diff --git a/include/osg/Identifier b/include/osg/Identifier
new file mode 100644
index 000000000..c9ec853c7
--- /dev/null
+++ b/include/osg/Identifier
@@ -0,0 +1,68 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2014 Robert Osfield
+ *
+ * This library is open source and may be redistributed and/or modified under
+ * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
+ * (at your option) any later version.  The full license is in LICENSE file
+ * included with this distribution, and on the openscenegraph.org website.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * OpenSceneGraph Public License for more details.
+*/
+
+#ifndef OSG_IDENTIFER_H
+#define OSG_IDENTIFER_H
+
+#include <osg/Referenced>
+#include <osg/Observer>
+
+#include <string>
+#include <cctype>
+
+#define OSG_HAS_IDENTIFIER
+
+namespace osg
+{
+
+/** helper function for doing a case insenstive compare of two strings.*/
+inline bool iequals(const std::string& lhs, const std::string& rhs)
+{
+    if (lhs.size()!=rhs.size()) return false;
+
+    for(std::string::size_type i=0; i<lhs.size(); ++i)
+    {
+        if (std::tolower(lhs[i])!=std::tolower(rhs[i])) return false;
+    }
+
+    return true;
+}
+
+
+/** Unique Indentifier class to help with efficiently comparing
+  * road classification or region via pointers.*/
+class Identifier : public osg::Referenced, public osg::Observer
+{
+public:
+    static Identifier* get(const std::string& name, int number=0, osg::Referenced* first=0, osg::Referenced* second=0);
+    static Identifier* get(int number, osg::Referenced* first=0, osg::Referenced* second=0);
+    static Identifier* get(osg::Referenced* first, osg::Referenced* second=0);
+
+    const std::string& name() const { return _name; }
+    const int& number() const { return _number; }
+
+protected:
+    Identifier(const std::string& name, int number, osg::Referenced* f, osg::Referenced* s);
+    virtual ~Identifier();
+
+    virtual void objectDeleted(void* ptr);
+
+    std::string _name;
+    int         _number;
+    osg::Referenced* _first;
+    osg::Referenced* _second;
+};
+
+}
+
+#endif
diff --git a/include/osg/ValueMap b/include/osg/ValueMap
new file mode 100644
index 000000000..9b9cd1728
--- /dev/null
+++ b/include/osg/ValueMap
@@ -0,0 +1,138 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2016 Robert Osfield
+ *
+ * This library is open source and may be redistributed and/or modified under
+ * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
+ * (at your option) any later version.  The full license is in LICENSE file
+ * included with this distribution, and on the openscenegraph.org website.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * OpenSceneGraph Public License for more details.
+*/
+
+#ifndef OSG_VALUEMAP
+#define OSG_VALUEMAP 1
+
+#include <osg/ValueObject>
+#include <osg/Notify>
+#include <map>
+
+namespace osg {
+
+#define OSG_HAS_VALUEMAP
+
+class OSG_EXPORT ValueMap : public osg::Object
+{
+    public:
+
+        ValueMap();
+
+        ValueMap(const ValueMap& vm, const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY);
+
+        META_Object(osg, ValueMap)
+
+        typedef std::map< osg::ref_ptr<const osg::Referenced>, osg::ref_ptr<osg::Object>  > KeyValueMap;
+
+        void setKeyValueMap(KeyValueMap& properties) { _keyValueMap = properties; }
+
+        KeyValueMap& getKeyValueMap() { return _keyValueMap; }
+
+        const KeyValueMap& getKeyValueMap() const { return _keyValueMap; }
+
+        osg::Object* setValue(const osg::Referenced* key, osg::Object* object)
+        {
+            return (_keyValueMap[key] = object).get();
+        }
+
+        template<typename T>
+        osg::Object* setValue(const osg::Referenced* key, const T& value)
+        {
+            typedef TemplateValueObject<T> UserValueObject;
+            KeyValueMap::iterator itr = _keyValueMap.find(key);
+            if (itr!=_keyValueMap.end() && typeid(*(itr->second))==typeid(UserValueObject))
+            {
+                UserValueObject* uvo = static_cast<UserValueObject*>(itr->second.get());
+                uvo->setValue(value);
+                return uvo;
+            }
+            else
+            {
+                return (_keyValueMap[key] = new UserValueObject(value)).get();
+            }
+        }
+
+
+        inline osg::Object* getValue(const osg::Referenced* key)
+        {
+            KeyValueMap::iterator itr = _keyValueMap.find(key);
+            return (itr!=_keyValueMap.end()) ? itr->second.get() : 0;
+        }
+
+        inline const osg::Object* getValue(const osg::Referenced* key) const
+        {
+            KeyValueMap::const_iterator itr = _keyValueMap.find(key);
+            return (itr!=_keyValueMap.end()) ? itr->second.get() : 0;
+        }
+
+
+        template<typename T>
+        T* getValueOfType(const osg::Referenced* key)
+        {
+            Object* object = getValue(key);
+            return (object && typeid(*object)==typeid(T)) ? static_cast<T*>(object) : 0;
+        }
+
+
+        template<typename T>
+        const T* getValueOfType(const osg::Referenced* key) const
+        {
+            const Object* object = getValue(key);
+            return (object && typeid(*object)==typeid(T)) ? static_cast<const T*>(object) : 0;
+        }
+
+
+        template<typename T>
+        bool getValue(const osg::Referenced* key, T& value)
+        {
+            typedef TemplateValueObject<T> UserValueObject;
+            UserValueObject* uvo = getValueOfType<UserValueObject>(key);
+            if (uvo)
+            {
+                value = uvo->getValue();
+                return true;
+            }
+            else
+            {
+                return false;
+            }
+        }
+
+        template<typename T>
+        bool getValue(const osg::Referenced* key, T& value) const
+        {
+            typedef TemplateValueObject<T> UserValueObject;
+            const UserValueObject* uvo = getValueOfType<UserValueObject>(key);
+            if (uvo)
+            {
+                value = uvo->getValue();
+                return true;
+            }
+            else
+            {
+                return false;
+            }
+        }
+
+
+    protected:
+
+        virtual ~ValueMap();
+
+        KeyValueMap _keyValueMap;
+
+};
+
+}
+
+#endif
diff --git a/include/osg/ValueStack b/include/osg/ValueStack
new file mode 100644
index 000000000..b180f3b03
--- /dev/null
+++ b/include/osg/ValueStack
@@ -0,0 +1,167 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2016 Robert Osfield
+ *
+ * This library is open source and may be redistributed and/or modified under
+ * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
+ * (at your option) any later version.  The full license is in LICENSE file
+ * included with this distribution, and on the openscenegraph.org website.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * OpenSceneGraph Public License for more details.
+*/
+
+#ifndef OSG_VALUESTACK
+#define OSG_VALUESTACK 1
+
+#include <osg/ValueMap>
+
+namespace osg {
+
+#define OSG_HAS_VALUESTACK
+
+class OSG_EXPORT ValueStack : public osg::Object
+{
+    public:
+
+        ValueStack();
+
+        ValueStack(const ValueStack& ps, const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY);
+
+        META_Object(osg, ValueStack)
+
+        typedef std::vector< osg::ref_ptr<Object> > Values;
+        typedef std::map< osg::ref_ptr<const osg::Referenced>, Values> ValueStackMap;
+
+        void setValueStackMap(ValueStackMap& pm) { _valuesMap = pm; }
+
+        ValueStackMap& getValueStackMap() { return _valuesMap; }
+
+        const ValueStackMap& getValueStackMap() const { return _valuesMap; }
+
+        inline void push(const Referenced* key, Object* value)
+        {
+            _valuesMap[key].push_back(value);
+        }
+
+        template<typename T>
+        void push(const osg::Referenced* key, const T& value)
+        {
+            typedef TemplateValueObject<T> UserValueObject;
+            _valuesMap[key].push_back(new UserValueObject(value));
+        }
+
+        inline void pop(const Referenced* key)
+        {
+            _valuesMap[key].pop_back();
+        }
+
+        inline void push(ValueMap* valueMap)
+        {
+            if (valueMap)
+            {
+                ValueMap::KeyValueMap& keyValueMap = valueMap->getKeyValueMap();
+                for(ValueMap::KeyValueMap::iterator itr = keyValueMap.begin();
+                    itr != keyValueMap.end();
+                    ++itr)
+                {
+                    push(itr->first.get(), itr->second.get());
+                }
+            }
+        }
+
+        inline void pop(ValueMap* valueMap)
+        {
+            if (valueMap)
+            {
+                ValueMap::KeyValueMap& keyValueMap = valueMap->getKeyValueMap();
+                for(ValueMap::KeyValueMap::iterator itr = keyValueMap.begin();
+                    itr != keyValueMap.end();
+                    ++itr)
+                {
+                    pop(itr->first.get());
+                }
+            }
+        }
+
+        inline osg::Object* getValue(const osg::Referenced* key)
+        {
+            ValueStackMap::iterator itr = _valuesMap.find(key);
+            if (itr==_valuesMap.end()) return 0;
+
+            Values& values = itr->second;
+            if (values.empty()) return 0;
+
+            return values.back().get();
+        }
+
+        inline const osg::Object* getValue(const osg::Referenced* key) const
+        {
+            ValueStackMap::const_iterator itr = _valuesMap.find(key);
+            if (itr==_valuesMap.end()) return 0;
+
+            const Values& values = itr->second;
+            if (values.empty()) return 0;
+
+            return values.back().get();
+        }
+
+        template<typename T>
+        T* getValueOfType(const osg::Referenced* key)
+        {
+            Object* object = getValue(key);
+            return (object && typeid(*object)==typeid(T)) ? static_cast<T*>(object) : 0;
+        }
+
+
+        template<typename T>
+        const T* getValueOfType(const osg::Referenced* key) const
+        {
+            const Object* object = getValue(key);
+            return (object && typeid(*object)==typeid(T)) ? static_cast<const T*>(object) : 0;
+        }
+
+        template<typename T>
+        bool getValue(const osg::Referenced* key, T& value)
+        {
+            typedef TemplateValueObject<T> UserValueObject;
+            UserValueObject* uvo = getValueOfType<UserValueObject>(key);
+            if (uvo)
+            {
+                value = uvo->getValue();
+                return true;
+            }
+            else
+            {
+                return false;
+            }
+        }
+
+        template<typename T>
+        bool getValue(const osg::Referenced* key, T& value) const
+        {
+            typedef TemplateValueObject<T> UserValueObject;
+            const UserValueObject* uvo = getValueOfType<UserValueObject>(key);
+            if (uvo)
+            {
+                value = uvo->getValue();
+                return true;
+            }
+            else
+            {
+                return false;
+            }
+        }
+
+    protected:
+
+        virtual ~ValueStack();
+
+        ValueStackMap _valuesMap;
+
+};
+
+
+}
+
+#endif
diff --git a/src/osg/Identifier.cpp b/src/osg/Identifier.cpp
new file mode 100644
index 000000000..a6f8a8e83
--- /dev/null
+++ b/src/osg/Identifier.cpp
@@ -0,0 +1,123 @@
+#include <osg/Identifier>
+
+#include <osg/ref_ptr>
+#include <osg/Notify>
+
+#include <OpenThreads/Mutex>
+
+#include <map>
+
+using namespace osg;
+
+struct IdentifierKey
+{
+    IdentifierKey(const std::string& str, int num, osg::Referenced* f, osg::Referenced* s):
+        name(str),
+        number(num),
+        first(f),
+        second(s)
+    {
+    }
+
+    const std::string       name;
+    const int               number;
+    const osg::Referenced*  first;
+    const osg::Referenced*  second;
+
+    bool operator < (const IdentifierKey& rhs) const
+    {
+        if (name<rhs.name) return true;
+        if (name>rhs.name) return false;
+
+        if (number<rhs.number) return true;
+        if (number>rhs.number) return false;
+
+        if (first<rhs.first) return true;
+        if (first>rhs.first) return false;
+
+        return (second<rhs.second);
+    }
+};
+
+
+typedef std::map<IdentifierKey, osg::ref_ptr<Identifier> > IdentifierMap;
+
+IdentifierMap  s_IdentifierMap;
+OpenThreads::Mutex s_IdentifierMapMutex;
+
+Identifier::Identifier(const std::string& name, int number, osg::Referenced* f, osg::Referenced* s):
+    _name(name),
+    _number(number),
+    _first(f),
+    _second(s)
+{
+    if (_first) _first->addObserver(this);
+    if (_second) _second->addObserver(this);
+}
+
+Identifier::~Identifier()
+{
+    if (_first) _first->removeObserver(this);
+    if (_second) _second->removeObserver(this);
+}
+
+void Identifier::objectDeleted(void* ptr)
+{
+    if (_first==ptr || _second==ptr)
+    {
+        IdentifierKey key(_name, _number, _first, _second);
+
+        {
+            OpenThreads::ScopedLock<OpenThreads::Mutex> lock(s_IdentifierMapMutex);
+            IdentifierMap::iterator itr = s_IdentifierMap.find(key);
+            if (itr!=s_IdentifierMap.end())
+            {
+                OSG_NOTICE<<"Warning : this = "<<this<<"  Identifier::objectDeleted("<<ptr<<") found and deleted from s_IdentifierMap, s_IdentifierMap.size()="<<s_IdentifierMap.size()<<std::endl;
+                s_IdentifierMap.erase(itr);
+            }
+            else
+            {
+                OSG_NOTICE<<"Warning : this = "<<this<<"  Identifier::objectDeleted("<<ptr<<") not found in s_IdentifierMap."<<s_IdentifierMap.size()<<std::endl;
+            }
+        }
+
+        if (_first==ptr && _second)
+        {
+            _second->removeObserver(this);
+        }
+
+        if (_second==ptr && _first)
+        {
+            _first->removeObserver(this);
+        }
+
+        _first = 0;
+        _second = 0;
+    }
+
+}
+
+
+Identifier* osg::Identifier::get(const std::string& name, int number, osg::Referenced* first, osg::Referenced* second)
+{
+    IdentifierKey key(name, number, first, second);
+
+    OpenThreads::ScopedLock<OpenThreads::Mutex> lock(s_IdentifierMapMutex);
+
+    IdentifierMap::iterator itr = s_IdentifierMap.find(key);
+    if (itr!=s_IdentifierMap.end()) return itr->second.get();
+
+    osg::ref_ptr<Identifier> identifier = new Identifier(name, number, first, second);
+    s_IdentifierMap[key] = identifier;
+    return identifier.get();
+}
+
+Identifier* osg::Identifier::get(int number, osg::Referenced* first, osg::Referenced* second)
+{
+    return get("", number, first, second);
+}
+
+Identifier* osg::Identifier::get(osg::Referenced* first, osg::Referenced* second)
+{
+    return get("", 0, first, second);
+}
diff --git a/src/osg/ValueMap.cpp b/src/osg/ValueMap.cpp
new file mode 100644
index 000000000..37b68f6dd
--- /dev/null
+++ b/src/osg/ValueMap.cpp
@@ -0,0 +1,36 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
+ *
+ * This library is open source and may be redistributed and/or modified under
+ * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
+ * (at your option) any later version.  The full license is in LICENSE file
+ * included with this distribution, and on the openscenegraph.org website.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * OpenSceneGraph Public License for more details.
+*/
+#include <osg/ValueStack>
+
+#include <stdlib.h>
+
+using namespace osg;
+
+ValueMap::ValueMap()
+{
+}
+
+ValueMap::ValueMap(const ValueMap& vm, const osg::CopyOp& copyop):
+    osg::Object(vm, copyop)
+{
+    for(KeyValueMap::const_iterator itr = vm._keyValueMap.begin();
+        itr != vm._keyValueMap.end();
+        ++itr)
+    {
+        _keyValueMap[itr->first] = osg::clone(itr->second.get(), copyop);
+    }
+}
+
+ValueMap::~ValueMap()
+{
+}
diff --git a/src/osg/ValueStack.cpp b/src/osg/ValueStack.cpp
new file mode 100644
index 000000000..9346bbe4e
--- /dev/null
+++ b/src/osg/ValueStack.cpp
@@ -0,0 +1,30 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
+ *
+ * This library is open source and may be redistributed and/or modified under
+ * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
+ * (at your option) any later version.  The full license is in LICENSE file
+ * included with this distribution, and on the openscenegraph.org website.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * OpenSceneGraph Public License for more details.
+*/
+#include <osg/ValueStack>
+
+#include <stdlib.h>
+
+using namespace osg;
+
+ValueStack::ValueStack()
+{
+}
+
+ValueStack::ValueStack(const ValueStack& ps, const osg::CopyOp& copyop):
+    osg::Object(ps, copyop)
+{
+}
+
+ValueStack::~ValueStack()
+{
+}