Today tags are very important but also very open for any value. There is no option to limit or control what users can define as value.

I would like to propose an enhancement request to implement a TAG validation, for scenarios presented below.

• Parameter validation or input validation → checking that the value passed into a TAG meets certain rules.
  • Example: AGE not lower than 0 and not bigger than 120.
• Domain restriction → ensuring the parameter belongs to a defined set of acceptable values.
  • Example: Weekdays in {"Monday", "Tuesday", "Wednesday", "Thursday", "Friday"}
• Enumeration (enum) → using a type that explicitly lists the only allowed values.
  • Example: Color: red as 1, green as 2, blue as 3
• Whitelist validation → allowing only values from a predefined list, rejecting everything else.
  • Example: Country: only predefined will be allowed
• Constraint checking → applying rules (constraints) to limit what values are valid.
  • Example: Time: not older than current time or size limited to 3 characters + 2 numbers or not empty.