public void removeListener(final ISPARQLUpdateListener l){
  if (isReadOnly())   throw new UnsupportedOperationException();
  if (l == null)   throw new IllegalArgumentException();
  listeners.remove(l);
}

public void removeListener ( final ISPARQLUpdateListener l ) { if ( isReadOnly ( ) ) throw new UnsupportedOperationException ( ) ; if ( l == null ) throw new IllegalArgumentException ( ) ; listeners . remove ( l ) ; }
remove a sparql udpate listener .
