Also on a separate note, what does it mean for

#...

to not affect the semantics of a tuple, e.g. given

folder:A#...

, is this like a wildcard?

no, it's just the notation to "self". If you think about a graph, it would be like pointing to a node. Zanzibar allows you to point to both edges and nodes.

so in this case, relations are akin to edges, and subjects(users) and resources are nodes?

correct