N3Store.exractLists() too restrictive

[s-tittel]

Currently, N3 assumes that RDF lists consist of quads having a predicate of rdf:first or rdf:rest only. Is there any reason for this?

I would expect this example to be valid, but N3 declares it as malformed with the error http://example.org/1 can't be subject and object:

@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix : <http://example.org/> .

:alice foaf:name  "Alice" .
:bob   foaf:name  "Bob" .
:cal   foaf:knows :1 .

:1 rdf:first :alice ; rdf:rest :2 .
:2 rdf:first :bob   ; rdf:rest rdf:nil .

# as soon as we add other triples to the list, it is declared as malformed
:1 a rdf:List .

See e.g. this ontology for a real world example that we would like to use together with N3.