Depending on the outcome of the ensuing discussion here, it looks like I will be updating FEP 11dd: Context Ownership and Inheritance away from:
> The object SHOULD inherit a context other than its own. It is RECOMMENDED that the object inherit the context of the object it is in reply to. Doing so will allow for all members of a context collection (per FEP f228) to refer to the same context.
>
> The object MAY inherit context further up the chain.
to
> The object MUST inherit the context from the root node, if one is reported. Otherwise the object MUST NOT publish a context. Doing so will allow for all members of a context collection (per FEP f228) to refer to the same context.
>
> Implementors SHOULD map that inherited context to a local identifier (if applicable) to support future use-cases/activities.