diff --git a/include/yaml-cpp/value/detail/node.h b/include/yaml-cpp/value/detail/node.h
index 006f50c..f56ab1c 100644
--- a/include/yaml-cpp/value/detail/node.h
+++ b/include/yaml-cpp/value/detail/node.h
@@ -22,6 +22,8 @@ namespace YAML
 			node(): m_pRef(new node_ref) {}
 
 			bool is(const node& rhs) const { return m_pRef == rhs.m_pRef; }
+			const node_ref *ref() const { return m_pRef.get(); }
+			
 			ValueType::value type() const { return m_pRef->type(); }
 			
 			const std::string& scalar() const { return m_pRef->scalar(); }
diff --git a/include/yaml-cpp/value/value.h b/include/yaml-cpp/value/value.h
index 5235bf4..8ef3218 100644
--- a/include/yaml-cpp/value/value.h
+++ b/include/yaml-cpp/value/value.h
@@ -18,6 +18,7 @@ namespace YAML
 	{
 	public:
 		friend class ValueBuilder;
+		friend class ValueEvents;
 		friend class detail::node_data;
 		template<typename, typename, typename> friend class detail::iterator_base;
 		
diff --git a/src/value/valueevents.cpp b/src/value/valueevents.cpp
new file mode 100644
index 0000000..a5f512f
--- /dev/null
+++ b/src/value/valueevents.cpp
@@ -0,0 +1,22 @@
+#include "valueevents.h"
+
+namespace YAML
+{
+	ValueEvents::ValueEvents(const Value& value): m_pMemory(value.m_pMemory), m_root(*value.m_pNode)
+	{
+		Visit(m_root);
+	}
+
+	void Visit(detail::node& node)
+	{
+		int& refCount = m_refCount[node.ref()];
+		refCount++;
+		if(refCount > 1)
+			return;
+		
+		if(node.type() == ValueType::Sequence) {
+			
+		} else if(node.type() == ValueType::Map) {
+		}
+	}
+}
diff --git a/src/value/valueevents.h b/src/value/valueevents.h
new file mode 100644
index 0000000..15846bf
--- /dev/null
+++ b/src/value/valueevents.h
@@ -0,0 +1,35 @@
+#ifndef VALUE_VALUEEVENTS_H_62B23520_7C8E_11DE_8A39_0800200C9A66
+#define VALUE_VALUEEVENTS_H_62B23520_7C8E_11DE_8A39_0800200C9A66
+
+#if defined(_MSC_VER) || (defined(__GNUC__) && (__GNUC__ == 3 && __GNUC_MINOR__ >= 4) || (__GNUC__ >= 4)) // GCC supports "pragma once" correctly since 3.4
+#pragma once
+#endif
+
+#include "yaml-cpp/anchor.h"
+#include "yaml-cpp/value/ptr.h"
+#include <multiset>
+#include <vector>
+
+namespace YAML
+{
+	class Value;
+	
+	class ValueEvents
+	{
+	public:
+		ValueEvents(const Value& value);
+		
+	private:
+		void Visit(detail::node& node);
+		
+	private:
+		detail::shared_memory_holder m_pMemory;
+		detail::node& m_root;
+		
+		typedef std::map<const detail::node_ref *, int> RefCount;
+		RefCount m_refCount;
+	};
+}
+
+#endif // VALUE_VALUEEVENTS_H_62B23520_7C8E_11DE_8A39_0800200C9A66
+