code: public static TileRef imports(Xml nodeTile)
      {
          Check.notNull(nodeTile);
  
          final int sheet = nodeTile.readInteger(ATT_TILE_SHEET);
          final int number = nodeTile.readInteger(ATT_TILE_NUMBER);
  
          return new TileRef(sheet, number);
      }
docs: Create the tile data from node.
  
  @param nodeTile The node reference (must not be <code>null</code>).
  @return The tile data.
  @throws LionEngineException If <code>null</code> argument or error when reading.