PROV in the Semantic Web Layer Cake?

Hi Folks,

Not sure if this topic has come up before - but a quick search on the email
archives and I don't see it.

Semantic Web Layer Cake:
en.wikipedia.org/wiki/Semantic_Web_Stack

The illustration most of us are familiar with was created by Tim
Berners-Lee and is still evolving.

I wonder if we can update the illustration to work the PROV spec into the
Trust and/or Proof layer?  In the same way that other layers have the same
syntax ":<spec>"

-Craig