Subscription request format - last box related to websockets - "Required when hub.channel.type=websocket for re-subscribes and unsubscribes." is a duplication of the column that states it is conditional for webscockets. The sentence on its own is not wrong - remove it or make it an issue for STU3.

Comment Isaac.Vetter :

Will you please log this as a jira issue? I'm likely misunderstanding, because I'm uncertain you're right. Note that not only is hub.channel.type required for websockets and not for webhooks, but more specifically is not required for initial subscribes when using websockets. Elsewhere, when we use CONDITIONAL, it typically means that websockets always requires and webhooks doesn't or vice-versa.

 See also https://github.com/HL7/fhircast-docs/pull/353