public interface GetTriple
this interface describes types that can have a triple extracted using a
getTriplemethod. It was constructed so that Node's can have possibly embedded triples but defer to a GetTriple object if they have no triple of their own; the particular GetTriple used initially is in Reifier, but that seemed excessively special.
getTripleAnswer the triple associated with the node
n- the node to use as the key
- the associated triple, or