marklogic-jena/src/main/java/com/marklogic/semantics/jena/MarkLogicDatasetGraph.java
@Override
    protected void addToDftGraph(Node s, Node p, Node o) {
        checkIsOpen();
        Node s1 = skolemize(s);
        Node p1 = skolemize(p);
        Node o1 = skolemize(o);
        client.sinkQuad(null, s1, p1, o1);
    }
@Override
    protected void addToDftGraph(Node s, Node p, Node o) {
        checkIsOpen();
        Node s1 = skolemize(s);
        Node p1 = skolemize(p);
        Node o1 = skolemize(o);
        client.sinkQuad(null, s1, p1, o1);
    }
/*
@see org.apache.jena.sparql.core.DatasetGraphTriplesQuads Internally uses
a write cache to hold batches of quad updates. @see sync()