27 #include "../../datatype/SimpleData.h" 
This class models a string Literal value. 
 
A class that models a Literal String value. 
 
Literal & operator=(const Literal &rhs)
 
Expression * clone() const 
It creates a new copy of this expression. 
 
SimpleData< std::string, STRING_TYPE > String
 
TE_DEFINE_VISITABLE LiteralString(const std::string &s)
Constructor. 
 
LiteralString & operator=(const LiteralString &rhs)
 
This class models a literal value. 
 
This is an abstract class that models a query expression.