Ripple does not currently support N3's @base directive. This might be useful.
From the spec:
The @base directive sets the base URI to be used for the parsing of
relative URIs. It takes, itself, a relative URI, so it can be used to
change the base URI relative to the previous one.
Example
@base <http://example.org/products/>.
...
@base <prod123/>.
...
@base <../>.
Original link: http://code.google.com/p/ripple/issues/detail?id=25