string_or_ref.rb in ogc-gml-1.0.1

- old
+ new

@@ -1,15 +1,14 @@
 # frozen_string_literal: true
 
-# --- string_or_ref_type.rb ---
-require "shale"
+require "lutaml/model"
 
 module Ogc
   module Gml
-    class StringOrRef < Shale::Mapper
-      attribute :content, Shale::Type::String
-      attribute :nil_reason, Shale::Type::Value
-      attribute :remote_schema, Shale::Type::Value
+    class StringOrRef < Lutaml::Model::Serializable
+      attribute :content, :string
+      attribute :nil_reason, :string
+      attribute :remote_schema, :string
 
       xml do
         root "status"
         namespace "http://www.opengis.net/gml/3.2", "gml"
 