docs: protected IStyleAppendable appendCluster(IStyleAppendable it, boolean addNewLine, String element0, String... elements) {
  		it.append("syn cluster "); //$NON-NLS-1$
  		it.append(getLanguageSimpleName().toLowerCase());
  		it.append("Top add="); //$NON-NLS-1$
  		it.append(element0);
  		for (final String element : elements) {
  			it.append(","); //$NON-NLS-1$
  			it.append(element);
  		}
  		if (addNewLine) {
  			it.newLine();
  		}
  		return it;
  	}