Fix XMLType parameter handling on Oracle 12c+

Oracle 12c+ reports XMLType parameters with data_type "XMLTYPE"
instead of "UNDEFINED". Handle both values in add_argument and
add_return_variable so the XMLTYPE wrapper SQL is generated correctly.

This fixes the XMLType tests that were skipped since issue #114.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: yahonda

lib/plsql/procedure_call.rb

@@ -240,8 +240,8 @@ def add_argument(argument, value, argument_metadata = nil)
           @bind_values[argument] = value.nil? ? nil : (value ? 1 : 0)
           @bind_metadata[argument] = argument_metadata.merge(data_type: "NUMBER", data_precision: 1)
           "l_#{argument}"
-        when "UNDEFINED"
-          if argument_metadata[:type_name] == "XMLTYPE"
+        when "UNDEFINED", "XMLTYPE"
+          if argument_metadata[:type_name] == "XMLTYPE" || argument_metadata[:data_type] == "XMLTYPE"
             @declare_sql << "l_#{argument} XMLTYPE;\n"
             @assignment_sql << "l_#{argument} := XMLTYPE(:#{argument});\n" if not value.nil?
             @bind_values[argument] = value if not value.nil?
@@ -395,8 +395,8 @@ def add_return_variable(argument, argument_metadata, is_return_value = false)
             end
           end
           "l_#{argument} := " if is_return_value
-        when "UNDEFINED"
-          if argument_metadata[:type_name] == "XMLTYPE"
+        when "UNDEFINED", "XMLTYPE"
+          if argument_metadata[:type_name] == "XMLTYPE" || argument_metadata[:data_type] == "XMLTYPE"
             @declare_sql << "l_#{argument} XMLTYPE;\n" if is_return_value
             bind_variable = :"o_#{argument}"
             @return_vars << bind_variable

spec/plsql/procedure_spec.rb

@@ -258,8 +258,8 @@
     end
 
     after(:all) do
-      plsql.execute "DROP FUNCTION test_xmltype"
-      plsql.execute "DROP PROCEDURE test_xmltype2"
+      plsql.execute "DROP FUNCTION test_xmltype" rescue nil
+      plsql.execute "DROP PROCEDURE test_xmltype2" rescue nil
       plsql.logoff
     end