Create a new blank node in the graph and return it.
If you provide an RDF type and that type is registered with the EasyRdf_TypeMapper, then the resource will be an instance of the class registered.
mixed $types RDF type of a new blank node (e.g. foaf:Person):
object EasyRdf_Resource The new blank node
public function newBNode($types = array()) {
return $this
->resource($this
->newBNodeId(), $types);
}