System.Windows.Markup

+namespace System.Windows.Markup {
+    public sealed class ValueSerializerAttribute : Attribute {
+        public ValueSerializerAttribute(string valueSerializerTypeName);
+        public ValueSerializerAttribute(Type valueSerializerType);
+        public Type ValueSerializerType { get; }
+        public string ValueSerializerTypeName { get; }
+    }
+}