* '''==== Value type operand''': ====Are numeric values of the float type (Real numbers domain). These values allow the use of a integer and a fraction part, separated by the dot (.) character (decimal separator).
'''Examples''': 1, 1.05, 2.55;
* '''==== Text type operand''': ====Are literal string data operands. These values allow the use of characters chain fields (strings), being delimited by the simple quote (') character.
'''Examples''': 'John Snow', 'California', 'Spaghetti';
* '''==== Date type operand''': ====Are values that express any date. It is possible to determine a date representing it as a string, being delimited by the simple quote (') character and separated by the bar (/) character. The default supported format is "dd/MM/yyyy".
'''Examples''': '01/01/2011', '29/02/2000';
* '''==== Boolean type operand''': ====Are values from the ''true'' or ''false'' kind. Usually used to validate or not a condition.
'''Examples''': true e false;
* '''==== Identifier type operand''': ====Are values that represents a field or variable in the expression. Used to make reference to data source columns, delimited by double quotes (").
'''Examples''': "City.City", "Product.Product";
* ==== Parenthesis ====Use to group part of expressions. '''Examples''': ("Profit" / "Total Price" ) + 10 ==== System variable type operand''': ====Are system pre-defined variables. These values are replaced in run-time by pre-determined values, delimited by double quotes (") and preceded by star (#). By now only one variable is available: "#null" that indicates null values or fields.
