code: private static void exportTiles(Xml nodeTransition, Collection<TileRef> tilesRef)
      {
          for (final TileRef tileRef : tilesRef)
          {
              final Xml nodeTileRef = TileConfig.exports(tileRef);
              nodeTransition.add(nodeTileRef);
          }
      }
docs: Export all tiles for the transition.
  
  @param nodeTransition The transition node (must not be <code>null</code>).
  @param tilesRef The transition tiles ref (must not be <code>null</code>).