A Sail which maps between the internal URI space of a lower-level data store, and an externally visible URI space
(for example, published Linked Data).
A set of rules for rewriting URIs based on direction (to or from the data store) and part of speech (the position
in an RDF statement in which a URI appears)
The direction of a URI rewriting rule: inbound rules map externally visible URIs to the URIs found in the data store,
while outbound rules do the opposite.