dd class="cmt"><p>Dataset of triples</p></dd><dt class="param">subject</dt><dd class="cmt"><p>the subject (None for any)</p></dd><dt class="param">predicate</dt><dd class="cmt"><p>the predicate (None for any)</p></dd><dt class="param">object</dt><dd class="cmt"><p>the object (None for any)</p></dd><dt>returns</dt><dd class="cmt"><p>true if there exists within this RDF graph
a triple with (S, P, O) pattern, false otherwise</p></dd></dl></div>
    </li><li name="net.sansa_stack.rdf.spark.model.ds.TripleOps#co