Define behaviour for pending notifications when deleting a subscription
In TS-0004, clause "7.4.8.2.3 Update", Recv-6.5. point 4), it is defined that when removing the pendingNotification attribute is removed then all pending notifications are removed as well.
However, there is nothing in clause "7.4.8.2.4 Delete" to reflect this behaviour when deleting a <subscription> resource.
Proposal
Add a new sentence to clause 7.4.8.2.4:
All cached pending Notify request primitives for the subscription resource shall be removed