Review. Error - Section 9.3 Missing BASE?

Review of http://www.w3.org/2001/sw/DataAccess/rq23/ v1.379

9.3 has

PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX dc: <http://purl.org/dc/elements/1.1/>

SELECT ?who ?g ?mbox
FROM <dft.ttl>
FROM NAMED <http://example.org/alice>
FROM NAMED <http://example.org/bob>
WHERE
{
   ?g dc:publisher ?who .
   GRAPH ?g { ?x foaf:mbox ?mbox }
}

How is <dft.ttl> intended to be interpreted? Is there an implicit BASE if
none is given? If so it should be stated in 2.1 or if its a special case,
in 9.3.

- Steve