code: public void append(StringConcatenationClient client) {
  		if (client != null)
  			client.appendTo(new SimpleTarget(this, segments.size()));
  	}
docs: Append the contents of a given StringConcatenationClient to this sequence. Does nothing
  if the argument is <code>null</code>.
  
  @param client
  the to-be-appended StringConcatenationClient.
  @since 2.11