/** Removes the triple t (if possible) from the set belonging to this graph. */
public void performDelete(Triple t) {
version++;
if (!isPrepared) prepare();
fdata.getGraph().delete(t);
}
/**
* Add one triple to the data graph, run any rules triggered by the new data item, recursively
* adding any generated triples.
*/
public synchronized void performAdd(Triple t) {
version++;
if (!isPrepared) prepare();
// System.out.println(t.toString());
fdata.getGraph().add(t);
}