referredGraphs.addAll(dataSet.getNamedGraphs());
} else {
referredGraphs = new HashSet<UriRef>();
}
} else {
Update u = sparqlUnit.getUpdate();
referredGraphs = u.getReferredGraphs(defaultGraph, tcProvider);
}
if (referredGraphs.isEmpty()) {
return null;
// referredGraphs.add(defaultGraph);
}