SYSML17 — is the stereotype <<~InterfaceBlock>>

is the stereotype on a conjugate block <<~InterfaceBlock>> or <<InterfaceBlock>> not specified in the Standard and very confusing from what information is given in the standard

I find the whole thing wrong... one should have a stereotype <<InterfaceBlock>> that has the attribute original in it... and remove <<~InterfaceBlock>> ... it works just the same without the confusion... one would need to make original [0..1]... or better yet, one could say that every InterfaceBlock must have an implicitly (possibly created by tool) or explicitly created by the modeler conjugate InterfaceBlock which is in the Model

one could instead add in the stereotype <<conjugates>> which keeps that information as well... but then there needs to be a constraint in the standard that keeps conjugates and original in sync.. but this would be acceptable to be able to show this in a model

by the way, there are places in the standard (examples) where it is not original as the attribute