code: public PathImpl fsWalk(String userPath,
                          Map<String,Object> attributes,
                          String path)
    {
      return new ClasspathPath(_root, userPath, path);
    }
docs: Lookup the actual path relative to the filesystem root.
  
  @param userPath the user's path to lookup()
  @param attributes the user's attributes to lookup()
  @param path the normalized path
  
  @return the selected path