code: @Override
      public void doAction(Bundle bu, ProvUtilities u) {
  	register(bu.getId());
  	for (Statement s2: bu.getStatement()) {
  	    u.doAction(s2, this);
  	}
      }
docs: /* Note how the same NamespaceGatherer is kept, and namespaces are not registered at their local bundle.
  (non-Javadoc)
  @see org.openprovenance.prov.model.StatementAction#doAction(org.openprovenance.prov.model.NamedBundle, org.openprovenance.prov.model.ProvUtilities)