diff --git a/lib/fb_graph2/attribute_assigner.rb b/lib/fb_graph2/attribute_assigner.rb
index 5fe63e5..b18cea0 100644
--- a/lib/fb_graph2/attribute_assigner.rb
+++ b/lib/fb_graph2/attribute_assigner.rb
@@ -5,14 +5,26 @@ module FbGraph2
     included do
       extend ClassMethods
       attr_accessor :raw_attributes
-      cattr_accessor :registered_attributes
     end
 
     module ClassMethods
       def register_attributes(attributes)
-        self.registered_attributes = attributes
+        @registered_attributes ||= {}
+        attributes.each do |type, keys|
+          @registered_attributes[type] ||= []
+          @registered_attributes[type] += keys
+        end
         send :attr_accessor, *attributes.values.flatten
       end
+
+      def registered_attributes
+        @registered_attributes
+      end
+
+      def inherited(child)
+        super
+        child.register_attributes registered_attributes
+      end
     end
 
     def assign(attributes)
diff --git a/lib/fb_graph2/struct/app_link.rb b/lib/fb_graph2/struct/app_link.rb
index 7ebf2f8..262011a 100644
--- a/lib/fb_graph2/struct/app_link.rb
+++ b/lib/fb_graph2/struct/app_link.rb
@@ -14,6 +14,8 @@ module FbGraph2
           register_attributes(
             raw: [:app_store_id]
           )
+          class IPhone < IOS; end
+          class IPad < IOS; end
         end
 
         class Android < Native
@@ -24,7 +26,7 @@ module FbGraph2
 
         class WindowsPhone < Native
           register_attributes(
-            raw: [:app_name]
+            raw: [:app_id]
           )
         end
       end
diff --git a/spec/fb_graph2/node_spec.rb b/spec/fb_graph2/node_spec.rb
index 2b47c6f..5d801eb 100644
--- a/spec/fb_graph2/node_spec.rb
+++ b/spec/fb_graph2/node_spec.rb
@@ -60,7 +60,6 @@ describe FbGraph2::Node do
     subject { klass }
     it { should_not respond_to :register_attributes }
     it { should_not respond_to :registered_attributes }
-    it { should_not respond_to :registered_attributes= }
   end
 
   context 'instance' do
diff --git a/spec/fb_graph2/node_subclass_spec.rb b/spec/fb_graph2/node_subclass_spec.rb
index 15d651d..9dbcbef 100644
--- a/spec/fb_graph2/node_subclass_spec.rb
+++ b/spec/fb_graph2/node_subclass_spec.rb
@@ -13,7 +13,6 @@ describe FbGraph2::NodeSubClass do
     subject { klass }
     it { should respond_to :register_attributes }
     it { should respond_to :registered_attributes }
-    it { should respond_to :registered_attributes= }
   end
 
   context 'instance' do
diff --git a/spec/fb_graph2/struct/app_link_spec.rb b/spec/fb_graph2/struct/app_link_spec.rb
new file mode 100644
index 0000000..f735648
--- /dev/null
+++ b/spec/fb_graph2/struct/app_link_spec.rb
@@ -0,0 +1,30 @@
+require 'spec_helper'
+
+describe FbGraph2::Struct::AppLink do
+  subject { described_class }
+  its(:registered_attributes) { should == {raw: [:url]} }
+
+  describe FbGraph2::Struct::AppLink::Native do
+    its(:registered_attributes) { should == {raw: [:url, :app_name]} }
+  end
+
+  describe FbGraph2::Struct::AppLink::Native::IOS do
+    its(:registered_attributes) { should == {raw: [:url, :app_name, :app_store_id]} }
+
+    describe FbGraph2::Struct::AppLink::Native::IOS::IPhone do
+      its(:registered_attributes) { should == {raw: [:url, :app_name, :app_store_id]} }
+    end
+  end
+
+  describe FbGraph2::Struct::AppLink::Native::Android do
+    its(:registered_attributes) { should == {raw: [:url, :app_name, :class, :package]} }
+  end
+
+  describe FbGraph2::Struct::AppLink::Native::WindowsPhone do
+    its(:registered_attributes) { should == {raw: [:url, :app_name, :app_id]} }
+  end
+
+  describe FbGraph2::Struct::AppLink::Web do
+    its(:registered_attributes) { should == {raw: [:url, :should_fallback]} }
+  end
+end
\ No newline at end of file