/// <summary>
/// Returns a string representation of the formula
/// </summary>
public override string FormulaRepresentation()
{
string strOperationType = GetWFSOperationTypeString();
string strLeftOperand = LeftOperand.FormulaRepresentation();
string strRightOperand = RightOperand.FormulaRepresentation();
string str = "(" + strLeftOperand + " " + strOperationType + " " + strRightOperand + ")";
return(str);
}