Parse an entity address URI into its model URI and express ID.
The split is on the last#, so a fragment is required; the model URI
is everything before it. A missing or non-integer fragment is an error —
an address without an express ID isn't an entity address.
Parse an entity address URI into its model URI and express ID.
The split is on the last
#, so a fragment is required; the model URI is everything before it. A missing or non-integer fragment is an error — an address without an express ID isn't an entity address.