID
Param Val=12345
Pkg Name=PK_SLEA_FA
Proc Name=PR_FA_GetEmployeeInfo
Param Name=p_EmployeeType
Param Val=FAny ideas?