Update Parserv3.h

Parserv3.h

@@ -11,6 +11,11 @@ class Relation
 {
 	string name;
 	
+	public: 
+		Relation()
+		{
+		}
+		
 		Relation(string str)
 		{
 			name = str;
@@ -26,13 +31,33 @@ class Relation
 		}
 };
 
+class Attribute
+{
+	string name;
 	
+	public:
+		Attribute(string str)
+		{
+			name = str;
+		}
+		
+		void setAttribute(string str)
+		{
+			name = str;
+		}
+		
+		string getAttribute()
+		{
+			return name;
+		}
+};
 
 class Union
 {
 	string Un1;
 	string Un2;
 	
+	public:
 		Union (string s1, string s2)
 		{
 			Un1 = s1;
@@ -50,6 +75,7 @@ class Product
 	string Pr1;
 	string Pr2;
 	
+	public:
 		Product(string s1, string s2)
 		{
 			Pr1 = s1;
@@ -67,6 +93,7 @@ class Difference
 	string D1;
 	string D2;
 	
+	public:
 		Difference(string s1, string s2)
 		{
 			D1 = s1;
@@ -84,6 +111,7 @@ class Renaming
 	string newName;
 	string oldName;
 	
+	public:
 		Renaming(string s1, string s2)
 		{
 			newName = s1;
@@ -101,6 +129,7 @@ class Projection
 	string newName;
 	string oldName;
 	
+	public:
 		Projection(string s1, string s2)
 		{
 			newName = s1;
@@ -216,6 +245,11 @@ class Condition
 {
 	string cond;
 	public:
+	
+		Condition()
+		{
+		}
+	
 		Condition(string str)
 		{
 			cond = str;
@@ -246,3 +280,29 @@ class Selection
 			return select;
 		}
 };
+
+class Expression
+{
+	string exp;
+	
+	public:
+	
+		Expression()
+		{
+		}
+	
+		Expression(string str)
+		{
+			exp = str;
+		}
+		
+		void setExpression(string str)
+		{
+			exp = str;
+		}
+		
+		string getExpression()
+		{
+			return exp;
+		}
+};