Standard Definitions

Standard definitions are Standards that serve as enumerations. You can define a Standard definition for an object or variable where it may be represented as a single value.

    
    color: CLR {
        def red "RED"
        def orange "ORANGE"
        def yellow "YELLOW"
        def green "GREEN"
        def blue "BLUE"
        def indigo "INDIGO"
        def violet "VIOLET"
    }
    

Standard definitions are used by referencing them as a constraint in another Standard. A Standard representing a vehicle may have the color Standard definition to define the vehicle color like so.

    
    vehicle: VHL {
        private vin string VN *
        protected make string MK *
        protected model string MDL *
        protected type standard @CLR clr
    }
    

Now when a value is passed to the vehicle Standard for the color constraint, it must match one of the values defined in the color Standard definition.

Creating with Definitions

When using a creation query and Standard definitions, you can use the values verbatim or reference the Standard. You reference Standard definitions in any type of query like this:

    
    #Create red vehicles
    [vehicle] + ("VIN173", "Dodge", "Durango", red)
    [vehicle] + ("VIN453", "Dodge", "Durango", "RED")
    [vehicle] + ("VIN189", "Dodge", "Durango", @CLR.red)

    #Delete red vehicles
    [vehicle] - <color CLR.red>
    [vehicle] - <color "RED">
    [vehicle] - <color red>

    #Find 5 red vehicles
    [vehicle] <color @CLR.red, LIMIT 5>