diff --git a/CMakeLists.txt b/CMakeLists.txt
index 12b3d27..983f2b7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -28,18 +28,35 @@ include_directories(.)
 #Create src file list
 set(src_files
 	ejson/debug.cpp
+	ejson/debug.h
 	ejson/ejson.cpp
+	ejson/ejson.h
 	ejson/Array.cpp
+	ejson/Array.h
 	ejson/Boolean.cpp
+	ejson/Boolean.h
 	ejson/Null.cpp
+	ejson/Null.h
 	ejson/Number.cpp
+	ejson/Number.h
 	ejson/String.cpp
+	ejson/String.h
 	ejson/Object.cpp
+	ejson/Object.h
 	ejson/Value.cpp
+	ejson/Value.h
 )
 
 add_definitions( -DDEBUG_LEVEL=3 )
 add_definitions( -DDEBUG=1 )
+if (APPLE)
+	add_definitions( -D__TARGET_OS__MacOs )
+elseif (UNIX)
+	add_definitions( -D__TARGET_OS__Linux )
+elseif (WIN32)
+	add_definitions( -D__TARGET_OS__Windows )
+endif ()
+
 
 include_directories(${etk_SOURCE_DIR})
 include_directories(${linearmath_SOURCE_DIR}/bullet/src/)
diff --git a/ejson/Array.h b/ejson/Array.h
old mode 100644
new mode 100755
index fdc63d3..00eda2f
--- a/ejson/Array.h
+++ b/ejson/Array.h
@@ -10,8 +10,6 @@
 #define __ETK_JSON_ARRAY_H__
 
 #include <etk/types.h>
-#include <etk/types.h>
-#include <etk/math/Vector2D.h>
 #include <ejson/Value.h>
 
 namespace ejson {
@@ -165,16 +163,6 @@ namespace ejson {
 		public: // herited function :
 			virtual bool iParse(const std::string& _data, size_t& _pos, ejson::filePos& _filePos, ejson::Document& _doc);
 			virtual bool iGenerate(std::string& _data, size_t _indent) const;
-			virtual enum nodeType getType(void) const {
-				return typeArray;
-			};
-			virtual ejson::Array* toArray(void) {
-				return this;
-			};
-			//! @previous
-			virtual const ejson::Array* toArray(void) const {
-				return this;
-			};
 			virtual void clear(void);
 			virtual bool transfertIn(ejson::Value* _obj);
 			virtual ejson::Value* duplicate(void) const;
diff --git a/ejson/Boolean.h b/ejson/Boolean.h
old mode 100644
new mode 100755
index 8440ec2..d742e51
--- a/ejson/Boolean.h
+++ b/ejson/Boolean.h
@@ -10,8 +10,6 @@
 #define __ETK_JSON_BOOLEAN_H__
 
 #include <etk/types.h>
-#include <etk/types.h>
-#include <etk/math/Vector2D.h>
 #include <ejson/Value.h>
 
 namespace ejson {
@@ -50,16 +48,6 @@ namespace ejson {
 		public: // herited function :
 			virtual bool iParse(const std::string& _data, size_t& _pos, ejson::filePos& _filePos, ejson::Document& _doc);
 			virtual bool iGenerate(std::string& _data, size_t _indent) const;
-			virtual enum nodeType getType(void) const {
-				return typeString;
-			};
-			virtual ejson::Boolean* toBoolean(void) {
-				return this;
-			};
-			//! @previous
-			virtual const ejson::Boolean* toBoolean(void) const{
-				return this;
-			};
 			virtual bool transfertIn(ejson::Value* _obj);
 			virtual ejson::Value* duplicate(void) const;
 	};
diff --git a/ejson/Null.h b/ejson/Null.h
old mode 100644
new mode 100755
index 44d2b57..12d68e0
--- a/ejson/Null.h
+++ b/ejson/Null.h
@@ -10,8 +10,6 @@
 #define __ETK_JSON_NULL_H__
 
 #include <etk/types.h>
-#include <etk/types.h>
-#include <etk/math/Vector2D.h>
 #include <ejson/Value.h>
 
 namespace ejson {
@@ -28,16 +26,6 @@ namespace ejson {
 		public: // herited function :
 			virtual bool iParse(const std::string& _data, size_t& _pos, ejson::filePos& _filePos, ejson::Document& _doc);
 			virtual bool iGenerate(std::string& _data, size_t _indent) const;
-			virtual enum nodeType getType(void) const {
-				return typeString;
-			};
-			virtual ejson::Null* toNull(void) {
-				return this;
-			};
-			//! @previous
-			virtual const ejson::Null* toNull(void) const{
-				return this;
-			};
 			virtual bool transfertIn(ejson::Value* _obj);
 			virtual ejson::Value* duplicate(void) const;
 	};
diff --git a/ejson/Number.h b/ejson/Number.h
old mode 100644
new mode 100755
index 760f497..038229a
--- a/ejson/Number.h
+++ b/ejson/Number.h
@@ -10,8 +10,6 @@
 #define __ETK_JSON_NUMBER_H__
 
 #include <etk/types.h>
-#include <etk/types.h>
-#include <etk/math/Vector2D.h>
 #include <ejson/Value.h>
 
 namespace ejson {
@@ -62,16 +60,6 @@ namespace ejson {
 		public: // herited function :
 			virtual bool iParse(const std::string& _data, size_t& _pos, ejson::filePos& _filePos, ejson::Document& _doc);
 			virtual bool iGenerate(std::string& _data, size_t _indent) const;
-			virtual enum nodeType getType(void) const {
-				return typeString;
-			};
-			virtual ejson::Number* toNumber(void) {
-				return this;
-			};
-			//! @previous
-			virtual const ejson::Number* toNumber(void) const{
-				return this;
-			};
 			virtual bool transfertIn(ejson::Value* _obj);
 			virtual ejson::Value* duplicate(void) const;
 	};
diff --git a/ejson/Object.cpp b/ejson/Object.cpp
index 1e48765..3edfd26 100644
--- a/ejson/Object.cpp
+++ b/ejson/Object.cpp
@@ -20,12 +20,12 @@
 #define __class__	"Object"
 
 void ejson::Object::clear(void) {
-	for (int32_t iii=0; iii<m_value.size(); ++iii) {
-		if (NULL == m_value[iii]) {
+	for(auto &it : m_value) {
+		if (it.second == NULL) {
 			continue;
 		}
-		delete(m_value[iii]);
-		m_value[iii] = NULL;
+		delete(it.second);
+		it.second = NULL;
 	}
 	m_value.clear();
 }
@@ -209,8 +209,8 @@ bool ejson::Object::iGenerate(std::string& _data, size_t _indent) const {
 	} else if (_indent<=1) {
 		oneLine=false;
 	} else {
-		for (int32_t iii=0; iii<m_value.size() ; iii++) {
-			ejson::Value* tmp = m_value[iii];
+		for(auto it = m_value.begin(); it != m_value.end(); ++it) {
+			ejson::Value* tmp = it->second;
 			if (tmp == NULL) {
 				continue;
 			}
@@ -224,9 +224,9 @@ bool ejson::Object::iGenerate(std::string& _data, size_t _indent) const {
 			}
 			if (true == tmp->isString()) {
 				ejson::String* tmp2 = tmp->toString();
-				if (NULL!=tmp2) {
+				if (tmp2 != NULL) {
 					if(    tmp2->get().size()>25
-					    || m_value.getKey(iii).size()>25) {
+					    || it->first.size()>25) {
 						oneLine=false;
 						break;
 					}
@@ -239,15 +239,17 @@ bool ejson::Object::iGenerate(std::string& _data, size_t _indent) const {
 	} else {
 		_data += "{\n";
 	}
-	for (int32_t iii=0; iii<m_value.size() ; iii++) {
+	for(auto it = m_value.begin();
+	    it != m_value.end();
+	    ++it) {
 		if (false == oneLine) {
 			addIndent(_data, _indent);
 		}
 		_data += "\"";
-		_data += m_value.getKey(iii);
+		_data += it->first;
 		_data += "\": ";
-		m_value.getValue(iii)->iGenerate(_data, _indent+1);
-		if (iii<m_value.size()-1) {
+		it->second->iGenerate(_data, _indent+1);
+		if (it != m_value.end()) {
 			_data += ",";
 		}
 		if (true == oneLine) {
@@ -264,85 +266,111 @@ bool ejson::Object::iGenerate(std::string& _data, size_t _indent) const {
 }
 
 bool ejson::Object::exist(const std::string& _name) const {
-	return m_value.exist(_name);
+	return m_value.find(_name) != m_value.end();
 }
 
 ejson::Value* ejson::Object::get(const std::string& _name) {
-	if (false == m_value.exist(_name)) {
+	auto it = m_value.find(_name);
+	if (it == m_value.end()) {
 		return NULL;
 	}
-	return m_value[_name];
+	return it->second;
 }
 
 const ejson::Value* ejson::Object::get(const std::string& _name) const {
-	if (false == m_value.exist(_name)) {
+	auto it = m_value.find(_name);
+	if (it == m_value.end()) {
 		return NULL;
 	}
-	return m_value[_name];
+	return it->second;
 }
 
 ejson::Object* ejson::Object::getObject(const std::string& _name) {
-	ejson::Value* tmp = get(_name);
-	if (NULL == tmp) {
+	auto it = m_value.find(_name);
+	if (it == m_value.end()) {
 		return NULL;
 	}
-	return tmp->toObject();
+	if (NULL == it->second) {
+		return NULL;
+	}
+	return dynamic_cast<ejson::Object*>(it->second);
 }
 
 const ejson::Object* ejson::Object::getObject(const std::string& _name) const {
-	const ejson::Value* tmp = get(_name);
-	if (NULL == tmp) {
+	auto it = m_value.find(_name);
+	if (it == m_value.end()) {
 		return NULL;
 	}
-	return tmp->toObject();
+	if (NULL == it->second) {
+		return NULL;
+	}
+	return dynamic_cast<const ejson::Object*>(it->second);
 }
 
 ejson::Array* ejson::Object::getArray(const std::string& _name) {
-	ejson::Value* tmp = get(_name);
-	if (NULL == tmp) {
+	auto it = m_value.find(_name);
+	if (it == m_value.end()) {
 		return NULL;
 	}
-	return tmp->toArray();
+	if (NULL == it->second) {
+		return NULL;
+	}
+	return dynamic_cast<ejson::Array*>(it->second);
 }
 
 const ejson::Array* ejson::Object::getArray(const std::string& _name) const {
-	const ejson::Value* tmp = get(_name);
-	if (NULL == tmp) {
+	auto it = m_value.find(_name);
+	if (it == m_value.end()) {
 		return NULL;
 	}
-	return tmp->toArray();
+	if (NULL == it->second) {
+		return NULL;
+	}
+	return dynamic_cast<const ejson::Array*>(it->second);
 }
 
 ejson::Null* ejson::Object::getNull(const std::string& _name) {
-	ejson::Value* tmp = get(_name);
-	if (NULL == tmp) {
+	auto it = m_value.find(_name);
+	if (it == m_value.end()) {
 		return NULL;
 	}
-	return tmp->toNull();
+	if (NULL == it->second) {
+		return NULL;
+	}
+	return dynamic_cast<ejson::Null*>(it->second);
 }
 
 const ejson::Null* ejson::Object::getNull(const std::string& _name) const {
-	const ejson::Value* tmp = get(_name);
-	if (NULL == tmp) {
+	auto it = m_value.find(_name);
+	if (it == m_value.end()) {
 		return NULL;
 	}
-	return tmp->toNull();
+	if (NULL == it->second) {
+		return NULL;
+	}
+	return dynamic_cast<const ejson::Null*>(it->second);
 }
 
 ejson::String* ejson::Object::getString(const std::string& _name) {
-	ejson::Value* tmp = get(_name);
-	if (NULL == tmp) {
+	auto it = m_value.find(_name);
+	if (it == m_value.end()) {
 		return NULL;
 	}
-	return tmp->toString();
+	if (NULL == it->second) {
+		return NULL;
+	}
+	return dynamic_cast<ejson::String*>(it->second);
 }
 
 const ejson::String* ejson::Object::getString(const std::string& _name) const {
-	const ejson::Value* tmp = get(_name);
-	if (NULL == tmp) {
+	auto it = m_value.find(_name);
+	if (it == m_value.end()) {
 		return NULL;
 	}
-	return tmp->toString();
+	if (NULL == it->second) {
+		return NULL;
+	}
+	return dynamic_cast<const ejson::String*>(it->second);
 }
 
 const std::string& ejson::Object::getStringValue(const std::string& _name) const {
@@ -418,13 +446,13 @@ bool ejson::Object::add(const std::string& _name, ejson::Value* _value) {
 	if (_name.size() == 0) {
 		return false;
 	}
-	if (m_value.exist(_name)) {
-		ejson::Value* tmp = m_value[_name];
-		delete(tmp);
-		m_value[_name] = _value;
+	auto it = m_value.find(_name);
+	if (it != m_value.end()) {
+		delete(it->second);
+		it->second = _value;
 		return true;
 	}
-	m_value.add(_name, _value);
+	m_value.insert(std::pair<std::string, ejson::Value*>(_name, _value));
 	return true;
 }
 
@@ -470,13 +498,11 @@ ejson::Value* ejson::Object::duplicate(void) const {
 		JSON_ERROR("Allocation error ...");
 		return NULL;
 	}
-	for (int32_t iii=0; iii<m_value.size(); ++iii) {
-		ejson::Value* val = m_value.getValue(iii);
-		std::string key = m_value.getKey(iii);
-		if (NULL == val) {
+	for(auto it = m_value.begin(); it != m_value.end(); ++it) {
+		if (it->second == NULL) {
 			continue;
 		}
-		output->add(key, val->duplicate());
+		output->add(it->first, it->second->duplicate());
 	}
 	return output;
 }
diff --git a/ejson/Object.h b/ejson/Object.h
old mode 100644
new mode 100755
index 8a8a17f..e593f37
--- a/ejson/Object.h
+++ b/ejson/Object.h
@@ -10,9 +10,8 @@
 #define __ETK_JSON_OBJECT_H__
 
 #include <etk/types.h>
-#include <etk/types.h>
-#include <etk/Hash.h>
-#include <etk/math/Vector2D.h>
+#include <map>
+#include <algorithm>
 #include <ejson/Value.h>
 
 namespace ejson {
@@ -27,7 +26,7 @@ namespace ejson {
 			 */
 			virtual ~Object(void) { };
 		protected:
-			etk::Hash<ejson::Value*> m_value; //!< value of the node (for element this is the name, for text it is the inside text ...)
+			std::map<std::string, ejson::Value*> m_value; //!< value of the node (for element this is the name, for text it is the inside text ...)
 		public:
 			// TODO : add direct id  access....
 			/**
@@ -52,12 +51,17 @@ namespace ejson {
 			const ejson::Value* operator[] (const std::string& _name) const {
 				return get(_name);
 			}
+		public:
 			/**
 			 * @brief Get all the element name (keys).
 			 * @return a vector of all name (key).
 			 */
 			std::vector<std::string> getKeys(void) const {
-				return m_value.getKeys();
+				std::vector<std::string> keys;
+				for (auto &it : m_value) {
+					keys.push_back(it.first);
+				}
+				return keys;
 			}
 			/**
 			 * @brief get the number of sub element in the current one
@@ -72,19 +76,31 @@ namespace ejson {
 			 * @return NULL if the element does not exist.
 			 */
 			ejson::Value* get(size_t _id) {
-				return m_value[_id];
+				size_t id = 0;
+				for(auto &it : m_value) {
+					if (id == _id) {
+						return it.second;
+					}
+				}
+				return NULL;
 			};
 			//! @previous
 			const ejson::Value* get(size_t _id) const{
-				return m_value[_id];
+				size_t id = 0;
+				for(auto &it : m_value) {
+					if (id == _id) {
+						return it.second;
+					}
+				}
+				return NULL;
 			};
 			//! @previous
 			ejson::Value* operator[] (size_t _id) {
-				return m_value[_id];
+				return get(_id);
 			}
 			//! @previous
 			const ejson::Value* operator[] (size_t _id) const {
-				return m_value[_id];
+				return get(_id);
 			}
 			/**
 			 * @brief Get the element name (key).
@@ -92,7 +108,13 @@ namespace ejson {
 			 * @return The name (key).
 			 */
 			std::string getKey(size_t _id) const {
-				return m_value.getKey(_id);
+				size_t id = 0;
+				for(auto it = m_value.begin(); it != m_value.end(); ++it, ++id) {
+					if (id == _id) {
+						return it->first;
+					}
+				}
+				return NULL;
 			}
 			/**
 			 * @brief get the sub element with his name (Casted as Object if it is possible)
@@ -207,16 +229,6 @@ namespace ejson {
 		public: // herited function :
 			virtual bool iParse(const std::string& _data, size_t& _pos, ejson::filePos& _filePos, ejson::Document& _doc);
 			virtual bool iGenerate(std::string& _data, size_t _indent) const;
-			virtual enum nodeType getType(void) const {
-				return typeObject;
-			};
-			virtual ejson::Object* toObject(void) {
-				return this;
-			};
-			//! @previous
-			virtual const ejson::Object* toObject(void) const{
-				return this;
-			};
 			virtual void clear(void);
 			virtual bool transfertIn(ejson::Value* _obj);
 			virtual ejson::Value* duplicate(void) const;
diff --git a/ejson/String.h b/ejson/String.h
old mode 100644
new mode 100755
index 0e7e10d..5bc06ad
--- a/ejson/String.h
+++ b/ejson/String.h
@@ -10,8 +10,6 @@
 #define __ETK_JSON_STRING_H__
 
 #include <etk/types.h>
-#include <etk/types.h>
-#include <etk/math/Vector2D.h>
 #include <ejson/Value.h>
 
 namespace ejson {
@@ -48,16 +46,6 @@ namespace ejson {
 		public: // herited function :
 			virtual bool iParse(const std::string& _data, size_t& _pos, ejson::filePos& _filePos, ejson::Document& _doc);
 			virtual bool iGenerate(std::string& _data, size_t _indent) const;
-			virtual enum nodeType getType(void) const {
-				return typeString;
-			};
-			virtual ejson::String* toString(void) {
-				return this;
-			};
-			//! @previous
-			virtual const ejson::String* toString(void) const {
-				return this;
-			};
 			virtual bool transfertIn(ejson::Value* _obj);
 			virtual ejson::Value* duplicate(void) const;
 	};
diff --git a/ejson/Value.cpp b/ejson/Value.cpp
index c2788db..e51447a 100644
--- a/ejson/Value.cpp
+++ b/ejson/Value.cpp
@@ -123,3 +123,46 @@ bool ejson::Value::checkNumber(char32_t _val) const {
 	return false;
 }
 
+
+ejson::Document* ejson::Value::toDocument(void) {
+	return dynamic_cast<ejson::Document*>(this);
+};
+const ejson::Document* ejson::Value::toDocument(void) const {
+	return dynamic_cast<const ejson::Document*>(this);
+};
+ejson::Array* ejson::Value::toArray(void) {
+	return dynamic_cast<ejson::Array*>(this);
+};
+const ejson::Array* ejson::Value::toArray(void) const{
+	return dynamic_cast<const ejson::Array*>(this);
+};
+ejson::Object* ejson::Value::toObject(void) {
+	return dynamic_cast<ejson::Object*>(this);
+};
+const ejson::Object* ejson::Value::toObject(void) const{
+	return dynamic_cast<const ejson::Object*>(this);
+};
+ejson::String* ejson::Value::toString(void) {
+	return dynamic_cast<ejson::String*>(this);
+};
+const ejson::String* ejson::Value::toString(void) const{
+	return dynamic_cast<const ejson::String*>(this);
+};
+ejson::Number* ejson::Value::toNumber(void) {
+	return dynamic_cast<ejson::Number*>(this);
+};
+const ejson::Number* ejson::Value::toNumber(void) const{
+	return dynamic_cast<const ejson::Number*>(this);
+};
+ejson::Boolean* ejson::Value::toBoolean(void) {
+	return dynamic_cast<ejson::Boolean*>(this);
+};
+const ejson::Boolean* ejson::Value::toBoolean(void) const{
+	return dynamic_cast<const ejson::Boolean*>(this);
+};
+ejson::Null* ejson::Value::toNull(void) {
+	return dynamic_cast<ejson::Null*>(this);
+};
+const ejson::Null* ejson::Value::toNull(void) const{
+	return dynamic_cast<const ejson::Null*>(this);
+};
\ No newline at end of file
diff --git a/ejson/Value.h b/ejson/Value.h
old mode 100644
new mode 100755
index 4724c55..2f2507d
--- a/ejson/Value.h
+++ b/ejson/Value.h
@@ -10,8 +10,6 @@
 #define __ETK_JSON_VALUE_H__
 
 #include <etk/types.h>
-#include <etk/types.h>
-#include <etk/math/Vector2D.h>
 
 namespace ejson {
 	//#define ENABLE_DISPLAY_PARSED_ELEMENT
@@ -32,18 +30,6 @@ namespace ejson {
 	class Null;
 	class Number;
 	class String;
-	
-	enum nodeType{
-		typeUnknow, //!< might be an error ...
-		typeValue, //!< XXXXXX:*
-		typeDocument, //!< all the file main access
-		typeArray, //!< [...]
-		typeString, //!< the "" 
-		typeNumber, //!< the -1565.21515
-		typeBoolean, //!< the true and false
-		typeNull, //!< the null element
-		typeObject, //!< the { ... }
-	};
 	//! @not-in-doc
 	class filePos {
 		private:
@@ -145,14 +131,6 @@ namespace ejson {
 			 * @return false if an error occured.
 			 */
 			virtual bool iGenerate(std::string& _data, size_t _indent) const = 0;
-		public:
-			/**
-			 * @brief get the node type.
-			 * @return the type of the Node.
-			 */
-			virtual enum nodeType getType(void) const {
-				return typeValue;
-			};
 		protected:
 			/**
 			 * @brief add indentation of the string input.
@@ -189,139 +167,111 @@ namespace ejson {
 			 * @brief Cast the element in a Value if it is possible.
 			 * @return pointer on the class or NULL.
 			 */
-			virtual ejson::Value* toValue(void) {
+			ejson::Value* toValue(void) {
 				return this;
 			};
 			//! @previous
-			virtual const ejson::Value* toValue(void) const {
+			const ejson::Value* toValue(void) const {
 				return this;
 			};
 			/**
 			 * @brief Cast the element in a Document if it is possible.
 			 * @return pointer on the class or NULL.
 			 */
-			virtual ejson::Document* toDocument(void) {
-				return NULL;
-			};
+			ejson::Document* toDocument(void);
 			//! @previous
-			virtual const ejson::Document* toDocument(void) const {
-				return NULL;
-			};
+			const ejson::Document* toDocument(void) const;
 			/**
 			 * @brief Cast the element in a Array if it is possible.
 			 * @return pointer on the class or NULL.
 			 */
-			virtual ejson::Array* toArray(void) {
-				return NULL;
-			};
+			ejson::Array* toArray(void);
 			//! @previous
-			virtual const ejson::Array* toArray(void) const{
-				return NULL;
-			};
+			const ejson::Array* toArray(void) const;
 			/**
 			 * @brief Cast the element in a Object if it is possible.
 			 * @return pointer on the class or NULL.
 			 */
-			virtual ejson::Object* toObject(void) {
-				return NULL;
-			};
+			ejson::Object* toObject(void);
 			//! @previous
-			virtual const ejson::Object* toObject(void) const{
-				return NULL;
-			};
+			const ejson::Object* toObject(void) const;
 			/**
 			 * @brief Cast the element in a String if it is possible.
 			 * @return pointer on the class or NULL.
 			 */
-			virtual ejson::String* toString(void) {
-				return NULL;
-			};
+			ejson::String* toString(void);
 			//! @previous
-			virtual const ejson::String* toString(void) const{
-				return NULL;
-			};
+			const ejson::String* toString(void) const;
 			/**
 			 * @brief Cast the element in a Number if it is possible.
 			 * @return pointer on the class or NULL.
 			 */
-			virtual ejson::Number* toNumber(void) {
-				return NULL;
-			};
+			ejson::Number* toNumber(void);
 			//! @previous
-			virtual const ejson::Number* toNumber(void) const{
-				return NULL;
-			};
+			const ejson::Number* toNumber(void) const;
 			/**
 			 * @brief Cast the element in a Boolean if it is possible.
 			 * @return pointer on the class or NULL.
 			 */
-			virtual ejson::Boolean* toBoolean(void) {
-				return NULL;
-			};
+			ejson::Boolean* toBoolean(void);
 			//! @previous
-			virtual const ejson::Boolean* toBoolean(void) const{
-				return NULL;
-			};
+			const ejson::Boolean* toBoolean(void) const;
 			/**
 			 * @brief Cast the element in a Null if it is possible.
 			 * @return pointer on the class or NULL.
 			 */
-			virtual ejson::Null* toNull(void) {
-				return NULL;
-			};
+			ejson::Null* toNull(void);
 			//! @previous
-			virtual const ejson::Null* toNull(void) const{
-				return NULL;
-			};
+			const ejson::Null* toNull(void) const;
 			
 			/**
 			 * @brief check if the node is a ejson::Document
 			 * @return true if the node is a ejson::Document
 			 */
 			bool isDocument(void) const {
-				return getType() == ejson::typeDocument;
+				return toDocument() != NULL;
 			};
 			/**
 			 * @brief check if the node is a ejson::Array
 			 * @return true if the node is a ejson::Array
 			 */
 			bool isArray(void) const {
-				return getType() == ejson::typeArray;
+				return toArray() != NULL;
 			};
 			/**
 			 * @brief check if the node is a ejson::Object
 			 * @return true if the node is a ejson::Object
 			 */
 			bool isObject(void) const {
-				return getType() == ejson::typeObject;
+				return toObject() != NULL;
 			};
 			/**
 			 * @brief check if the node is a ejson::String
 			 * @return true if the node is a ejson::String
 			 */
 			bool isString(void) const {
-				return getType() == ejson::typeString;
+				return toString() != NULL;
 			};
 			/**
 			 * @brief check if the node is a ejson::Number
 			 * @return true if the node is a ejson::Number
 			 */
 			bool isNumber(void) const {
-				return getType() == ejson::typeNumber;
+				return toNumber() != NULL;
 			};
 			/**
 			 * @brief check if the node is a ejson::Boolean
 			 * @return true if the node is a ejson::Boolean
 			 */
 			bool isBoolean(void) const {
-				return getType() == ejson::typeBoolean;
+				return toBoolean() != NULL;
 			};
 			/**
 			 * @brief check if the node is a ejson::Null
 			 * @return true if the node is a ejson::Null
 			 */
 			bool isNull(void) const {
-				return getType() == ejson::typeNull;
+				return toNull() != NULL;
 			};
 			
 			/**
@@ -353,5 +303,12 @@ namespace ejson {
 	};
 };
 
+#include <ejson/Array.h>
+#include <ejson/Boolean.h>
+#include <ejson/Null.h>
+#include <ejson/Number.h>
+#include <ejson/Object.h>
+#include <ejson/String.h>
+
 #endif
 
diff --git a/ejson/ejson.h b/ejson/ejson.h
old mode 100644
new mode 100755
index 3fdbc0a..12dc197
--- a/ejson/ejson.h
+++ b/ejson/ejson.h
@@ -76,17 +76,8 @@ namespace ejson {
 			void createError(const std::string& _data, size_t _pos, const ejson::filePos& _filePos, const std::string& _comment);
 			void displayError(void);
 		public: // herited function:
-			virtual enum nodeType getType(void) const {
-				return typeDocument;
-			};
 			virtual bool iParse(const std::string& _data, size_t& _pos, ejson::filePos& _filePos, ejson::Document& _doc);
 			virtual bool iGenerate(std::string& _data, size_t _indent) const;
-			virtual ejson::Document* toDocument(void) {
-				return this;
-			};
-			virtual const ejson::Document* toDocument(void) const {
-				return this;
-			};
 	};
 };