this.federation = federation;
BNodeFactoryImpl bf = new BNodeFactoryImpl();
URIFactory uf = federation.getURIFactory();
LiteralFactory lf = federation.getLiteralFactory();
vf = new ValueFactoryImpl(bf, uf, lf);
this.members = new ArrayList<SignedConnection>(members.size());
for (RepositoryConnection member : members) {
BNodeSigner signer = new BNodeSigner(bf, member.getValueFactory());
this.members.add(signer.sign(member));