[sv-bc] question about new enum types in standard package

SV-BC,

In sv-ac, we are discussing about adding new system tasks which would have difference arguments. Here is an example:

$assertcontrol(level, control_type, directive_type, ...);

Here control_type can be either on/off/kill. Similarly directive_type can be assert, cover or assume. We want to define some enums to represent these values so that users do not need to pass integer values. Instead the users can use one of these enums (or even pass OR of multiple of them).

Is there a precedent for such a thing ? Is standard package defined in Annex G right place to insert these new enum types ?

Thanks.
Manisha

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