10 files changed, 45 insertions, 17 deletions
diff --git a/include/plist/Array.h b/include/plist/Array.h
index f990928..106555d 100644
--- a/include/plist/Array.h
+++ b/include/plist/Array.h
@@ -34,9 +34,11 @@ class Array : public Structure
 	Array();
 	Array(plist_t node);
 	Array(Array& a);
-	Array& operator=(const Array& a);
+	Array& operator=(Array& a);
 	virtual ~Array();
-	
+
+	Node* Clone();
+
 	Node* operator[](unsigned int index);
 	void Append(Node* node);
 	void Insert(Node* node, unsigned int pos);
diff --git a/include/plist/Boolean.h b/include/plist/Boolean.h
index 01b5b85..917bc9d 100644
--- a/include/plist/Boolean.h
+++ b/include/plist/Boolean.h
@@ -32,9 +32,13 @@ class Boolean : public Node
     public :
 	Boolean();
 	Boolean(plist_t node);
+	Boolean(Boolean& b);
+	Boolean& operator=(Boolean& b);
 	Boolean(bool b);
 	virtual ~Boolean();
 
+	Node* Clone();
+
 	void SetValue(bool b);
 	bool GetValue();
 };
diff --git a/include/plist/Data.h b/include/plist/Data.h
index 92bda0a..86a26d9 100644
--- a/include/plist/Data.h
+++ b/include/plist/Data.h
@@ -33,10 +33,14 @@ class Data : public Node
     public :
 	Data();
 	Data(plist_t node);
-	Data(std::vector<char>& buff);
+	Data(Data& d);
+	Data& operator=(Data& d);
+	Data(const std::vector<char>& buff);
 	virtual ~Data();
 
-	void SetValue(std::vector<char>& buff);
+	Node* Clone();
+
+	void SetValue(const std::vector<char>& buff);
 	std::vector<char> GetValue();
 };
 
diff --git a/include/plist/Date.h b/include/plist/Date.h
index 78d8601..e9645aa 100644
--- a/include/plist/Date.h
+++ b/include/plist/Date.h
@@ -32,9 +32,13 @@ class Date : public Node
     public :
 	Date();
 	Date(plist_t node);
+	Date(Date& d);
+	Date& operator=(Date& d);
 	Date(uint64_t i);
 	virtual ~Date();
 
+	Node* Clone();
+
 	void SetValue(uint64_t i);
 	uint64_t GetValue();
 };
diff --git a/include/plist/Dictionary.h b/include/plist/Dictionary.h
index 8468ab5..6169774 100644
--- a/include/plist/Dictionary.h
+++ b/include/plist/Dictionary.h
@@ -35,17 +35,19 @@ class Dictionary : public Structure
 	Dictionary();
 	Dictionary(plist_t node);
 	Dictionary(Dictionary& d);
-	Dictionary& operator=(const Dictionary& d);
+	Dictionary& operator=(Dictionary& d);
 	virtual ~Dictionary();
-	
+
+	Node* Clone();
+
 	typedef std::map<std::string,Node*>::iterator iterator;
 	
-	Node* operator[](std::string& key);
+	Node* operator[](const std::string& key);
 	iterator Begin();
 	iterator End();
-	void Insert(std::string& key, Node* node);
+	void Insert(const std::string& key, Node* node);
 	void Remove(Node* node);
-	void Remove(std::string& key);
+	void Remove(const std::string& key);
 	
     private :
 	std::map<std::string,Node*> _map;
diff --git a/include/plist/Integer.h b/include/plist/Integer.h
index 823e3a0..3a3a0e3 100644
--- a/include/plist/Integer.h
+++ b/include/plist/Integer.h
@@ -32,9 +32,13 @@ class Integer : public Node
     public :
 	Integer();
 	Integer(plist_t node);
+	Integer(Integer& i);
+	Integer& operator=(Integer& i);
 	Integer(uint64_t i);
 	virtual ~Integer();
 
+	Node* Clone();
+
 	void SetValue(uint64_t i);
 	uint64_t GetValue();
 };
diff --git a/include/plist/Node.h b/include/plist/Node.h
index 3be900a..a59d469 100644
--- a/include/plist/Node.h
+++ b/include/plist/Node.h
@@ -31,11 +31,11 @@ class Node
 {
     public :
 	virtual ~Node();
-	Node(Node& node);
-	Node& operator=(const Node& node);
-	
+
+	virtual Node* Clone() = 0;
+
 	plist_type GetType();
-	plist_t GetPlist() const;
+	plist_t GetPlist();
 	
     protected:
 	Node();
diff --git a/include/plist/Real.h b/include/plist/Real.h
index 8d898c7..c0095e4 100644
--- a/include/plist/Real.h
+++ b/include/plist/Real.h
@@ -32,9 +32,13 @@ class Real : public Node
     public :
 	Real();
 	Real(plist_t node);
+	Real(Real& d);
+	Real& operator=(Real& d);
 	Real(double d);
 	virtual ~Real();
 
+	Node* Clone();
+
 	void SetValue(double d);
 	double GetValue();
 };
diff --git a/include/plist/String.h b/include/plist/String.h
index 5314065..769c98b 100644
--- a/include/plist/String.h
+++ b/include/plist/String.h
@@ -33,10 +33,14 @@ class String : public Node
     public :
 	String();
 	String(plist_t node);
-	String(std::string& s);
+	String(String& s);
+	String& operator=(String& s);
+	String(const std::string& s);
 	virtual ~String();
 
-	void SetValue(std::string& s);
+	Node* Clone();
+
+	void SetValue(const std::string& s);
 	std::string GetValue();
 };
 
diff --git a/include/plist/Utils.h b/include/plist/Utils.h
index b499635..f3e2685 100644
--- a/include/plist/Utils.h
+++ b/include/plist/Utils.h
@@ -30,8 +30,8 @@ namespace PList
     class Utils
     {
 	public:
-	    static Structure* FromXml(std::string& in);
-	    static Structure* FromBin(std::vector<char>& in);
+	    static Structure* FromXml(const std::string& in);
+	    static Structure* FromBin(const std::vector<char>& in);
 
 	private:
 	    Utils();