***************
*** 21,33 ****
            options[:builder].instruct! unless options.delete(:skip_instruct)
  
            options[:builder].__send__(options[:root]) do
-             for key in keys
-               value = self[key]
  
-               case value.class.to_s # TODO: Figure out why I have to to_s the class to do comparisons in order for tests to run
-                 when "Hash"
                    value.to_xml(options.merge({ :root => key, :skip_instruct => true }))
-                 when "Array"
                    value.to_xml(options.merge({ :root => key, :children => key.to_s.singularize, :skip_instruct => true}))
                  else
                    type_name = XML_TYPE_NAMES[value.class.to_s]
--- 21,32 ----
            options[:builder].instruct! unless options.delete(:skip_instruct)
  
            options[:builder].__send__(options[:root]) do
+             each do |key, value|
  
+               case value
+                 when ::Hash
                    value.to_xml(options.merge({ :root => key, :skip_instruct => true }))
+                 when ::Array
                    value.to_xml(options.merge({ :root => key, :children => key.to_s.singularize, :skip_instruct => true}))
                  else
                    type_name = XML_TYPE_NAMES[value.class.to_s]