Re: firts and rdf:rest as functional property

RDF "lists" are co-lists in the co-algebraic sense [1].
You can *observe* the head and *observe* the tail, which may be empty. Each
observation corresponds to a query.
This eliminates the need to worry about the structure of the list in
whatever store you might be using.
Ross
[1] http://eprints.kfupm.edu.sa/21860/