# File lib/rgen/fragment/dump_file_cache.rb, line 40
  def load(fragment)
    dump = @cache_map.load_data(fragment.location)
    return :invalid if dump == :invalid
    header = Marshal.load(dump)
    fragment.set_root_elements(header[:root_elements],
      :elements => header[:elements],
      :index => header[:index],
      :unresolved_refs => header[:unresolved_refs])
    fragment.data = header[:data]
    if header[:fragment_ref]
      fragment.fragment_ref = header[:fragment_ref]
      fragment.fragment_ref.fragment = fragment
    else
      raise "no fragment_ref in fragment loaded from cache"
    end
  end