Hmm, just another thought/question -> Is there a way to think about "subscribing" to changes relevant to a specific identity? eg, could I make a feed of changes that affect a specific Principle? or... Even like the current "Document ID" a User is currently on? eg... "Watch" in the zanzibar paper, but... "scoped" for things relvant to the current user or the "objects" on their page? Hrm.. you'd need to like Expand Gorups or other relationship mechinisms.