# File lib/numru/nusdas.rb, line 169
    def initialize(path)
      unless NuSDaS.is_a_NuSDaS?(path)
        raise "path must be NuSDaS root directory"
      end
      @root = path
      @meta = Hash.new
      unless search_dir(path)
        raise "No NuSDas files are found"
      end
    end