Radio/radiogroup relationship

[giacomo-petri]

I know we had a long discussion about this, but I can't remember where we landed on this point. We moved from "Required Owned Elements / Required Context Role" to "Allowed Accessibility Child Roles / Required Accessibility Parent Roles".

But now we have no way to enforce that a radiogroup must contain at least one radio. A radiogroup can include any element (which prevents us from listing radio as an "Allowed Accessibility Child Role") and similarly, a radiogroup isn't always required to be the container of radios, so "Required Accessibility Parent Roles" can't be applied either. Yet, a radiogroup without any radio elements doesn't make sense, does it?

Shouldn't we also have something like "Required Accessibility Child Roles"?