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diff --git a/dmxloader/dmxserializationdictionary.h b/dmxloader/dmxserializationdictionary.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+//=============================================================================
+
+#ifndef DMXSERIALIZATIONDICTIONARY_H
+#define DMXSERIALIZATIONDICTIONARY_H
+
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "tier1/utlrbtree.h"
+
+
+//-----------------------------------------------------------------------------
+// Forward declarations
+//-----------------------------------------------------------------------------
+class CDmxElement;
+
+
+//-----------------------------------------------------------------------------
+// Element dictionary used in unserialization
+//-----------------------------------------------------------------------------
+typedef int DmxSerializationHandle_t;
+enum
+{
+	DMX_SERIALIZATION_HANDLE_INVALID = (DmxSerializationHandle_t)~0
+};
+
+
+//-----------------------------------------------------------------------------
+// Element dictionary used in serialization
+//-----------------------------------------------------------------------------
+class CDmxSerializationDictionary
+{
+public:
+	CDmxSerializationDictionary( int nElementsHint = 0 );
+
+	// Creates the list of all things to serialize
+	void BuildElementList( CDmxElement *pRoot, bool bFlatMode );
+
+	// Should I inline the serialization of this element?
+	bool ShouldInlineElement( CDmxElement *pElement );
+
+	// Clears the dictionary
+	void Clear();
+
+	// Iterates over all root elements to serialize
+	DmxSerializationHandle_t FirstRootElement() const;
+	DmxSerializationHandle_t NextRootElement( DmxSerializationHandle_t h ) const;
+ 	CDmxElement* GetRootElement( DmxSerializationHandle_t h );
+
+	// Finds the handle of the element
+	DmxSerializationHandle_t Find( CDmxElement *pElement );
+
+	// How many root elements do we have?
+	int RootElementCount() const;
+
+private:
+	struct DmxElementInfo_t
+	{
+		CDmxElement* m_pElement;
+		bool m_bRoot;
+	};
+
+	// Creates the list of all things to serialize
+	void BuildElementList_R( CDmxElement *pRoot, bool bFlatMode, bool bIsRoot );
+	static bool LessFunc( const DmxElementInfo_t &lhs, const DmxElementInfo_t &rhs );
+
+	CUtlRBTree< DmxElementInfo_t, DmxSerializationHandle_t > m_Dict;
+};
+
+
+#endif // DMXSERIALIZATIONDICTIONARY_H