// -- Convenience static methods -----------------------
public static void output(UpdateRequest request, IndentedWriter out)
{
Prologue prologue = request ;
if ( ! request.explicitlySetBaseURI() )
prologue = new Prologue(request.getPrefixMapping(), (IRIResolver)null) ;
SerializationContext sCxt = new SerializationContext(prologue, new NodeToLabelMapBNode()) ;
output(request, out, sCxt);
}